Basis of design and numerical modeling of offshore wind turbinesFranco Bontempi
Offshore wind turbines are relatively complex structural and mechanical systems located in a
highly demanding environment. In the present paper the fundamental aspects and the major issues related
to the design of these special structures are outlined. Particularly, a systemic approach is proposed for a
global design of such structures, in order to handle coherently their different parts: the decomposition of
these structural systems, the required performance and the acting loads are all considered under this
philosophy. According to this strategy, a proper numerical modeling requires the adoption of a suitable
technique in order to organize the qualitative and quantitative assessments in various sub-problems, which
can be solved by means of sub-models at different levels of detail, for both structural behavior and loads
simulation. Specifically, numerical models are developed to assess the safety performances under
aerodynamic and hydrodynamic actions. In order to face the problems of the actual design of a wind farm
in the Mediterranean Sea, in this paper, three schemes of turbines support structures have been considered
and compared: the mono pile, the tripod and the jacket support structure typologies.
Structural Design and Analysis of Offshore Wind Turbines from a System Point...Franco Bontempi
Offshore wind turbines are relatively complex structural and mechanical systems located in
a highly demanding environment. In this study, the fundamental aspects and major issues
related to the design of such structures are inquired. The system approach is proposed to
carry out the design of the structural parts: in accordance with this philosophy, a
decomposition of the system (environment, structure, actions/loads) and of the structural
performance is carried out, in order to organize the qualitative and quantitative assessment
in various sub-problems. These can be faced by sub-models of different complexity both for
the structural behavior and for the load models. Numerical models are developed to assess
the safety performance under aerodynamic and hydrodynamic actions. In the structural
analyses, three types of turbine support structures have been considered and compared: a
monopile, a tripod and a jacket.
Dynamic Analysis of an Offshore Wind Turbine: Wind-Waves Nonlinear InteractionFranco Bontempi
An offshore wind turbine can be considered as a relatively complex structural system
since several environmental factors (e.g. wind and waves) affect its dynamic
behavior by generating both an active load and a resistant force to the structure’s
deformation induced by simultaneous actions. Besides the stochastic nature, also
their mutual interaction should be considered as nonlinear phenomena could be
crucial for optimal and cost-effective design. Another element of complexity lies in
the presence of different parts, each one with its peculiar features, whose mutual
interaction determines the overall dynamic response to non-stationary environmental
and service loads. These are the reasons why a proper and safe approach to the
analysis and design of offshore wind turbines requires a suitable technique for
carrying out a structural and performances decomposition along with the adoption of
advanced computation tools. In this work a finite element model for coupled windwaves
analysis is presented and the results of the dynamic behavior of a monopiletype
support structure for offshore wind turbine are shown.
Advanced Topics in Offshore Wind Turbines DesignFranco Bontempi
Offshore Wind Turbine (OWT) is a relatively complex structural and mechanical
system located in a highly demanding environment. In this study the fundamental
aspects and the major issues related to the design of such structures are inquired. The
System Approach is proposed to carry out the design of the structural parts: in
accordance with this philosophy, decomposition of the system (environment,
structure, actions/loads) and of the structural performance is carried out in order to
organize the qualitative and quantitative assessments in various sub-problems. These
aspects can be faced by sub-models of different involvedness both for the structural
behavior and for the load models. Numerical models are developed accordingly to
assess safety, performance and robustness under aerodynamic and hydrodynamic
actions.
Multi-level structural modeling of an offshore wind turbineFranco Bontempi
Offshore wind turbines are complex structural and mechanical systems located in a highly
demanding environment. This paper proposes a multi-level system approach for studying the structural
behavior of the support structure of an offshore wind turbine. In accordance with this approach, a proper
numerical modeling requires the adoption of a suitable technique in order to organize the qualitative and
quantitative assessment in various sub-problems, which can be solved by means of sub-models at different
levels of detail, both for the structural behavior and for the simulation of loads. Consequently, in a first
place, the effects on the structural response induced by the uncertainty of the parameters used to describe
the environmental actions and the finite element model of the structure are inquired. After that, a mesolevel
FEM model of the blade is adopted in order to obtain the detailed load stress on the blade/hub
connection.
Flow-induced energy harvesting: conceptual design and numerical analyses of ...StroNGER2012
This study focuses on the conceptual design and the numerical analysis of an Energy Harvesting (EH) device, based on piezoelectric materials, for the sustainability of smart buildings. Before that, a comprehensive literature review on the topic takes place. The device consists in an aerodynamic fin attached to a piezoelectric element that makes use of the airflow to harvest energy. The principal utilization of this device is for energy autonomous sensors, with applications in smart buildings. A performance-based parametric analysis is conducted (in ANSYS®) in order to assess the optimal values of some design and operating condition parameters, including length, width, thickness, constitutive material of the bender and velocity and turbulence intensity of the incoming airflow. The response parameters used for evaluating the performances include the bender maximum tip displacement, the bender vibration frequency, and the rms of the voltage generated by the device. Considerations are made on possible applications in other sectors (structures and transportations infrastructures).
Basis of Design of Offshore Wind Turbines by System DecompositionFranco Bontempi
ABSTRACT
Offshore wind turbines are relatively complex structural and mechanical systems located in a highly demanding environment. Boundary conditions are intrinsically time-variable and space-dependent, both as loads and as constraints. Furthermore, different structural configurations must be handled: in fact, one has to pass from complete functionality to rotor stop. In consideration to the fact that in Italy, the construction of offshore wind farms for power production is currently under consideration, the aim of this paper is to corroborate the basis of design of offshore wind turbines, as a support to the decision making, having as a specific objective the structural design of the structure. In doing so, a systemic decomposition of the
relevant elements, both physical related (e.g. the constituting parts) and due to the external conditions (that lead to the identification of the structural loads) is performed. A necessary
reference to the Codes and Standards is coherently given, to develop a sound basis of design.
The 4th International Conference on
Advances in Structural Engineering and Mechanics (ASEM'08)
Jeju, Korea, May 26-28, 2008
Structural morphology optimization by evolutionary proceduresStroNGER2012
The paper deals with the identification of optimal structural morphologies through evolutionary procedures.
Two main approaches are considered. The first one simulates the Biological Growth (BG) of natural structures like the bones and the trees. The second one, called Evolutionary Structural Optimization (ESO), removes material at low stress level. Optimal configurations are addressed by proper optimality indexes and by a monitoring of the structural response. Design graphs suitable to this purpose are introduced and employed in the optimization of a pylon carrying a suspended roof and of a bridge under multiple loads.
Basis of design and numerical modeling of offshore wind turbinesFranco Bontempi
Offshore wind turbines are relatively complex structural and mechanical systems located in a
highly demanding environment. In the present paper the fundamental aspects and the major issues related
to the design of these special structures are outlined. Particularly, a systemic approach is proposed for a
global design of such structures, in order to handle coherently their different parts: the decomposition of
these structural systems, the required performance and the acting loads are all considered under this
philosophy. According to this strategy, a proper numerical modeling requires the adoption of a suitable
technique in order to organize the qualitative and quantitative assessments in various sub-problems, which
can be solved by means of sub-models at different levels of detail, for both structural behavior and loads
simulation. Specifically, numerical models are developed to assess the safety performances under
aerodynamic and hydrodynamic actions. In order to face the problems of the actual design of a wind farm
in the Mediterranean Sea, in this paper, three schemes of turbines support structures have been considered
and compared: the mono pile, the tripod and the jacket support structure typologies.
Structural Design and Analysis of Offshore Wind Turbines from a System Point...Franco Bontempi
Offshore wind turbines are relatively complex structural and mechanical systems located in
a highly demanding environment. In this study, the fundamental aspects and major issues
related to the design of such structures are inquired. The system approach is proposed to
carry out the design of the structural parts: in accordance with this philosophy, a
decomposition of the system (environment, structure, actions/loads) and of the structural
performance is carried out, in order to organize the qualitative and quantitative assessment
in various sub-problems. These can be faced by sub-models of different complexity both for
the structural behavior and for the load models. Numerical models are developed to assess
the safety performance under aerodynamic and hydrodynamic actions. In the structural
analyses, three types of turbine support structures have been considered and compared: a
monopile, a tripod and a jacket.
Dynamic Analysis of an Offshore Wind Turbine: Wind-Waves Nonlinear InteractionFranco Bontempi
An offshore wind turbine can be considered as a relatively complex structural system
since several environmental factors (e.g. wind and waves) affect its dynamic
behavior by generating both an active load and a resistant force to the structure’s
deformation induced by simultaneous actions. Besides the stochastic nature, also
their mutual interaction should be considered as nonlinear phenomena could be
crucial for optimal and cost-effective design. Another element of complexity lies in
the presence of different parts, each one with its peculiar features, whose mutual
interaction determines the overall dynamic response to non-stationary environmental
and service loads. These are the reasons why a proper and safe approach to the
analysis and design of offshore wind turbines requires a suitable technique for
carrying out a structural and performances decomposition along with the adoption of
advanced computation tools. In this work a finite element model for coupled windwaves
analysis is presented and the results of the dynamic behavior of a monopiletype
support structure for offshore wind turbine are shown.
Advanced Topics in Offshore Wind Turbines DesignFranco Bontempi
Offshore Wind Turbine (OWT) is a relatively complex structural and mechanical
system located in a highly demanding environment. In this study the fundamental
aspects and the major issues related to the design of such structures are inquired. The
System Approach is proposed to carry out the design of the structural parts: in
accordance with this philosophy, decomposition of the system (environment,
structure, actions/loads) and of the structural performance is carried out in order to
organize the qualitative and quantitative assessments in various sub-problems. These
aspects can be faced by sub-models of different involvedness both for the structural
behavior and for the load models. Numerical models are developed accordingly to
assess safety, performance and robustness under aerodynamic and hydrodynamic
actions.
Multi-level structural modeling of an offshore wind turbineFranco Bontempi
Offshore wind turbines are complex structural and mechanical systems located in a highly
demanding environment. This paper proposes a multi-level system approach for studying the structural
behavior of the support structure of an offshore wind turbine. In accordance with this approach, a proper
numerical modeling requires the adoption of a suitable technique in order to organize the qualitative and
quantitative assessment in various sub-problems, which can be solved by means of sub-models at different
levels of detail, both for the structural behavior and for the simulation of loads. Consequently, in a first
place, the effects on the structural response induced by the uncertainty of the parameters used to describe
the environmental actions and the finite element model of the structure are inquired. After that, a mesolevel
FEM model of the blade is adopted in order to obtain the detailed load stress on the blade/hub
connection.
Flow-induced energy harvesting: conceptual design and numerical analyses of ...StroNGER2012
This study focuses on the conceptual design and the numerical analysis of an Energy Harvesting (EH) device, based on piezoelectric materials, for the sustainability of smart buildings. Before that, a comprehensive literature review on the topic takes place. The device consists in an aerodynamic fin attached to a piezoelectric element that makes use of the airflow to harvest energy. The principal utilization of this device is for energy autonomous sensors, with applications in smart buildings. A performance-based parametric analysis is conducted (in ANSYS®) in order to assess the optimal values of some design and operating condition parameters, including length, width, thickness, constitutive material of the bender and velocity and turbulence intensity of the incoming airflow. The response parameters used for evaluating the performances include the bender maximum tip displacement, the bender vibration frequency, and the rms of the voltage generated by the device. Considerations are made on possible applications in other sectors (structures and transportations infrastructures).
Basis of Design of Offshore Wind Turbines by System DecompositionFranco Bontempi
ABSTRACT
Offshore wind turbines are relatively complex structural and mechanical systems located in a highly demanding environment. Boundary conditions are intrinsically time-variable and space-dependent, both as loads and as constraints. Furthermore, different structural configurations must be handled: in fact, one has to pass from complete functionality to rotor stop. In consideration to the fact that in Italy, the construction of offshore wind farms for power production is currently under consideration, the aim of this paper is to corroborate the basis of design of offshore wind turbines, as a support to the decision making, having as a specific objective the structural design of the structure. In doing so, a systemic decomposition of the
relevant elements, both physical related (e.g. the constituting parts) and due to the external conditions (that lead to the identification of the structural loads) is performed. A necessary
reference to the Codes and Standards is coherently given, to develop a sound basis of design.
The 4th International Conference on
Advances in Structural Engineering and Mechanics (ASEM'08)
Jeju, Korea, May 26-28, 2008
Structural morphology optimization by evolutionary proceduresStroNGER2012
The paper deals with the identification of optimal structural morphologies through evolutionary procedures.
Two main approaches are considered. The first one simulates the Biological Growth (BG) of natural structures like the bones and the trees. The second one, called Evolutionary Structural Optimization (ESO), removes material at low stress level. Optimal configurations are addressed by proper optimality indexes and by a monitoring of the structural response. Design graphs suitable to this purpose are introduced and employed in the optimization of a pylon carrying a suspended roof and of a bridge under multiple loads.
During the last decades, several studies on suspension bridges under wind actions have been developed in civil engineering and many techniques have been used to approach this structural problem both in time and frequency domain. In this paper, four types of time domain techniques to evaluate the response and the stability of a long span suspension bridge are implemented: nonaeroelastic, steady, quasi steady, modified quasi steady. These techniques are compared considering both nonturbulent and turbulent flow wind modelling. The results show consistent differences both in the amplitude of the response and in the value of critical wind velocity.
VARIATION OF SEISMIC RESPONSE OF MID-RISE RC BUILDINGS DUE TO SOIL STRUCTURE ...IAEME Publication
The seismic design of RC buildings requires determining the expected base shear, lateral drift at each story level and internal forces of the structural elements. In the analysis, it is common for the structural engineers to consider a fixed base structure which means that the foundations and the underlying soil are assumed to be infinitely rigid. This assumption is not proper since the underlying soil in the near field often consists of soft soil layers that possess different properties and may behave nonlinearly leading to drastic variation of the seismic motion before hitting the structure foundation. In addition, the mutual interaction between the structure, its foundation and the underlying soil during the vibrations can substantially alter the structure response. This response variation depends on the structure characteristics, the soil properties and the nature of the seismic excitation. Consequently, an accurate assessment of inertial forces and displacements in structures requires a rational treatment of soil structure interaction (SSI) effects.
Dynamic Analysis of Multi-Storeyed Frame-Shear Wall Building Considering SSIIJERA Editor
The structural system of a high-rise building often has a more pronounced effect than a low rise building on the
total building cost and the architecture aspect of building. Shear walls are lateral load resisting structural
systems which provide stability to structures from lateral loads like wind and seismic Loads. The design of multi
storey building is to have good lateral load resisting System along with gravity load system for safety of
occupant and for better performance of structure even in most adverse condition. The main scope of this project
is to apply class room knowledge in the real world by designing a multi-storied residential building. Shear walls
are more efficient in resisting lateral loads in multi storied buildings. Steel and reinforced concrete shear walls
are kept in major positions of multi storied buildings which are made in consideration of seismic forces and
wind forces. To solve this purpose shear walls are a very powerful structural elements, if used judiciously can
reduce deflections and stresses to a very great extent. Our project contains a brief description of building with
shear wall and without shear wall thoroughly discussed structural analysis of a building to explain the
application of shear wall. The design analysis of the multi storied building in our project is done through
STAAD-PRO, most popular structural engineering software. It is featured with some ultimate power tool,
analysis and design facilities which make it more users friendly.
Static Aeroelasticity Analysis of Spinning Rocket for Divergence Speed -- Zeu...Abhishek Jain
Above Research Paper can be downloaded from www.zeusnumerix.com
The research paper aims to develop a method to model the spin effects of rocket for Aeroelastic analysis. As the speed of the rocket increases, the structural integrity of the fins becomes more dependent on aeroelastic loads. Methods exist to analyze aeroelasticity of fins for non-spinning missiles. Most software use panel methods for calculation of load distribution. The current research replaces the panel methods to RANS CFD and introduces source terms in equations to model spin. The results of new formulation are validated w.r.t. published data on non-spinning projectile and then the method is used to simulate current projectile. Mode shapes up to 6th mode are delivered as result. Authors - Sanjay Kumar and Prof GR Shevare (Zeus Numerix), Subhash Mukane and PT Rojatkar (ARDE, DRDO)
Symposium 7: Advanced Topics in Offshore Wind Turbine Research.
Today, there is a world strong attention to energy resources and global sustainability: Offshore Wind
Turbines (OWT) play a special role and have reacheda main consensus about effectiveness. The Symposium concerns all the aspects related with these complex challenging structural systems, covering both design concepts and analysis methods,with special attention to interaction phenomena and multidisciplinary problems, and a strong focus on demanding technological characteristics,
experimental activities and real applications.
ASCE Earth & Space 2010 OWT Symposium
http://content.asce.org/files/pdf/EarthSpace2010Prelim-FINAL.pdf
http://ascelibrary.org/doi/book/10.1061/9780784410967
Lezione del 12 ottobre 2016 al Corso di Progettazione Strutturale Antincendio,
Prof. Ing. Franco Bontempi
Facolta' di Ingegneria Civile e Industriale
Universita' degli Studi di Roma La Sapienza
During the last decades, several studies on suspension bridges under wind actions have been developed in civil engineering and many techniques have been used to approach this structural problem both in time and frequency domain. In this paper, four types of time domain techniques to evaluate the response and the stability of a long span suspension bridge are implemented: nonaeroelastic, steady, quasi steady, modified quasi steady. These techniques are compared considering both nonturbulent and turbulent flow wind modelling. The results show consistent differences both in the amplitude of the response and in the value of critical wind velocity.
VARIATION OF SEISMIC RESPONSE OF MID-RISE RC BUILDINGS DUE TO SOIL STRUCTURE ...IAEME Publication
The seismic design of RC buildings requires determining the expected base shear, lateral drift at each story level and internal forces of the structural elements. In the analysis, it is common for the structural engineers to consider a fixed base structure which means that the foundations and the underlying soil are assumed to be infinitely rigid. This assumption is not proper since the underlying soil in the near field often consists of soft soil layers that possess different properties and may behave nonlinearly leading to drastic variation of the seismic motion before hitting the structure foundation. In addition, the mutual interaction between the structure, its foundation and the underlying soil during the vibrations can substantially alter the structure response. This response variation depends on the structure characteristics, the soil properties and the nature of the seismic excitation. Consequently, an accurate assessment of inertial forces and displacements in structures requires a rational treatment of soil structure interaction (SSI) effects.
Dynamic Analysis of Multi-Storeyed Frame-Shear Wall Building Considering SSIIJERA Editor
The structural system of a high-rise building often has a more pronounced effect than a low rise building on the
total building cost and the architecture aspect of building. Shear walls are lateral load resisting structural
systems which provide stability to structures from lateral loads like wind and seismic Loads. The design of multi
storey building is to have good lateral load resisting System along with gravity load system for safety of
occupant and for better performance of structure even in most adverse condition. The main scope of this project
is to apply class room knowledge in the real world by designing a multi-storied residential building. Shear walls
are more efficient in resisting lateral loads in multi storied buildings. Steel and reinforced concrete shear walls
are kept in major positions of multi storied buildings which are made in consideration of seismic forces and
wind forces. To solve this purpose shear walls are a very powerful structural elements, if used judiciously can
reduce deflections and stresses to a very great extent. Our project contains a brief description of building with
shear wall and without shear wall thoroughly discussed structural analysis of a building to explain the
application of shear wall. The design analysis of the multi storied building in our project is done through
STAAD-PRO, most popular structural engineering software. It is featured with some ultimate power tool,
analysis and design facilities which make it more users friendly.
Static Aeroelasticity Analysis of Spinning Rocket for Divergence Speed -- Zeu...Abhishek Jain
Above Research Paper can be downloaded from www.zeusnumerix.com
The research paper aims to develop a method to model the spin effects of rocket for Aeroelastic analysis. As the speed of the rocket increases, the structural integrity of the fins becomes more dependent on aeroelastic loads. Methods exist to analyze aeroelasticity of fins for non-spinning missiles. Most software use panel methods for calculation of load distribution. The current research replaces the panel methods to RANS CFD and introduces source terms in equations to model spin. The results of new formulation are validated w.r.t. published data on non-spinning projectile and then the method is used to simulate current projectile. Mode shapes up to 6th mode are delivered as result. Authors - Sanjay Kumar and Prof GR Shevare (Zeus Numerix), Subhash Mukane and PT Rojatkar (ARDE, DRDO)
Symposium 7: Advanced Topics in Offshore Wind Turbine Research.
Today, there is a world strong attention to energy resources and global sustainability: Offshore Wind
Turbines (OWT) play a special role and have reacheda main consensus about effectiveness. The Symposium concerns all the aspects related with these complex challenging structural systems, covering both design concepts and analysis methods,with special attention to interaction phenomena and multidisciplinary problems, and a strong focus on demanding technological characteristics,
experimental activities and real applications.
ASCE Earth & Space 2010 OWT Symposium
http://content.asce.org/files/pdf/EarthSpace2010Prelim-FINAL.pdf
http://ascelibrary.org/doi/book/10.1061/9780784410967
Lezione del 12 ottobre 2016 al Corso di Progettazione Strutturale Antincendio,
Prof. Ing. Franco Bontempi
Facolta' di Ingegneria Civile e Industriale
Universita' degli Studi di Roma La Sapienza
Socially Constructing Warships — Emergence, growth & senescence of a knowledg...William Hall
This presentation looks at the case study of Tenix Defence and the nature of a ship and its crew from biological points of view to understand how they functioned as autopoietic (i.e. "living") entities in their respective environments.
Oscillating water column and government regulation of oceanArjun Puthusseri
This paper describes the methods developed by Wavegen during the design and development phase of its air turbines suitable for installation into active renewable energy breakwater schemes, like the one being built in Mutriku, Northern Spain, ref. Fig.1.The breakwater water is located in 7m of water MWL and is NNE facing. The majority of the structure is of a conventional rubble mound construction and has a crescent shape with an overall length off 600m. The active zone where the oscillating water columns (OWC) are positioned are made from reinforced concrete and are of a novel modular construction.
Structural Integrity Evaluation of Offshore Wind TurbinesFranco Bontempi
Wind turbines are complex structures that should deal with adverse weather
conditions, are exposed to impacts or ship collisions and, due to the strategic roles in
the energetic supplying, can be the goal of military or malevolent attacks.
Even if a structure cannot be design to resist any unforeseeable critical event
or arbitrarily high accidental action, this kind of systems should be able to maintain
integrity and a certain level of functionality also under accidental circumstances,
which are not contemplated or cannot be considered in the usual design verification.
According to a performance-based design view, the entity of actions to be resisted
and the services levels to be maintained are the design objectives, which should be
defined by the stakeholders and by the designer in respect of the regulation in force.
For what said above, the structural integrity of wind turbines is a central issue
in the framework of a safe design: it depends on different factors, like exposure,
vulnerability and robustness. Particularly, the requirement of structural vulnerability
and robustness are discussed in this paper and a numerical application is presented,
in order to evaluate the effects of a ship collision on the structural system of an
offshore wind turbine.
The investigation resorts nonlinear dynamic analyses performed on the finite
element model of the turbine and considers three different scenarios for the ship
collision. The review of the investigation results allows for an evaluation of the
turbine structural integrity after the impact and permits to identify some
characteristics of the system, which are intrinsic to the chosen organization of the
elements within the structure.
Structural Integrity Evaluation of Offshore Wind TurbinesFranco Bontempi
Wind turbines are complex structures that should deal with adverse weather
conditions, are exposed to impacts or ship collisions and, due to the strategic roles in
the energetic supplying, can be the goal of military or malevolent attacks.
Even if a structure cannot be design to resist any unforeseeable critical event
or arbitrarily high accidental action, this kind of systems should be able to maintain
integrity and a certain level of functionality also under accidental circumstances,
which are not contemplated or cannot be considered in the usual design verification.
According to a performance-based design view, the entity of actions to be resisted
and the services levels to be maintained are the design objectives, which should be
defined by the stakeholders and by the designer in respect of the regulation in force.
For what said above, the structural integrity of wind turbines is a central issue
in the framework of a safe design: it depends on different factors, like exposure,
vulnerability and robustness. Particularly, the requirement of structural vulnerability
and robustness are discussed in this paper and a numerical application is presented,
in order to evaluate the effects of a ship collision on the structural system of an
offshore wind turbine.
The investigation resorts nonlinear dynamic analyses performed on the finite
element model of the turbine and considers three different scenarios for the ship
collision. The review of the investigation results allows for an evaluation of the
turbine structural integrity after the impact and permits to identify some
characteristics of the system, which are intrinsic to the chosen organization of the
elements within the structure.
It is found that the manufacturing processes are responsible of many defects which may arise in fibers,
matrix and lamina. These defects, if they exist include misalignment of fibers, cracks in matrix, non
– uniform distribution of the fibers in the matrix, voids in fibers and matrix, delaminated
regions, and initial stress in the lamina as a result of its manufacture and further treatment.
The above mentioned defects tend to propagate as the lamina is loaded causing an accelerated
rate of failure. The experimental and theoretical results in this case tend to differ. Hence, due to the
limitations necessary in the idealization of the lamina components, the properties estimated should be
proved experimentally.
Offshore wind turbines are relatively complex structural and mechanical systems located ina highly demanding environment. In this study, the fundamental aspects and major issues related to the design of such structures are inquired. The system approach is proposed to carry out the design of the structural parts: in accordance with this philosophy, a decomposition of the system (environment, structure, actions/loads) and of the structural
performance is carried out, in order to organize the qualitative and quantitative assessment in various sub-problems. These can be faced by sub-models of different complexity both for the structural behavior and for the load models. Numerical models are developed to assess the safety performance under aerodynamic and hydrodynamic actions. In the structural analyses, three types of turbine support structures have been considered and compared: a
monopile, a tripod and a jacket.
offshore structural design description, starts from codes and standards, data requirements, plate form data, extreme storm parameters, operational parameters and installation parameters
To those who may have an interest in how Bayes has inspired and influenced my research and industrial activities. What you will see is indeed only selected parts of the works of my student and colleagues in academia and industry - over more than 30 years. There is much more - and much more to come.
Corso di dottorato & Corso di formazione StroNGER2012
Basi di OTTIMIZZAZIONE STRUTTURALE, 6 luglio 2016 (totale di 8 ore)
&
LA PROGETTAZIONE STRUTTURALE ATTRAVERSO L’ANALISI DI CASI CRITICI, 7 e 8 luglio (totale di 16 ore)
I Restauri e la Città: l’esempio del Colosseo e della Casa di AugustoStroNGER2012
GLI ATTORI DEL DIVENIRE URBANO
Facoltà di Ingegneria
Sapienza Università di Roma
Sala del Chiostro 26 NOVEMBRE 2015
a cura di
Alessandro Cutini - Franco Bontempi
SISTEMILA RETE STRADALE URBANA:UN’EMERGENZA DEL QUOTIDIANO O UN’OPPORTUNITA’ ...StroNGER2012
GLI ATTORI DEL DIVENIRE URBANO
Facoltà di Ingegneria
Sapienza Università di Roma
Sala del Chiostro 26 NOVEMBRE 2015
a cura di
Alessandro Cutini - Franco Bontempi
INFRASTRUTTURE IN AMBITO URBANO: COMPLESSITA’ DI PROGETTO E DURABILITA’StroNGER2012
GLI ATTORI DEL DIVENIRE URBANO
Facoltà di Ingegneria
Sapienza Università di Roma
Sala del Chiostro 26 NOVEMBRE 2015
a cura di
Alessandro Cutini - Franco Bontempi
61Resilienza dei centri urbani e rilievo delle costruzioni: un binomio indivi...StroNGER2012
GLI ATTORI DEL DIVENIRE URBANO
Facoltà di Ingegneria
Sapienza Università di Roma
Sala del Chiostro 26 NOVEMBRE 2015
a cura di
Alessandro Cutini - Franco Bontempi
Roma e le sue acque:il punto di vista della Protezione CivileStroNGER2012
GLI ATTORI DEL DIVENIRE URBANO
Facoltà di Ingegneria
Sapienza Università di Roma
Sala del Chiostro 26 NOVEMBRE 2015
a cura di
Alessandro Cutini - Franco Bontempi
Una visione ampia dei sistemi: robustezza e resilienza.StroNGER2012
GLI ATTORI DEL DIVENIRE URBANO
Facoltà di Ingegneria
Sapienza Università di Roma
Sala del Chiostro 26 NOVEMBRE 2015
a cura di
Alessandro Cutini - Franco Bontempi
L’investigazione antincendio sugli aspetti strutturali: una proposta di codificaStroNGER2012
I numerosi incendi che si innescano e danneggiano
le strutture hanno rivoluzionato, da una parte,
molte procedure sulla prevenzione definendo metodologie
gestionali più efficaci e stanno, dall’altra,
portando ad affinare procedure investigative
codificate atte a ridurre il rischio di errori/omissioni
durante le indagini.
Lo scopo di questo articolo è quello di esporre
una metodologia codificata di Structural Fire Investigation
(Investigazione sugli aspetti strutturali in
caso di incendio) atta ad individuare le cause scatenanti,
pregresse e latenti, che hanno determinato
l’evento accidentale.
L’iter investigativo, associato a determinate operazioni
strutturali e forensi che partono dalla raccolta
delle informazioni iniziali al repertamento e
controllo documentale per poi completarsi con le
verifiche computazionali, sicuramente aiuta a determinare,
in maniera rigorosa, le cause e l’origine
di un incendio. La modellazione degli incendi con
il software del NIST, Fire Dynamics Simulator
(FDS) e l’analisi strutturale con vari codici di calcolo,
permettono di verificare determinate ipotesi
maturate durante il repertamento e di avvalorare
scientificamente l’analisi semiotica rilevata sulla
scena, fornendo dati forensi utili in fase dibattimentale.
Quindi un’attività investigativa pianificata, permette
a qualsiasi utente, (VV.F., personale delle Forze
dell’Ordine, Consulente, Perito, CTU o Libero
Professionista), di svolgere indagini in maniera appropriata
secondo una linea guida che permette
di non tralasciare controlli a volte rilevanti per la
stesura della documentazione complessiva in forma
di report finale.
29 May 2015 - Rome
Research Meeting with
University of Brasilia–Brazil
University of Nebraska-Lincoln (Omaha Campus)
University of Rome La Sapienza
StroNGER
29 May 2015 - Rome
Research Meeting with
University of Brasilia–Brazil
University of Nebraska-Lincoln (Omaha Campus)
University of Rome La Sapienza
StroNGER
29 May 2015 - Rome
Research Meeting with
University of Brasilia–Brazil
University of Nebraska-Lincoln (Omaha Campus)
University of Rome La Sapienza
StroNGER
29 May 2015 - Rome
Research Meeting with
University of Brasilia–Brazil
University of Nebraska-Lincoln (Omaha Campus)
University of Rome La Sapienza
StroNGER
Uso delle fibre di basalto nel risanamento degli edifici storiciStroNGER2012
Intervento di Stefania Arangio a:
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Ordine degli Ingegneri della Provincia di Roma
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IDENTIFICAZIONE STRUTTURALE DEL COMPORTAMENTO SPERIMENTALE DI CENTINE INNOVAT...StroNGER2012
Contributo a IF CRASC'15 di Alessandra Castelli e Francesco Petrini.
14-16 maggio 2015.
Universita' degli Studi di Roma La Sapienza
Facolta' di Ingegneria Civile e Industriale
ifcrasc15@stronger2012.com
Corso Ottimizzazione Strutturale Sapienza 2015StroNGER2012
Il corso vuole introdurre in maniera semplice i concetti, i metodi, gli strumenti necessari all’ottimizzazione di una struttura in termini di capacità prestazionali e sicurezza. L’attenzione è focalizzata sulle idee e sulle applicazioni, nella convinzione che gran parte dei dettagli algoritmici, seppure fondamentali nelle applicazioni più sofisticate, possano essere rimandati a successivi approfondimenti: questo anche alla luce degli strumenti computazionali moderni che permettono di concentrarsi sulla progettazione concettuale dei sistemi strutturali nelle forme più attuali. Gli studenti potranno quindi essere capaci di impostare e comprendere i processi ideativi alla base delle moderne forme strutturali che si presentano per le coperture, i ponti e gli edifici alti.
MIGLIORAMENTO ED ADEGUAMENTO SISMICO DI STRUTTURE ESISTENTI ATTRAVERSO L’UTIL...StroNGER2012
MIGLIORAMENTO ED ADEGUAMENTO SISMICO DI STRUTTURE ESISTENTI ATTRAVERSO L’UTILIZZO DI MATERIALI COMPOSITI IN FRP.
14 e 21 Aprile 2015.
https://www.ording.roma.it/seminario.aspx?id=14727
Visual Style and Aesthetics: Basics of Visual Design
Visual Design for Enterprise Applications
Range of Visual Styles.
Mobile Interfaces:
Challenges and Opportunities of Mobile Design
Approach to Mobile Design
Patterns
White wonder, Work developed by Eva TschoppMansi Shah
White Wonder by Eva Tschopp
A tale about our culture around the use of fertilizers and pesticides visiting small farms around Ahmedabad in Matar and Shilaj.
Transforming Brand Perception and Boosting Profitabilityaaryangarg12
In today's digital era, the dynamics of brand perception, consumer behavior, and profitability have been profoundly reshaped by the synergy of branding, social media, and website design. This research paper investigates the transformative power of these elements in influencing how individuals perceive brands and products and how this transformation can be harnessed to drive sales and profitability for businesses.
Through an exploration of brand psychology and consumer behavior, this study sheds light on the intricate ways in which effective branding strategies, strategic social media engagement, and user-centric website design contribute to altering consumers' perceptions. We delve into the principles that underlie successful brand transformations, examining how visual identity, messaging, and storytelling can captivate and resonate with target audiences.
Methodologically, this research employs a comprehensive approach, combining qualitative and quantitative analyses. Real-world case studies illustrate the impact of branding, social media campaigns, and website redesigns on consumer perception, sales figures, and profitability. We assess the various metrics, including brand awareness, customer engagement, conversion rates, and revenue growth, to measure the effectiveness of these strategies.
The results underscore the pivotal role of cohesive branding, social media influence, and website usability in shaping positive brand perceptions, influencing consumer decisions, and ultimately bolstering sales and profitability. This paper provides actionable insights and strategic recommendations for businesses seeking to leverage branding, social media, and website design as potent tools to enhance their market position and financial success.
Fonts play a crucial role in both User Interface (UI) and User Experience (UX) design. They affect readability, accessibility, aesthetics, and overall user perception.
Storytelling For The Web: Integrate Storytelling in your Design ProcessChiara Aliotta
In this slides I explain how I have used storytelling techniques to elevate websites and brands and create memorable user experiences. You can discover practical tips as I showcase the elements of good storytelling and its applied to some examples of diverse brands/projects..
Book Formatting: Quality Control Checks for DesignersConfidence Ago
This presentation was made to help designers who work in publishing houses or format books for printing ensure quality.
Quality control is vital to every industry. This is why every department in a company need create a method they use in ensuring quality. This, perhaps, will not only improve the quality of products and bring errors to the barest minimum, but take it to a near perfect finish.
It is beyond a moot point that a good book will somewhat be judged by its cover, but the content of the book remains king. No matter how beautiful the cover, if the quality of writing or presentation is off, that will be a reason for readers not to come back to the book or recommend it.
So, this presentation points designers to some important things that may be missed by an editor that they could eventually discover and call the attention of the editor.
Can AI do good? at 'offtheCanvas' India HCI preludeAlan Dix
Invited talk at 'offtheCanvas' IndiaHCI prelude, 29th June 2024.
https://www.alandix.com/academic/talks/offtheCanvas-IndiaHCI2024/
The world is being changed fundamentally by AI and we are constantly faced with newspaper headlines about its harmful effects. However, there is also the potential to both ameliorate theses harms and use the new abilities of AI to transform society for the good. Can you make the difference?
Maximize Your Content with Beautiful Assets : Content & Asset for Landing Page pmgdscunsri
Figma is a cloud-based design tool widely used by designers for prototyping, UI/UX design, and real-time collaboration. With features such as precision pen tools, grid system, and reusable components, Figma makes it easy for teams to work together on design projects. Its flexibility and accessibility make Figma a top choice in the digital age.
1. Advanced Topics in
Offshore Wind Turbines Design
Franco Bontempi, Ph.D., P.E.,
Professor of Structural Analysis and Design
School of Engineering
University of Rome La Sapienza
ITALY
3. 3
INDEX OF TOPICS
• Evolutive / Innovative Design
• System Complexity
1) Structural Systems Decomposition
2) Enlarged Structural System
(Actions Decomposition)
3) System Performance Decomposition
4. 4
NEW KNOWLEDGE
REQUIRED BY
AN INNOVATIVE
DESIGN
ACTUAL
KNOWLEDGE
BASIS KNOWLEDGE
REQUIRED
BY AN EVOLUTIVE
DESIGN
Evolutive / Innovative Designs (1)
12. 12
Scheme of strutted
support structures for
OWT positioned in sea
with water level ranging
from 20 to 35 m
Innovative Concepts
FLEXIBILITY OF CONFIGURATION
21. 21
ENVIRONMENT ZONE
Structure
Non
environmental
solicitations
EXCHANGE ZONE
Wind and wave flow
Structural (non-
environmental)
system
Site-specific
environment
Wind site basic
parameters
Other
environmental
agents
Wave site basic
parameters
Wind, wave and
sea current
actions
Aerodynamic and
Aeroelastic
phenomena
Hydrodynamic
phenomena
Enlarged Structural System
ENVIRONMENT
ZONE
EXCHANGE
ZONE
STRUCTURE
23. 23
Performance decomposition
STRUCTURAL
SYSTEM
PERFORMANCE
INTRINSIC
TO THE
STRUCTURAL
SYSTEM
REFERRED
TO SPECIFIC
REQUIREMENTS
i.e. LIMIT STATES
DYNAMIC
CHARACTERIZATION
STRUCTURAL
ROBUSTNESS
SERVICEABILITY
LIMIT STATES
ACCIDENTAL /
EXTREME
LIMIT STATES
ULTIMATE
LIMIT STATES
deformation limits
connection decompression / slippage
natural frequencies
...
strength of the parts, elements, connections
strength of the whole structure
global / local stability
...
survivability of the
structural system in
presence of extreme and/or
unforeseen, situations
compatibility of the intrinsic vibration
characteristics of the structural system with those of
the acting forces and loads and
compatibility for the movement and the accelerations
of the support system for the functionality of the
turbine
decrease in the load bearing capacity proportional
to the damage
24. 24
STRUCTURE
Main structure
Nacelle
Rotor–nacelle assembly
Operation
Maintenance
Emergency
Support structure
ACTIONS/LOADSENVIRONMENT
Junctions/bearings
Rotor
Junctions/bearings
Blades
Junctions/bearings
Tower
Junctions
Substructure
Junctions
Foundations
Junctions
Secondary structure
Energy production
Energy transfer
Auxiliary structure
Gravitational / Inertial
Gravity
Braking
Aviation
Seismic activity
Aerodynamic
Hydrodynamic
Actuation
Other
Wave
Current
Torque control
Mechanical breaking loads
Yaw and pitch actuator loads
Tsunami
Impact loads
Wake loads
Wind conditions
Marine conditions
Seabed movement and scour
Other conditions
Normal wind conditions
Extreme wind conditions
Waves
Sea currents
Water level
Marine growth
Air temperature
Humidity
Solar radiation
Rain, hail, snow, ice
Chemically active substances
Mechanically active substances
Environmental aggressiveness
Lighting
Seismicity
Water density
Water temperature
Maritime traffic
Normal wave conditions
Extreme wave conditions
Serviceability Safety Reliability Robustness
Service Limit States – SLS Ultimate Limit States – ULS_1 Accidental Limit States – ALSUltimate Limit States – ULS_2
Fatigue Limit States – FLS
Deflections/Displacements
Vibrations Strain limit
Stress limit Degradation effects
Buckling Fire
Impact
Explosion
PERFORMANCE
25. 25
Functional Analysis/
Resources Allocation
- Decomposition to lower-level function
- Allocate performance
- Define functional interfaces
- Define functional architecture
Requirement
loop
Design loop
PROCESS
INPUT
Historic Analyses
Evolutive / Innovative
Design
Risk Management
PROCESS
OUTPUT
Synthesis
- Transform architecture
- Define alternative product concepts
- Define physical interfaces
- Define alternative product
and process solutions
Requirements Analysis
- Analyze missions and enviroments
- Identify functional requirements
- Define performance and design
constraint requirement
System
Modeling
And
Analysis
SYSTEM DESIGN