Prestressed concrete ,post tensioning ,pre tensioning, where normal concrete can not be used and need of more strength is required this type of concrete are used. Metal bars are replaced by the tendoms which are generally used to create tension in concrete. So because of that beam bends in upward direction and when load is applied it come in normal conditon.
Prestressed concrete structures and its applications By Mukesh Singh GhuraiyaMukesh Singh Ghuraiya
1. What is Prestressed??
2. Principle of Prestressed
3. Method of prestressing
4. Prestressed concrete structures
5. Advantages/application of Prestressed concrete
6. Disadvantages of Prestressed concrete
7. Comparison of RCC and Prestressed Concrete Flat Slabs
Shear, bond bearing,camber & deflection in prestressed concreteMAHFUZUR RAHMAN
This Presentation was presented as a partial fulfillment of Prestressed Concrete Design Lab Course. Behavior & Design of Prestress on above topic is shortly discussed on the presentation. The part "Shear & Shear Design in Prestressed" Concrete was prepared by me. Other topics were prepared by other members of my group. Thanks to all my teachers & friends who helped us in different stages during preparation of the total presentation.
At the beginning of the twentieth century, “Prestressed Concrete” soon became the single most significant new direction in structural engineering according to Billington (2004).
This unique concept gave the engineer the ability to control the actual structural behavior while forcing him or her to dive more deeply into the construction process of the structural material. It gave architects as well as engineers a new realm of reinforced concrete design pushing not only the structural but also the architectural limits of concrete design to a level that neither concrete nor structural steel could achieve. Ordinary reinforced concrete could not achieve the same limits because the new long spans that “Prestressed Concrete” were able to achieve could not be reached with reinforced concrete. Those longer spans required much deeper members, which quickly made reinforced concrete uneconomical. Additionally, steel structures weren’t able to create the same architectural forms that the new “Prestressed Concrete” could.
1.2.1: Prestressed Concrete Concept ,Idea & Designs
P.H.Jackson – 1888 – USA.
The concept of Prestressed Concrete appeared in 1888 when P.H. Jackson was granted the first patent in the United States for Prestressed Concrete design as a method of Prestressed construction in concrete pavement.
Jackson’s idea was perfect, but the technology of high strength steel that exhibited low relaxation characteristics was not yet available. This was the reason Prestressed Concrete was not used as building material in the early years. For example, metallurgists had not yet discovered high strength steel, which combined the needed high compressive forces in a minimal amount of steel with low relaxation characteristics that minimized creep and post-stress deformations in the prestressing steel; therefore, the idea hibernated until Freyssinet reexamined it in the early twentieth century, the first to actively promote prestressed concrete.
MPIL´s key product portfolio includes mainly utility poles for the power market segment. Utility poles are a common feature of our everyday landscape. They support the wires that bring electricity from the power company to our homes and enable our growing network of telephones, televisions, and computers. They are manufactured in various forms as PSCC poles, RCC (Reinforced Cement Concrete) poles and Spun poles. They are usually manufactured as per the standard specifications of the customer.
MPIL´s main business focus lies in manufacturing of PSCC poles. They are basically cement concrete poles which are pre-stressed using steel wires to provide more structural strength. They are manufactured as per standard REC specifications followed by various customer organizations implementing Rural Electrification programs launched by various state government controlled electricity boards.
Our Products are….
• 8.0M/140Kg
• 8.0M/200Kg
• 8.5M/180Kg
• 8.5M/200Kg
• 9.0M/140Kg
• 9.0M/200Kg
• 9.0M/300Kg
• 9.0M/400Kg
• 9.5M/300Kg
• 9.5M/400Kg
• 11.0M/365Kg
Spun Poles & Piles:
Manchukonda Prakasham Industries India Private Limited, a market leader in pre-stressed cement concrete flat poles in India, is planning to diversify into pre-stressed cement concrete spun pole/pile business by setting up a most advanced and state-of-the-art spun pole/pile manufacturing unit near Hyderabad, India. The project will be commissioned on fast track basis and is expected to be operational during the current calendar year 2013.
Unlike the pre-stressed cement concrete flat poles and wooden poles, the spun poles have superior strength and appearance. The increase in strength is achieved through centrifugal spinning with those of pre-stressing and high strength concrete in the manufacturing process. The advanced centrifugal spinning ensures the concrete is compacted into a hard and dense material exhibiting superior strength and excellent finish.
The company will be focusing primarily on the following few application segments to market spun poles:
Power Segment:
• Transmission & Distribution Infrastructure (Power transmission & distribution poles)
• Township Lighting (Street/High-mast lighting & Sports/Yard lighting poles)
• Traction Infrastructure (Electric train traction poles)
Telecom Segment:
• Telecom Tower (Telecom poles)
And for spun piles, following are some of the application segments to be of immediate business focus:
• Foundation Pile (Building/Port/River Structures, Bridges, Retaining Walls)
• Columns (Building Structures, Bridge Piers)
The company is actively looking forward to procure high quality spun pole production machinery and equipments from reputed global vendors for setting up its manufacturing plant to release high quality spun poles or piles into the market at the earliest.
QUALITY:
MPIL has strived for excellence and got the ISO 9001 Certification by QMS.
Prestressed concrete ,post tensioning ,pre tensioning, where normal concrete can not be used and need of more strength is required this type of concrete are used. Metal bars are replaced by the tendoms which are generally used to create tension in concrete. So because of that beam bends in upward direction and when load is applied it come in normal conditon.
Prestressed concrete structures and its applications By Mukesh Singh GhuraiyaMukesh Singh Ghuraiya
1. What is Prestressed??
2. Principle of Prestressed
3. Method of prestressing
4. Prestressed concrete structures
5. Advantages/application of Prestressed concrete
6. Disadvantages of Prestressed concrete
7. Comparison of RCC and Prestressed Concrete Flat Slabs
Shear, bond bearing,camber & deflection in prestressed concreteMAHFUZUR RAHMAN
This Presentation was presented as a partial fulfillment of Prestressed Concrete Design Lab Course. Behavior & Design of Prestress on above topic is shortly discussed on the presentation. The part "Shear & Shear Design in Prestressed" Concrete was prepared by me. Other topics were prepared by other members of my group. Thanks to all my teachers & friends who helped us in different stages during preparation of the total presentation.
At the beginning of the twentieth century, “Prestressed Concrete” soon became the single most significant new direction in structural engineering according to Billington (2004).
This unique concept gave the engineer the ability to control the actual structural behavior while forcing him or her to dive more deeply into the construction process of the structural material. It gave architects as well as engineers a new realm of reinforced concrete design pushing not only the structural but also the architectural limits of concrete design to a level that neither concrete nor structural steel could achieve. Ordinary reinforced concrete could not achieve the same limits because the new long spans that “Prestressed Concrete” were able to achieve could not be reached with reinforced concrete. Those longer spans required much deeper members, which quickly made reinforced concrete uneconomical. Additionally, steel structures weren’t able to create the same architectural forms that the new “Prestressed Concrete” could.
1.2.1: Prestressed Concrete Concept ,Idea & Designs
P.H.Jackson – 1888 – USA.
The concept of Prestressed Concrete appeared in 1888 when P.H. Jackson was granted the first patent in the United States for Prestressed Concrete design as a method of Prestressed construction in concrete pavement.
Jackson’s idea was perfect, but the technology of high strength steel that exhibited low relaxation characteristics was not yet available. This was the reason Prestressed Concrete was not used as building material in the early years. For example, metallurgists had not yet discovered high strength steel, which combined the needed high compressive forces in a minimal amount of steel with low relaxation characteristics that minimized creep and post-stress deformations in the prestressing steel; therefore, the idea hibernated until Freyssinet reexamined it in the early twentieth century, the first to actively promote prestressed concrete.
MPIL´s key product portfolio includes mainly utility poles for the power market segment. Utility poles are a common feature of our everyday landscape. They support the wires that bring electricity from the power company to our homes and enable our growing network of telephones, televisions, and computers. They are manufactured in various forms as PSCC poles, RCC (Reinforced Cement Concrete) poles and Spun poles. They are usually manufactured as per the standard specifications of the customer.
MPIL´s main business focus lies in manufacturing of PSCC poles. They are basically cement concrete poles which are pre-stressed using steel wires to provide more structural strength. They are manufactured as per standard REC specifications followed by various customer organizations implementing Rural Electrification programs launched by various state government controlled electricity boards.
Our Products are….
• 8.0M/140Kg
• 8.0M/200Kg
• 8.5M/180Kg
• 8.5M/200Kg
• 9.0M/140Kg
• 9.0M/200Kg
• 9.0M/300Kg
• 9.0M/400Kg
• 9.5M/300Kg
• 9.5M/400Kg
• 11.0M/365Kg
Spun Poles & Piles:
Manchukonda Prakasham Industries India Private Limited, a market leader in pre-stressed cement concrete flat poles in India, is planning to diversify into pre-stressed cement concrete spun pole/pile business by setting up a most advanced and state-of-the-art spun pole/pile manufacturing unit near Hyderabad, India. The project will be commissioned on fast track basis and is expected to be operational during the current calendar year 2013.
Unlike the pre-stressed cement concrete flat poles and wooden poles, the spun poles have superior strength and appearance. The increase in strength is achieved through centrifugal spinning with those of pre-stressing and high strength concrete in the manufacturing process. The advanced centrifugal spinning ensures the concrete is compacted into a hard and dense material exhibiting superior strength and excellent finish.
The company will be focusing primarily on the following few application segments to market spun poles:
Power Segment:
• Transmission & Distribution Infrastructure (Power transmission & distribution poles)
• Township Lighting (Street/High-mast lighting & Sports/Yard lighting poles)
• Traction Infrastructure (Electric train traction poles)
Telecom Segment:
• Telecom Tower (Telecom poles)
And for spun piles, following are some of the application segments to be of immediate business focus:
• Foundation Pile (Building/Port/River Structures, Bridges, Retaining Walls)
• Columns (Building Structures, Bridge Piers)
The company is actively looking forward to procure high quality spun pole production machinery and equipments from reputed global vendors for setting up its manufacturing plant to release high quality spun poles or piles into the market at the earliest.
QUALITY:
MPIL has strived for excellence and got the ISO 9001 Certification by QMS.
When you need a metal bin, silo or tank manufactured to exact specifications, you can’t source a prefabricated product. What you need is custom metal fabrication. Learn the six-step process we follow at Southern Metal Fabricators and how we create custom-fabricated stainless steel bins, carbon steel tanks and aluminum silos.
Prestressed concrete is a structural material that allows for predetermined, engineering stresses to be placed in members to counteract the stresses that occur when they are subject to loading.
Post-tensioning is a method of reinforcing (strengthening) concrete or other materials with high-strength steel strands or bars, typically referred to as tendons. Post-tensioning applications include office and apartment buildings, parking structures, slabs-on-ground, bridges, sports stadiums, rock and soil anchors, and water-tanks.
>>>Published by Post-Tensioning Institute
These presentations were created during the 2016–2021 B.Arch programme.
Please refer to the references column at the end of each presentation for the information within.
A Stress Ribbon Bridge is a tension structure (similar in many ways to a simple suspension bridge). The suspension cables are embedded in the deck which follows a catenary arc between supports.
Behaviour of Steel Fibre Reinforced Concrete Beam under Cyclic LoadingIOSR Journals
Abstract: This paper describes the influence of steel fibre distribution on the ultimate strength of concrete
beams. An experimental & analytical investigation of the behaviour of concrete beams reinforced with
conventional steel bars and steel fibres under cyclic loading is presented. It is now well established that one of
the important properties of steel fibre reinforced concrete (SFRC) is its superior resistance to cracking and
crack propagation. As a result of this ability to arrest cracks, fibre composites possess increased extensibility
and tensile strength, both at first crack and at ultimate load and the fibres are able to hold the matrix together
even after extensive cracking. The net result of all these is to impart to the fibre composite pronounced post –
cracking ductility which is unheard of in ordinary concrete. The transformation from a brittle to a ductile type
of material would increase substantially the energy absorption characteristics of the fibre composite and its
ability to withstand repeatedly applied, shock or impact loading. Tests on conventionally reinforced concrete
beam specimens, containing steel fibres in different proportions, have been conducted to establish loaddeflection
curves. It was observed that SFRC beams showed enhanced properties compared to that of RC beams
with steel fibres. The experimental investigations are validated with the analytical studies carried out by finite
element models using ANSYS.
Keywords: Steel fiber, concrete, properties, crack, ductility, technology.
Experimental performance of flexural creep behavior of ferrocement slabeSAT Publishing House
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
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.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
3. CONCRETE …
We all know that concrete is strong in compression and weak in tension.This is
reason for providing reinforcement (in the form of steel bars) to resist
tension/tensile force acting on beams/columns/slabs etcetera.
RC structures under service load undergoes deflection causing the bottom of
the beam (tensile zone) to elongate, .causing cracks. Generally, steel bars are
provided to limit the crack widths and resist the tensile force which the concrete
lacks.
4. PRESTRESSED CONCRETE …
Pretressed concrete is a method of overcoming concrete’s natural
Weakness in tension .
It can be used to produce beams, floors bridges with a longer span than is
practical with ordinary reinforced concrete .
7. Cont…
Prestressed concrete was started to be used in building
frames, parking structures, stadiums, railway sleepers,
transmission line poles and other types of structures and
elements. Materials for pre-stress concrete member.
1. Cement
2. Concrete
3. Steel
8. Types of Pre-stressing
1. External or internal pre-stressing : It is based on the location of the
pre-stressing tendons with respect to concrete section.
2. Pre-tensioning or post-tensioning : It based on the sequence of
casting the concrete and applying tension to the tendons.
3. Linear or circular pre-stressing: It based on the shape of the member
pre-stressed.
4. Full, limited or partial pre-stressing : It based on the pre-stressing
force.
5. Uniaxial, biaxial or multi-axial pre-stressing : It based on the
direction of the pre-stressing member.
9. Pre-tensioning:
In this method the tendons (group of wires) are
pulled between two end bulkhead prior to casting
. This pre-stress is later transferred to concrete
due to bonding between the concrete and
tendons .
10.
11. Post-tensioning:
In this process first the casting of structure is done and later
the tensioning is done . Stressing in Post-Tensioning is done
in two-stages in which the order of selection of tendon is
done based on the drawing provided.
12.
13.
14. Fiber Reinforced Concrete :
Fibers are usually used in concrete to control cracking
due to plastic shrinkage and to drying shrinkage. ...
Generally fibers do not increase the flexural strength
of concrete, and so cannot replace moment–resisting or
structural steel reinforcement. Indeed,
some fibers actually reduce the strength of concrete.
15.
16. Factors affecting the Properties of FRC …
1. Volume of fibers
2. Aspect ratio of fiber
3. Orientation of fiber
4. Relative fiber matrix stiffness
17. Types of fiber used in FRC …
1. Steel Fiber Reinforced Concrete
2. Polypropylene Fiber Reinforced (PFR) concrete
3. Glass-Fiber Reinforced Concrete
4. Asbestos fibers
5. Carbon fibers and Other Natural fibers
18. Problems with Steel Fibers …
1. Reduces the workability
2. loss of workability is proportional to volume
concentration of fibers in concrete
3. Higher Aspect Ratio also reduced workability
