Local Bond Stress Slip Behavior Of Reinforcing Bars Embedded In Fiber Reinforced Concrete
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Local Bond Stress Slip Behavior Of Reinforcing Bars Embedded In Fiber Reinforced Concrete
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Author : Marwan Mohamed Hout
language : en
Publisher:
Release Date : 1992
Local Bond Stress Slip Behavior Of Reinforcing Bars Embedded In Fiber Reinforced Concrete written by Marwan Mohamed Hout and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Fiber-reinforced concrete categories.
This study summarizes experimental results of the local bond stress-slip relationship of reinforcing bars embedded in fiber reinforced concrete (FRC). More than 70 bond specimens were tested and the effect of several parameters on the local bond stress-slip behavior was investigated. These include, size of reinforcing bar (#6 and #8); type of fibers (hooked steel, polypropylene); volume fraction of fibers Vf (between 0.9% and 1.4ft for the steel fibers, 1.5% for the polypropylene fibers); type of specimen (pullout, beam); and confinement (confined, unconfined). Whereas the primary emphasis was on the monotonic local bond stres3-slip response, some specimens were tested under large slip reversals to study the effect of fibers on the cyclic bond stress-slip behavior. The results showed that the addition of fibers to concrete matrixes improves the bond characteristics of ordinary reinforcing bar3. For specimens in which bond failure was by pull-out, adding steel fibers in 2% by volume fraction increased the maximum local bond resistance by about 15%. However, the intrinsic shape of the local bond stre33-slip behavior does not change in comparison with conventional concrete. Furthermore, the addition of fibers to concrete matrixes does not seem to influence the stiffness degradation characteristics of the local bond stress-slip response under cyclic 1oading compared to conventiona1 confined concrete reported in technical literature.
Local Bond Stress Slip Relationship Of Reinforcing Bars Embedded In Fiber Reinforced Concrete Under Splitting Type Failure
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Author : Walid Jalkh
language : en
Publisher:
Release Date : 1993
Local Bond Stress Slip Relationship Of Reinforcing Bars Embedded In Fiber Reinforced Concrete Under Splitting Type Failure written by Walid Jalkh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Reinforced concrete categories.
This study summarizes experimental results of the local bond stress-slip response of reinforcing bars embedded in fiber reinforced concrete (FRC) under splitting type failure. Pullout specimens were tested to study the effect of several parameters, namely, type, volume fraction, and aspect ratio of fibers, concrete cover to reinforcing bars (or splitting area surrounding the reinforcing bar), and size of reinforcing bar. The experimental results showed that the major contribution of fibers is in the post-splitting range. As compared to plain concrete, the bond behavior of fiber reinforced concrete is more ductile inasmuch as the post-splitting bond stresses are increased. This increase is function of the fiber reinforcing index and of the fiber bond characteristics. The results from the current study were combined with other results reported in technical literature and used to develop a model to describe the bond stress-slip relationship of reinforcing bars embedded in plain and FRC under splitting type failure. The model accounts for all of the important parameters that tend to influence the bond characteristics of reinforcing bar3 as observed in the experiment. It should be mentioned that this study consists the second pact of a two-phase experimental program dealing with the local bond stress-slip characteristics of reinforcing bars embedded in fiber reinforced concrete. While this current phase concentrates on the splitting type of failure, the first part of the study (Ref. 4) emphasized pullout failure.
Bond Behaviour Of Steel Reinforcing Bars Embedded In Ultra High Performance Steel Fiber Reinforced Concrete
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Author : Elisabeth Rita Saikali
language : en
Publisher:
Release Date : 2019
Bond Behaviour Of Steel Reinforcing Bars Embedded In Ultra High Performance Steel Fiber Reinforced Concrete written by Elisabeth Rita Saikali and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Ultra-High-Performance Steel Fiber Reinforced Concrete (UHP-SFRC) is an emerging concrete considered as an optimal, durable material that can substitute conventional concrete owing to its distinct fresh and hardened properties. Thus, it is essential to understand the mechanism of stress transfer between this concrete and conventional reinforcement that permits the composite action of both materials. A four-point bending test program (FPBT) was arranged and conducted on 19 beams designed for the bond development to occur in the constant moment region along a short embedment length in order to achieve a uniform distribution of bond stresses, enabling measurement of bond strength through reverse engineering of beam strength and deformation. Additional material testing was conducted on prisms under 4-point loading in order to extract the mechanical properties for all material mixes considered. The bond-specimens failed either by pullout or by cone formation with minimal deterioration of the concrete cover, illustrating the high confinement provided by the novel concrete surrounding the bar in tension. The bond strength was determined to be directly proportional to the tensile strength capacity of the design mix, where for the strongest material the bond strength was approximately 30 MPa. Moreover, the test results indicated a very ductile flexural beam response accompanied by significant mid-span deflection reaching 27 mm and substantial bar-slip values attaining 19 mm. Different UHP-SFRC mixes, concrete covers, and embedment lengths were considered. A numerical model was developed to simulate the FPBT using a nonlinear finite element analysis platform, VecTor2, with the ability to model this novel concrete. This high bond strength provided by the concrete cover enables a significant reduction in the design development length as compared to what is used today for conventional concrete.
Bond Strength Characteristics Of Deformed Reinforcing Steel Bars Embedded In Sifcon Steel Bars Concrete
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Author : ALI MORSI HAMZA
language : en
Publisher:
Release Date : 1992
Bond Strength Characteristics Of Deformed Reinforcing Steel Bars Embedded In Sifcon Steel Bars Concrete written by ALI MORSI HAMZA and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
monitored and the modes of bond failure were determined.
Bond Of Reinforcement In Concrete
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Author : fib Fédération internationale du béton
language : en
Publisher: fib Fédération internationale du béton
Release Date : 2000-01-01
Bond Of Reinforcement In Concrete written by fib Fédération internationale du béton and has been published by fib Fédération internationale du béton this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-01-01 with Technology & Engineering categories.
"In 1993, the CEB Commission 2 Material and Behavior Modelling established the Task Group 2.5 Bond Models. It's terms of reference were ... to write a state-of-art report concerning bond of reinforcement in concrete and later recommend how the knowledge could be applied in practice (Model Code like text proposal)... {This work} covers the first part ... the state-of-art report."--Pref.
Guide For The Design And Construction Of Concrete Reinforced With Fiber Reinforced Polymer Bars
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Author : ACI Committee 440
language : en
Publisher:
Release Date : 2003
Guide For The Design And Construction Of Concrete Reinforced With Fiber Reinforced Polymer Bars written by ACI Committee 440 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Fiber-reinforced concrete categories.
Local Bond Between A Reinforcing Bar And Concrete Under High Intensity Reversed Cyclic Load
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Author : Marcos P. Loizias
language : en
Publisher:
Release Date : 1983
Local Bond Between A Reinforcing Bar And Concrete Under High Intensity Reversed Cyclic Load written by Marcos P. Loizias and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Reinforced cement categories.
Investigation Of The Bond Behavior Of Steel Reinforcement Bars Embedded In Ultra High Performance Concrete Under Static Loads Using Finite Element Modeling
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Author : Manish Roy
language : en
Publisher:
Release Date : 2019
Investigation Of The Bond Behavior Of Steel Reinforcement Bars Embedded In Ultra High Performance Concrete Under Static Loads Using Finite Element Modeling written by Manish Roy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Electronic dissertations categories.
The bond properties of reinforcement bars (rebar) embedded in concrete depends on the tensile behavior of the surrounding material and its capability of resisting micro cracks. Since the tensile behavior of Ultra High Performance Concrete (UHPC) is dominated by the amount and the orientation of fibers as well as the type of fibers, an effort has been made in this study to investigate the influence of the fiber volume fraction () and the fiber orientation on the bond behavior of steel rebar embedded in UHPC under a static loading condition using finite element simulation. Owing to the inclusion of discrete fibers, the characteristic of UHPC is highly anisotropic even at a macro level and it is important that the material model of UHPC captures that anisotropy properly. While modeling fibers discretely is time consuming and involves a lot of computational power, the present study proposes a computationally efficient way of modeling UHPC. In this approach, UHPC is considered as a composite material with the matrix modeled as a homogeneous material and the fibers modeled as smeared reinforcement. The directional vector of the smeared reinforcement represents the orientation of the fibers inside the matrix. ATENA, a finite element program, is used for this purpose. The material properties of the fibers are calibrated using the stress-stain data obtained from uniaxial direct tensile tests of UHPC. The calibrated fiber properties are then used to model pullout tests of a rebar embedded in UHPC. The bond stress versus slip properties of the rebar are validated with the experimental pullout test results. The calibrated rebar properties along with the fiber properties are then used to model uniaxial direct tensile tests of UHPC with embedded rebar. Once the tensile test model of the composite is validated using the experimental data, parametric studies are conducted to determine the effect of and fiber orientation on the uniaxial tensile behavior of rebar-reinforced UHPC. Based on the parametric studies, the dependence of the structural ductility on is discussed and a recommendation for the minimum strain to attain ductility is made.
Bond Of Reinforcemen Under Controlled Confinement
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Author :
language : en
Publisher:
Release Date : 1991
Bond Of Reinforcemen Under Controlled Confinement written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
Twelve specimens were tested to determine the local bond stress-slip characteristics of a No. 6 rebar embedded in a 3-inch diameter concrete cylinder. Radial confining stress around the concrete specimen and radial deformation were assumed to be fundamental variables, together with bond stress and slip, needed to properly describe the interface behavior. Configuration independent bond stress-slip, relationships for a short five-lug embedded length were obtained for various degrees of confining pressure. Maximum bond stresses could be increased almost threefold by increasing the confining stress from 500 to 4500 psi at the bar level. Two types of No. 6 bars with different deformations were investigated. In many reinforced concrete structures, the mode of failure is tensile cracking of the concrete. Where it is important to predict failure or severe damage, proper representation of bond is crucial. Principal gain from inclusion of actual bond-slip properties in the interface between steel rebar and concrete is a realistic prediction of cracking. The spacing, width, and extent of cracks in reinforced concrete are dependent on the assumed bond-slip characteristics. Critical Navy reinforced concrete structures, such as missile test cells and graving drydocks, are designed to withstand large deformations under severe blast and strong-motion earthquake loads. The development of design criteria for these structures requires evaluation of their response where severe deterioration of steel concrete interfaces takes place.
Bond Stress Slip Characteristics Of Frp Rebars
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Author : L. Javier Malvar
language : en
Publisher:
Release Date : 1994
Bond Stress Slip Characteristics Of Frp Rebars written by L. Javier Malvar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Concrete categories.