Behavior Of Frp Strengthened Concrete Panel Elements Subjected To Pure Shear
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Behavior Of Frp Strengthened Concrete Panel Elements Subjected To Pure Shear
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Author : S. M. Mehdi Zomorodian
language : en
Publisher:
Release Date : 2015
Behavior Of Frp Strengthened Concrete Panel Elements Subjected To Pure Shear written by S. M. Mehdi Zomorodian and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Civil engineering categories.
Several investigations have revealed that many aging civil engineering structures such as highway bridges are structurally deficient and need repairs and/or retrofitting. Among various solutions, fiber reinforce polymer (FRP) composites have shown a promising solution and have been increasingly used in rehabilitation and strengthening of reinforced concrete (RC) structures. Although, researchers have devoted a tremendous effort on studies related to FRP shear strengthening of RC structures, the state of knowledge shows that the problem is not fully resolved and there are still controversies in the prediction of shear behavior in the presence of FRP. To predict the increase in shear capacity due to FRP strengthening, several analytical models have been proposed. However, when these models are compared using existing experimental database, they show inconsistencies and large scatter in the prediction. This is due in part to the high level of complexity associated with the shear behavior, but more importantly due to the lack of rational constitutive models for FRP shear strengthened elements. This research study aims at establishing the shear constitutive behavior of externally bonded FRP strengthened RC elements subjected to pure shear through experimental investigations and development of associated analytical and finite element models. In order to evaluate such behavior, at the first part of the research, a series of full-scale FRP strengthened RC panels were constructed and tested under pure shear stress field using the University of Houston’s state of the art panel tester. It was found that application of FRP sheets increased the shear capacity of RC panels. Also, the shear behavior of FRP strengthened RC members is influenced mainly by the FRP stiffness, wrapping scheme, and the internal shear reinforcement. Based on the test results, the Softened Membrane Model (SMM), which was developed for reinforced concrete, was modified and extended for application to FRP strengthened RC members. The second part of this research involved the development of a computer program for analysis of FRP strengthened RC structures. The constitutive laws of FRP strengthened RC members, developed through previous research at UH, have been implemented into the finite element frame work OpenSees to predict the behavior of FRP strengthened RC panels and beams under monotonic loading. The analytical model was tested and validated using existing experimental data. Furthermore, to investigate the serviceability conditions in FRP strengthened RC structures, the crack characteristics of a series of full-scale tensile tests of FRP strengthened RC prisms and test panels have been monitored by using a digital image correlation system. The experimental results were used to calibrate a newly developed equation to calculate crack spacing and crack width in RC elements externally strengthened with FRP.
Material Laws Of Frp Strengthened Reinforced Concrete Under Uniaxial Tension And Biaxial Tension Compression Stress Fields
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Author : Guang Yang
language : en
Publisher:
Release Date : 2015
Material Laws Of Frp Strengthened Reinforced Concrete Under Uniaxial Tension And Biaxial Tension Compression Stress Fields written by Guang Yang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Civil engineering categories.
Well established analytical models and design guidelines are already available for analyzing and designing FRP strengthened structures under flexural and axial-confinement actions. However, the understanding of the behavior of such members under in-plane stress field remains a subject of on-going discussion among several researchers and practitioners. Several analytical models have been proposed to predict the gain and upgrade of shear capacity due to FRP strengthening, among which, most models resulted in large discrepancies and produced large scatter when compared to experimental database. This is due to the lack of accurate constitutive models for strengthened reinforced concrete (RC) with FRP (FRP-RC) members. An efficient method to study the overall response of an RC member is to identify the characteristic behavior and the contribution of each material constituting the structure, the behavior of that specific element can be predicted by taking into account the inherent characteristics and material laws of the constituents that leads to understanding the global shear response of the structure. As a first step of developing a shear model of FRP-RC elements, constitutive laws of each material component, namely concrete, steel reinforcement, and FRP sheets were studied in this research project through experimental and analytical investigations. Thirteen full-scale prismatic specimens and six full-scale panels were tested using the Universal Panel Tester (UPT) to study the stress-strain relationships of concrete, steel and FRP in tension as well as concrete in compression and the Poisson effect resulting from the biaxial loading. The results indicate that compared to the un-strengthened RC element, the presence of the externally bonded FRP material typically alters the main characteristics of the stress-strain relationships for each components in FRP-RC element. These newly developed material laws will be used to further develop a model to predict the behavior of FRP strengthened RC elements subjected to shear and torsion. The results from both experimental and analytical study in this research project will provide a promising contribution to the prediction of the behavior of FRP-RC members under shear that will ultimately improve the accuracy of the available design guidelines.
Post Cracking Analysis Of Reinforced Concrete Panels Including Tension Stiffening
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Author :
language : en
Publisher:
Release Date : 1990
Post Cracking Analysis Of Reinforced Concrete Panels Including Tension Stiffening written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
In finite element analysis of reinforced concrete structures, the effect of bond forces between concrete and reinforcement, referred to as tension stiffening, is discussed. To account for ths phenomenon, the post-cracking constitutive model for concrete is modified by assigning a linear strain softening branch to its stress-strain curve in the tensil stress direction. For analyzing orthogonally reinforced concrete panels, a simple procedure for determining the termination strain of the softening branch is then developed. Appropriate constitutive models for steel and uncracked concrete along with the ost-cracking model to simulate the behavior of cracked reinforced concrete are implemented in a finite element program. Three othogonally reinforced concrete test panels subjected to pure shear loadings causing inclined cracking are analyzed. It is shown that the adopted numerical procedures are capable of predicting the post-crackingresponses, ultimate capacities, and modes of failure for the analyzed panels with good accuracy. The capabilities of the employed post-cracking model to simulate the crack shifting behavior observed during testing of a highly anisotropically reinforced panel is also demonstrated.
Behavior Of Reinforced Concrete Slabs Subjected To Combined Punching Shear And Biaxial Tension
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Author : Wen-chen Jau
language : en
Publisher:
Release Date : 1982
Behavior Of Reinforced Concrete Slabs Subjected To Combined Punching Shear And Biaxial Tension written by Wen-chen Jau and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Concrete slabs categories.
Fiber Reinforced Plastic Frp Reinforcement For Concrete Structures
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Author : David A. Hensher
language : en
Publisher: Elsevier
Release Date : 2016-01-22
Fiber Reinforced Plastic Frp Reinforcement For Concrete Structures written by David A. Hensher and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-01-22 with Technology & Engineering categories.
The use of fiber reinforced plastic (FRP) composites for prestressed and non-prestressed concrete reinforcement has developed into a technology with serious and substantial claims for the advancement of construction materials and methods. Research and development is now occurring worldwide. The 20 papers in this volume make a further contribution in advancing knowledge and acceptance of FRP composites for concrete reinforcement. The articles are divided into three parts. Part I introduces FRP reinforcement for concrete structures and describes general material properties and manufacturing methods. Part II covers a three-continent perspective of current R&D, design and code implementations, and technical organizations' activities. Part III presents an in-depth description of commercially-available products, construction methods, and applications. The work is intended for engineers, researchers, and developers with the objective of presenting them with a world-wide cross-section of initiatives, representative products and significant applications.
Aci Structural Journal
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Author :
language : en
Publisher:
Release Date : 2001
Aci Structural Journal written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Concrete categories.
Punching Shear Behaviour Of Frp Reinforced Concrete Interior Slab Column Connections
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Author : Ahmed Sayed
language : en
Publisher:
Release Date : 2015
Punching Shear Behaviour Of Frp Reinforced Concrete Interior Slab Column Connections written by Ahmed Sayed and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Flat slab-column connections are common elements in reinforced concrete (RC) structures such as parking garages. In cold weather regions, these structures are exposed to de-icing salts and aggressive environments. Using fiber reinforced polymer (FRP) bars instead of steel in such structures will overcome the corrosion problems associated with steel reinforcement. However, the available literature shows few studies to evaluate the behaviour of FRP-RC interior slab-column connections tested mainly under concentric loads, which seldom occurs in a real building. The main objectives of this research are to deal with this gap by investigating the behaviour of full-scale glass (G) FRP-RC interior slab-column connections subjected to eccentric load and to provide design recommendations for such type of connections. This study consisted of two phases, experimental and analytical. The experimental phase included the construction and testing of ten full-scale interior slab-column connections. The parameters investigated in the experimental phase were flexural reinforcement ratio, concrete compressive strength, type of the reinforcement, moment-to-shear ratio and the spacing between the shear stud reinforcement. Test results revealed that increasing the GFRP reinforcement ratio or the concrete strength increased the connection capacity. Moreover, compared to the control steel-RC specimen, the GFRP-RC connection with similar reinforcement rigidity showed comparable capacity and deflection at failure. Also, increasing the moment-to-shear ratio resulted in a reduction in the vertical load capacity, while using the shear stud reinforcement enhanced the strength up to 23%. In the analytical phase, a 3-D finite element model (FEM) was constructed using specialized software. The constructed FEM was able to predict the experimental results within a reasonable accuracy. The verified FEM was then used to conduct a parametric study to evaluate the effects of perimeter-to-depth ratio, column aspect ratio, slab thickness and a wide range of flexural reinforcement ratio. The numerical results showed that increasing the reinforcement ratio increased the connection capacity. In addition, increasing the perimeter-to-depth ratio and slab thickness reduced the punching shear stresses at failure, while, the effect of the column rectangularity diminished for a ratio greater than three. Moreover, the results showed prominent agreement with the experimental results from literature.
Developments In Fiber Reinforced Polymer Frp Composites For Civil Engineering
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Author : Nasim Uddin
language : en
Publisher: Elsevier
Release Date : 2013-05-15
Developments In Fiber Reinforced Polymer Frp Composites For Civil Engineering written by Nasim Uddin and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-05-15 with Technology & Engineering categories.
The use of fiber-reinforced polymer (FRP) composite materials has had a dramatic impact on civil engineering techniques over the past three decades. FRPs are an ideal material for structural applications where high strength-to-weight and stiffness-to-weight ratios are required. Developments in fiber-reinforced polymer (FRP) composites for civil engineering outlines the latest developments in fiber-reinforced polymer (FRP) composites and their applications in civil engineering. Part one outlines the general developments of fiber-reinforced polymer (FRP) use, reviewing recent advancements in the design and processing techniques of composite materials. Part two outlines particular types of fiber-reinforced polymers and covers their use in a wide range of civil engineering and structural applications, including their use in disaster-resistant buildings, strengthening steel structures and bridge superstructures. With its distinguished editor and international team of contributors, Developments in fiber-reinforced polymer (FRP) composites for civil engineering is an essential text for researchers and engineers in the field of civil engineering and industries such as bridge and building construction. Outlines the latest developments in fiber-reinforced polymer composites and their applications in civil engineering Reviews recent advancements in the design and processing techniques of composite materials Covers the use of particular types of fiber-reinforced polymers in a wide range of civil engineering and structural applications
Ceb Fip Model Code 1990 Final Draft Chapters1 3
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Author : FIB – International Federation for Structural Concrete
language : en
Publisher: FIB - International Federation for Structural Concrete
Release Date : 1991-07-01
Ceb Fip Model Code 1990 Final Draft Chapters1 3 written by FIB – International Federation for Structural Concrete and has been published by FIB - International Federation for Structural Concrete this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991-07-01 with Technology & Engineering categories.
Development Of Seismic Strengthening And Retrofit Strategies For Critical Facilities Using Engineered Cementitious Composite Materials
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Author : Keith Evan Kesner
language : en
Publisher:
Release Date : 2003
Development Of Seismic Strengthening And Retrofit Strategies For Critical Facilities Using Engineered Cementitious Composite Materials written by Keith Evan Kesner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Cement composites categories.