The document summarizes a presentation on a nonlinear transient analysis of a steel bulkhead on a semi-submersible rig subjected to wave loading. The analysis used ANSYS tools to create a finite element model of the bulkhead, apply time-varying wave pressure loads, and evaluate the structure's response in terms of deformation, stresses, and failure modes. The results showed the bulkhead's plastic strain and stresses remained below allowable values, and connections were also found to be adequate. Further optimizations and studies using ANSYS capabilities were suggested.
Proof load testing of the viaduct De BeekEva Lantsoght
Proof load testing can be a suitable method to show that a bridge can carry the required loads
from the code without distress. This paper addresses the preparation, execution, and analysis of a
proof load test on a four-span reinforced concrete solid slab bridge, viaduct de Beek. The bridge
has one lane in each direction, but was restricted to a single lane, since an assessment showed
that the capacity is not sufficient to allow both lanes. For this proof load test, the bridge was
heavily equipped with sensors, so that early signs of distress can be seen. The difficulty in this test
was that, for safety reasons, only the first span could be tested, but that the lowest ratings were
found in the second span. A direct approval of the viaduct by proof loading was thus not possible,
and an analysis was necessary after the field test. The result of this analysis is that only by allowing
6.7% of plastic redistribution in the second span, sufficient capacity can be demonstrated.
Recommendations for proof load testing of reinforced concrete slab bridges - ...Eva Lantsoght
Proof loading of existing bridges is an option to study the capacity when crucial information about
the structure is lacking. To define the loading criteria for proof load testing, a review of the
literature has been made, finite element models of existing viaducts have been made, and on
these viaducts, proof loading tests have been carried out. These bridges were heavily
instrumented, to learn as much as possible about the structural behaviour during proof loading.
Additional laboratory experiments have been used to develop controlled loading protocols, and to
identify which stop criteria can be used for which case. As a result of the analysis and experiments,
recommendations are given for proof loading of bridges with respect to the required maximum
load and the stop criteria. These recommendations have resulted in a guideline for proof loading
of existing reinforced concrete slab bridges for The Netherlands.
Recommendations for proof load testing of reinforced concrete slab bridges - ...Eva Lantsoght
Proof loading of existing bridges is an option to study the capacity when crucial information about
the structure is lacking. To define the loading criteria for proof load testing, a review of the
literature has been made, finite element models of existing viaducts have been made, and on
these viaducts, proof loading tests have been carried out. These bridges were heavily
instrumented, to learn as much as possible about the structural behaviour during proof loading.
Additional laboratory experiments have been used to develop controlled loading protocols, and to
identify which stop criteria can be used for which case. As a result of the analysis and experiments,
recommendations are given for proof loading of bridges with respect to the required maximum
load and the stop criteria. These recommendations have resulted in a guideline for proof loading
of existing reinforced concrete slab bridges for The Netherlands.
Smart Fractured Reservoir Development StrategiesITE Oil&Gas
Presentation at TUROGE 2014 (Turkish International Oil and Gas Conference) on Smart Fractured Reservoir Development Strategies.
By Mark Cottrell - Manager, FracMan Technology Group Europe Golder Associates
Application of Modified Bond Model to the capacity of Ruytenschildt BridgeEva Lantsoght
The Ruytenschildt bridge in Friesland is a continuously supported concrete slab bridge, and was tested in two spans to failure in August 2014. The results of this experiment are valuable for the analysis of existing slab bridges and for analyzing the moment and shear capacity of reinforced concrete slabs and slab bridges.
Earlier analyses found that a large number of existing slab bridges in The Netherlands rate as insufficient for shear. However, these analyses did not take into account the beneficial effect of transverse load redistribution. Therefore, the Modified Bond Model was developed. This model covers beam shear, punching shear and flexure for reinforced concrete slabs.
The test results are now to compare to the predictions with the Modified Bond Model. Since the Modified Bond Model is independent of the failure mode, the maximum load that is found can be directly correlated to the maximum tandem load in the experiment. Comparing the test results on the bridge with the predictions based on the Modified Bond Model shows good correspondence. The results are also compared to a new proposal for vmin, the minimum shear stress at which shear failure takes place. For smaller value, a moment failure takes place.
While the presented results only show a comparison between 2 tests on an existing bridge and the proposed Modified Bond Model, the results indicate that the Modified Bond Model can become a useful tool for design and analysis of reinforced concrete slabs based on the principles of the theory of plasticity.
Shear and moment capacity of the Ruytenschildt BridgeEva Lantsoght
In August 2014, the Ruytenschildt Bridge, a reinforced concrete solid slab bridge, in Friesland, the Netherlands was tested until failure. One of the goals of the experiment is to analyze the failure mode of the slab bridge under a tandem of 4 wheel loads and to compare the capacity of the full bridge structure to the predicted results, to have an idea of the residual strength of existing bridges. The methods used are experi-mental (testing of the bridge to failure in two of its five spans) and analytical. The analytical work involved predicting the bending moment capacity, the shear capacity and the punching capacity of the bridge. In both spans, the bridge failed in flexure. The total capacity during the experiment was significantly higher than pre-dicted. The results indicate that the traditional rating procedures for shear are very conservative when applied to slab bridges that benefit from transverse load redistribution.
Reliability index after proof load testing: viaduct De BeekEva Lantsoght
Proof load tests can be used for a field assessment of the bridge under study. This paper addresses the determination of the reliability index of an existing bridge by means of proof loading through the case study viaduct De Beek. The information of this bridge is used to determine the updated reliability index after proof load testing. A sensitivity study is carried out to identify the effect of the assumptions with regard to the coefficient of variation on the resistance and load effects. In the current practice of proof load testing with vehicles, it can typically only be demonstrated that a certain vehicle type can cross the bridge safely. The results in this paper provide a new insight on the updating of the reliability index after proof load testing. Consensus on the coefficients of variation that need to be used on the resistance and load effects, is still missing.
Design analysis of the roll cage for all terrain vehicleeSAT Journals
Abstract We have tried to design an all terrain vehicle that meets international standards and is also cost effective at the same time. We have focused on every point of roll cage to improve the performance of vehicle without failure of roll cage. We began the task of designing by conducting extensive research of ATV roll cage through finite element analysis. A roll cage is a skeleton of an ATV. The roll cage not only forms the structural base but also a 3-D shell surrounding the occupant which protects the occupant in case of impact and roll over incidents. The roll cage also adds to the aesthetics of a vehicle. The design and development comprises of material selection, chassis and frame design, cross section determination, determining strength requirements of roll cage, stress analysis and simulations to test the ATV against failure. Keywords: Roll cage, material, finite element analysis, strength
Proof load testing of the viaduct De BeekEva Lantsoght
Proof load testing can be a suitable method to show that a bridge can carry the required loads
from the code without distress. This paper addresses the preparation, execution, and analysis of a
proof load test on a four-span reinforced concrete solid slab bridge, viaduct de Beek. The bridge
has one lane in each direction, but was restricted to a single lane, since an assessment showed
that the capacity is not sufficient to allow both lanes. For this proof load test, the bridge was
heavily equipped with sensors, so that early signs of distress can be seen. The difficulty in this test
was that, for safety reasons, only the first span could be tested, but that the lowest ratings were
found in the second span. A direct approval of the viaduct by proof loading was thus not possible,
and an analysis was necessary after the field test. The result of this analysis is that only by allowing
6.7% of plastic redistribution in the second span, sufficient capacity can be demonstrated.
Recommendations for proof load testing of reinforced concrete slab bridges - ...Eva Lantsoght
Proof loading of existing bridges is an option to study the capacity when crucial information about
the structure is lacking. To define the loading criteria for proof load testing, a review of the
literature has been made, finite element models of existing viaducts have been made, and on
these viaducts, proof loading tests have been carried out. These bridges were heavily
instrumented, to learn as much as possible about the structural behaviour during proof loading.
Additional laboratory experiments have been used to develop controlled loading protocols, and to
identify which stop criteria can be used for which case. As a result of the analysis and experiments,
recommendations are given for proof loading of bridges with respect to the required maximum
load and the stop criteria. These recommendations have resulted in a guideline for proof loading
of existing reinforced concrete slab bridges for The Netherlands.
Recommendations for proof load testing of reinforced concrete slab bridges - ...Eva Lantsoght
Proof loading of existing bridges is an option to study the capacity when crucial information about
the structure is lacking. To define the loading criteria for proof load testing, a review of the
literature has been made, finite element models of existing viaducts have been made, and on
these viaducts, proof loading tests have been carried out. These bridges were heavily
instrumented, to learn as much as possible about the structural behaviour during proof loading.
Additional laboratory experiments have been used to develop controlled loading protocols, and to
identify which stop criteria can be used for which case. As a result of the analysis and experiments,
recommendations are given for proof loading of bridges with respect to the required maximum
load and the stop criteria. These recommendations have resulted in a guideline for proof loading
of existing reinforced concrete slab bridges for The Netherlands.
Smart Fractured Reservoir Development StrategiesITE Oil&Gas
Presentation at TUROGE 2014 (Turkish International Oil and Gas Conference) on Smart Fractured Reservoir Development Strategies.
By Mark Cottrell - Manager, FracMan Technology Group Europe Golder Associates
Application of Modified Bond Model to the capacity of Ruytenschildt BridgeEva Lantsoght
The Ruytenschildt bridge in Friesland is a continuously supported concrete slab bridge, and was tested in two spans to failure in August 2014. The results of this experiment are valuable for the analysis of existing slab bridges and for analyzing the moment and shear capacity of reinforced concrete slabs and slab bridges.
Earlier analyses found that a large number of existing slab bridges in The Netherlands rate as insufficient for shear. However, these analyses did not take into account the beneficial effect of transverse load redistribution. Therefore, the Modified Bond Model was developed. This model covers beam shear, punching shear and flexure for reinforced concrete slabs.
The test results are now to compare to the predictions with the Modified Bond Model. Since the Modified Bond Model is independent of the failure mode, the maximum load that is found can be directly correlated to the maximum tandem load in the experiment. Comparing the test results on the bridge with the predictions based on the Modified Bond Model shows good correspondence. The results are also compared to a new proposal for vmin, the minimum shear stress at which shear failure takes place. For smaller value, a moment failure takes place.
While the presented results only show a comparison between 2 tests on an existing bridge and the proposed Modified Bond Model, the results indicate that the Modified Bond Model can become a useful tool for design and analysis of reinforced concrete slabs based on the principles of the theory of plasticity.
Shear and moment capacity of the Ruytenschildt BridgeEva Lantsoght
In August 2014, the Ruytenschildt Bridge, a reinforced concrete solid slab bridge, in Friesland, the Netherlands was tested until failure. One of the goals of the experiment is to analyze the failure mode of the slab bridge under a tandem of 4 wheel loads and to compare the capacity of the full bridge structure to the predicted results, to have an idea of the residual strength of existing bridges. The methods used are experi-mental (testing of the bridge to failure in two of its five spans) and analytical. The analytical work involved predicting the bending moment capacity, the shear capacity and the punching capacity of the bridge. In both spans, the bridge failed in flexure. The total capacity during the experiment was significantly higher than pre-dicted. The results indicate that the traditional rating procedures for shear are very conservative when applied to slab bridges that benefit from transverse load redistribution.
Reliability index after proof load testing: viaduct De BeekEva Lantsoght
Proof load tests can be used for a field assessment of the bridge under study. This paper addresses the determination of the reliability index of an existing bridge by means of proof loading through the case study viaduct De Beek. The information of this bridge is used to determine the updated reliability index after proof load testing. A sensitivity study is carried out to identify the effect of the assumptions with regard to the coefficient of variation on the resistance and load effects. In the current practice of proof load testing with vehicles, it can typically only be demonstrated that a certain vehicle type can cross the bridge safely. The results in this paper provide a new insight on the updating of the reliability index after proof load testing. Consensus on the coefficients of variation that need to be used on the resistance and load effects, is still missing.
Design analysis of the roll cage for all terrain vehicleeSAT Journals
Abstract We have tried to design an all terrain vehicle that meets international standards and is also cost effective at the same time. We have focused on every point of roll cage to improve the performance of vehicle without failure of roll cage. We began the task of designing by conducting extensive research of ATV roll cage through finite element analysis. A roll cage is a skeleton of an ATV. The roll cage not only forms the structural base but also a 3-D shell surrounding the occupant which protects the occupant in case of impact and roll over incidents. The roll cage also adds to the aesthetics of a vehicle. The design and development comprises of material selection, chassis and frame design, cross section determination, determining strength requirements of roll cage, stress analysis and simulations to test the ATV against failure. Keywords: Roll cage, material, finite element analysis, strength
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Comparison of stress between winkler bach theory and ansys finite element met...eSAT Journals
Abstract Crane Hooks are highly liable components and are always subjected to failure due to the amount of stresses concentration which can eventually lead to its failure. To study the stress pattern of crane hook in its loaded condition, a solid model of crane hook is prepared with the help of CATIA (Computer Aided Three Dimensional Interactive Application) software. Pattern of stress distribution in 3D model of crane hook is obtained using ANSYS software. The stress distribution pattern is verified for its correctness on model of crane hook using Winkler-Bach theory for curved beams. The complete study is an initiative to establish an ANSYS based Finite Element procedure, by validating the results, for the measurement of stress with Winkler-Bach theory for curved beams. Keywords: Crane Hook, CATIA, ANSYS, Curved Beam, Stress, Winkler-Bach Theory
This is a Major Project Report successfully done at DVRCET under the guidance of Mechanical Engineering Department & the Managing Director of NIRAJA TECHNOLOGIES located at Uppal (Hyderabad).
Present. SOFE '17 China: Talk in SOFE Symp 2017 Prospects for stellarators b...Vicent_Net
Oral Contribution tittled 'Prospects for stellarators based on additive manufacturing' given in TOFE (27th IEEE Symposium On Fusion Engineering), Shanghai, China, 2017, organized by 'Princeton Plasma Physics Laboratory' and the 'Institute of Electrical and Electronics Engineers' (IEEE), USA.
The technologies, based on additive manufacturing (3D-printing), researched during the last years are summarised. Dimensional metrology studies of 3D-printed parts, 3Dformwork assays and, electrodeposition-electroplating studies for vacuum vessels are reported.The prospects for the appplication for the construction of certain fusion devices are discussed.
All of material inside is un-licence, kindly use it for educational only but please do not to commercialize it.
Based on 'ilman nafi'an, hopefully this file beneficially for you.
Thank you.
Simtec Hungary, the Certified Ansys Channel Partner in Hungary, organizes Ansys Technology Day in Budapest. In this free of charge event, you will have the opportunity to find out about the latest Ansys release updates, hear some fascinating Simtec customer stories and discover the latest simulation news, all while meeting our Simtec experts!
Simtec S.A. the Elite Ansys Channel Partner in Greece, organizes the 1st Ansys Technology Day in Greece, at Demokritos.
Join us for an immersive experience at the 1st Ansys Technology Day hosted by Simtec at Demokritos!
The event is FREE.
The event is targeted to Companies and Research Institutes.
🌟 Exciting News for Engineers and Innovators in Greece!🌟
Simtec S.A. the Elite Ansys Channel Partner in Greece, organizes the 1st Ansys Technology Day in Greece, at Demokritos.
Join us for an immersive experience at the 1st Ansys Technology Day hosted by Simtec at Demokritos!
The event is FREE.
The event is targeted to Companies and Research Institutes.
Simtec Europe, ki je Elite Ansys Channel Partner v Sloveniji, organizira 1. Ansys Technology Day v Sloveniji. Na tem brezplačnem dogodku boste imeli priložnost izvedeti več o najnovejših različicah Ansys programskih paketov, predstavljene bodo tudi izkušnje strank, ki uporabljajo Ansys. Prav tako pa vam bodo naši tehnični strokovnjaki predstavili najnovejše informacije o simulacijah.
Simtec Europe, the Elite Ansys Channel Partner in Slovenia, organizes the 1st Ansys Technology Day in Slovenia. In this free of charge event, you will have the opportunity to find out about the latest Ansys release updates, hear some fascinating Simtec customer stories and discover the latest simulation news, all while meeting our Simtec experts!
Simtec, the Elite Ansys Channel Partner for SE, organizes introductory online trainings for Ansys electromagnetic software. This is the best way to learn everything you need to know about how ansys software can help improve your products and always be ahead of competition! Simtec experts, with more than 20 years of experience in simulation will guide you to your way to success!
Simtec Europe organizes the 1st Ansys Technology Day in Ljubljana, Slovenia, June 1st. Register this free live event, to learn anything there is to know about Ansys! Discover the key to success with Simtec! You will learn about new Ansys products and acquisitions and all the simulation tips and tricks from Simtec experts. This event is a great opportunity to meet industry peers and simulation gurus. You will also have the chance to learn how simtec and ansys have helped some of Slovenia's industry best to improve their products!
SIMTEC, the Elite certified channel partner of Ansys in SE Europe, organizes online introductory training on:
Introductory Training in Ansys Electromagnetics.
The e-trainings are addressed to engineers from Companies that are involved in the designing process, or in the Research and Development (R&D) of innovative new products and processes.
SIMTEC, the Elite certified channel partner of Ansys in SE Europe, organizes online introductory training on:
Introductory Training in Ansys Mechanical and CFD.
The e-trainings are addressed to engineers from Companies that are involved in the designing process, or in the Research and Development (R&D) of innovative new products and processes.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
A Nonlinear Transient Analysis of a wave-loaded steel bulkhead on a semi-submersible drilling rig
1. Ocean Rig – Engineering Department
Structural Engineer - Kardasi Sofia
“A Non-linear Transient Analysis of a wave-loaded steel
bulkhead on a semi-submersible rig”
ANSYS Mechanical - StructuresANSYS Mechanical - Structures
2018 ANSYS Convergence Conference2018 ANSYS Convergence Conference
5 July, Athens, Greece5 July, Athens, Greece
2. 2
PRESENTATION OUTLINE
Introduction – Scope of the presentation
ANSYS Tools selected
Model Description
Results
Connections Check
Conclusion
Further Capabilities
3. 3
Introduction – Scope of the presentation
Leiv Eiriksson OR
5th
Generation Deep Water Semisubmersible Drilling Rig,
Bingo 9000 design
For drilling operations in water depths 70-2285 m
Operating in harsh environment
DNV Offshore Technical Guidance (OTG 14) for Horizontal
wave impact loads on topside structure from large and
steep waves–annual probability of 10-2
, for ULS design
conditions (developed as a result of fatality).
Negative air gap: when the wave upwell elevation is
higher than the underside of the deck box.
What needs to be checked:
The local structural integrity of the wave-loaded area
The global integrity of the whole structure – Rig
The safety related equipment and personnel safety.
4. 4
ANSYS Tools selected
ANSYS Mechanical for StructuresANSYS Mechanical for Structures:: Finite Element ModelingFinite Element Modeling
Strength Analysis: to check model’s performance & possible failure modes
Material nonlinearities – plasticity
Newton-Raphson Method for equilibrium iterations (Force – Displacement)
Contacts
Advanced nonlinear stress simulations & Large Deformation of parts
Transient Analysis: the Full Method
Convergence criteria – Nonlinear Controls
5. 5
Model Description
GeometryGeometry
3D Model in Autodesk Inventor
Bulkhead of an area of six windows at Port Side – Worst case scenario
Deck Framing Structure & Plating at three elevations
Longitudinal Bulkheads & Girders on the Side view
Windows protection steel cover & bolted mechanism on the inside
ANSYS Design Modeler – Simplification and clean-up of the model
6. 6
Model Description
ANSYS Design ModelerANSYS Design Modeler
Import 3D model into Geometry
Suppress some bodies that will not be used in the analysis
Midsurface: creation of surface bodies that are midway between existing solid bodies
Surface Extension: close all the gaps between edge sets
Divide all the bodies into two parts; one for the structure & one for the windows layout
Activation of shared topology for bodies that are included in the same parts
The model is ready to be edited in ANSYS Mechanical → Transient Structural AnalysisANSYS Mechanical → Transient Structural Analysis
8. 8
Model Description
ANSYS MechanicalANSYS Mechanical
Assign the Contacts in the model
BondedBonded BondedBonded BondedBonded FrictionlessFrictionless
9. 9
Model Description
ANSYS MechanicalANSYS Mechanical
Assign the Joints in the model
FixedFixed
zoomed viewzoomed view
10. 10
Model Description
ANSYS Mechanical
Named Selections – to apply easily the boundary conditions and the loads to the model
Mesh
• Shared topology for bodies in the same parts
• Mesh relevance: 100% & Fine mesh relevance
center
• Mesh sizing: 2t=32mm for the wave-loaded area
• Mesh sizing: 5t=80mm for the other area,
where t is the thickness of the bulkhead
Mesh metric
graph
Element QualityElement Quality
11. 11
Model Description
ANSYS MechanicalANSYS Mechanical
Loads – Pressure – Time History Graph Boundary Conditions
Zero displacement is assigned at all
the outer edges to show the
connection with the deck.
12. 12
Model Description
ANSYS MechanicalANSYS Mechanical
Solve the model → A Non-linear transient Analysis will be performed
Analysis Settings
• Number of steps: 1
• Initial Time Step: 1e-003 sec
• Minimum Time Step: 1e-004 sec
• Maximum Time Step: 1e-002 sec
• Time Integration: On
• Large Deflection: On
• Nonlinear Controls → Newton-Raphson Option, Force, Moment, Displacement &
Rotation Convergence, Line Search: Program Controlled
&&
14. 14
Results
Equivalent Plastic Strain
A critical value of the plastic strainA critical value of the plastic strain (0.25) is defined according to specific calibration cases.
Buckling of the horizontal stiffeners
An amount of approximately 0.05 of plastic
strain is obtained with this failure mode.
The primary failure mode is tension failuretension failure on the horizontal plating that receives the
wave loads.
Failure ModesFailure Modes
A zone of permanent strain is created where the
machinery deck meets the horizontal plane, close
to the weld and in the vertical zones around the
window.
15. 15
Connections Check
Welded connection: bulkhead-protection base
Bolted Connection: clevis pin-protection base
According to:
Eurocode 3: EN 1993-1-8 (2005), Design of steel structures-Part 1-8: Design of joints, May 2005
16. 16
Conclusion
Finite Element Simulation results show that the maximum plastic strain is less than
the allowable values that are specified by the calibration cases. The non-linear
methods that are used in this analysis dictate specialized checks of plastic
deflections in order to obtain a converged solution.
From the connections check, it is proved that all of the connections are to the
safe side.
The bulkhead, with its stiffeners and girders has adequate structural strength to
withstand the wave pressure.
17. 17
Further Capabilities
Parameters → i.e the thickness of the cover plate of the window
Design Optimization → a combination of key parameters in the analysis
Space Claim → user-friendly working environment, advanced options