Shear Performance Of Heavily Reinforced High Strength Concrete Coupling Beams

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Shear Performance Of Heavily Reinforced High Strength Concrete Coupling Beams

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Author : Andrew Walter Fisher
language : en
Publisher:
Release Date : 2016

Shear Performance Of Heavily Reinforced High Strength Concrete Coupling Beams written by Andrew Walter Fisher and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.

Studies On Shear Strength Of High Performance Concrete Beams

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Author : P. Y. L. Kong
language : en
Publisher:
Release Date : 1997

Studies On Shear Strength Of High Performance Concrete Beams written by P. Y. L. Kong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Bars (Engineering) categories.

Experimental Study On Seismic Performance Of Reinforced Concrete Coupling Beams And Rectangular Squat Walls With Innovative Reinforcement Configurations

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Author : Poorya Hajyalikhani
language : en
Publisher:
Release Date : 2016

Experimental Study On Seismic Performance Of Reinforced Concrete Coupling Beams And Rectangular Squat Walls With Innovative Reinforcement Configurations written by Poorya Hajyalikhani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Concrete beams categories.

Reinforced concrete core walls, coupled by diagonally reinforced coupling beams (DCBs), are a very efficient seismic force resisting system for medium- to high-rise buildings. The diagonal reinforcing bars in DCBs are most effective when the beam has a span-to-depth ratio, ln/h, less than 2. Modern construction, due to architectural requirements, typically requires span-to-depth ratios between 2.4 to 4, which leads to a very shallow angle of inclination of the diagonal reinforcement (generally between 10 to 20 degrees). The lower angles of inclination, combined with the detailing requirements specified in ACI 318, results in reinforcement congestion as well as design and construction difficulties. These issues with DCBs can be considerably minimized by utilizing an innovative and simplistic reinforcing scheme as investigated in this study. This reinforcement scheme consists of two separate cages similar to those used for typical beams in RC special moment frames. The proposed coupling beam has high elastic stiffness and acts like a conventional coupling beam under small displacements. Upon large displacements, cracks begin developing at the mid-span and mid-height of the beams where the narrow gap is located, gradually propagating towards the beam's ends. The cracks eventually separate the coupling beam into two slender beams where each has nearly twice the aspect ratio of the original coupling beam. This essentially transforms the shear-dominated behavior into a flexure-dominated behavior, as conventional slender beams. Because damage initiates from the center of the beam; then spreads towards the ends, the beam's ends maintain their integrity even under very large displacements, thereby eliminating the sliding shear failure at the beam-to-wall interface. Preliminary testing results on half-scale coupling beam specimens with span-to-depth ratio of 2.4 showed that coupling beams with the proposed reinforcement scheme were able to sustain high shear stresses and large rotations before strength degradation occurred. Subsequently, six rectangular squat wall specimens with height-to-length ratio 0.5 and 1, which were designed based the second innovative design concept using discrete confining cages to reinforce the web of the walls, were tested under lateral displacement reversals. Each wall consisted of several separate cages similar to those used for typical beams in RC special moment frames. The response of squat wall specimens showed very high shear strength and stiffness, while maintain adequate ductility due to well confinement of the wall.

Flexural And Shear Performance Of High Strength Lightweight Reinforced Concrete Beams

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Author : Ahmed Naamah Almousawi
language : en
Publisher:
Release Date : 2011

Flexural And Shear Performance Of High Strength Lightweight Reinforced Concrete Beams written by Ahmed Naamah Almousawi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

Shear Capacity Of Steel Plate Reinforced Concrete Coupling Beams

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Author : Pak Cheung Cheng
language : en
Publisher:
Release Date : 2004

Shear Capacity Of Steel Plate Reinforced Concrete Coupling Beams written by Pak Cheung Cheng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Concrete beams categories.

Large Scale Testing Of Steel Reinforced Concrete Src Coupling Beams Embedded Into Reinforced Concrete Structural Walls

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Author : Christopher John Motter
language : en
Publisher:
Release Date : 2014

Large Scale Testing Of Steel Reinforced Concrete Src Coupling Beams Embedded Into Reinforced Concrete Structural Walls written by Christopher John Motter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.

Reinforced concrete structural walls provide an efficient lateral system for resisting seismic and wind loads. Coupling beams are commonly used to connect adjacent collinear structural walls to enhance building lateral strength and stiffness. Steel-Reinforced Concrete (SRC) coupling beams provide an alternative to reinforced concrete coupling beams, diagonally-reinforced for shorter spans and longitudinally-reinforced for longer spans, and offer potential advantages of reduced section depth, reduced congestion at the wall boundary region, improved degree of coupling for a given beam depth, and improved deformation capacity. Four large-scale, flexure-yielding, cantilever SRC coupling beams embedded into reinforced concrete structural walls were tested by applying quasi-static, reversed-cyclic loading to the coupling beam (shear) and the top of the wall (moment, shear, and constant axial load) to create cyclic tension and compression fields across the embedment region. The primary test variables were the structural steel section embedment length, beam span length (aspect ratio), quantities of wall boundary longitudinal and transverse reinforcement, and applied wall loading (moment, shear, and axial load). Based on test results, long embedment length, sufficient wall boundary reinforcement, and low-to-moderate wall demands across the embedment region are all associated with favorable coupling beam performance, characterized by minimal pinching and strength degradation in the load-deformation response and plastic hinge formation at the beam-wall interface with a lack of damage (plasticity) in the embedment region. The variation in aspect ratio was not found to significantly affect performance. Detailed design and modeling recommendations for steel reinforced concrete (SRC) coupling beams are provided for both code-based (prescriptive) design and alternative (non-prescriptive) design. For both code-based and alternative design, modeling a rigid beam for flexure and shear deformations with rotational springs at the beam-wall interfaces is recommended for stiffness, as test results indicate that the majority of the coupling beam deformations were associated with interface slip/extension. Alternative stiffness modeling recommendations are provided, in which an effective bending stiffness that accounts for the aspect ratio or beam length is used instead of interface rotational springs. A capacity design approach, in which the provided embedment strength exceeds the expected beam strength, is recommended for determining the required embedment length of the steel section into the structural wall. Recommendations for computing the nominal and expected (upper bound) flexure and shear strengths are provided. For alternative design, additional parameters are provided to define the strength and deformation capacity (to complete the backbone relations) and to address cyclic degradation for each of the test beams.

Shear Behaviour Of High Strength Concrete Beams

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Author : Li Hua He
language : en
Publisher:
Release Date : 1998

Shear Behaviour Of High Strength Concrete Beams written by Li Hua He and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.

Experimental Study Of Reinforced Concrete Coupling Beams With Axial Restraint

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Author : Bahaa Ahmad Burhan Al-Khateeb
language : en
Publisher:
Release Date : 2021

Experimental Study Of Reinforced Concrete Coupling Beams With Axial Restraint written by Bahaa Ahmad Burhan Al-Khateeb and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Concrete beams categories.

Coupled shear walls are a lateral load resisting system used in buildings to resist seismic and wind loads. In coupled walls, coupling beams span between adjacent shear walls and are typically located at floor level. Coupling beams are designed to yield and form plastic hinges before the wall piers. Damage patterns observed after the 2010-2011 Canterbury earthquake sequence in New Zealand showed instances in which coupled walls did not behave as intended in design, as plastic hinges formed at the base of the wall piers but not at the beam ends. The Canterbury Earthquakes Royal Commission suggested that this undesirable response may have been caused by coupling beam axial restraint from walls and floors increasing the strength of the coupling beams.To better understand the effect of axial restraint on coupling beam behavior, seven one-half-scale reinforced concrete coupling beams were designed using ACI 318-19 and were constructed and tested. The main test variables were span-to-depth ratio, reinforcement configuration (conventional or diagonal), primary reinforcement ratio and bar diameter, and level of axial restraint. Six beams consisted of three identical pairs, with the two beams in each pair tested at a different level of constant stiffness axial restraint.Test results indicated that axial restraint, which is not included in the ACI 318-19 equation for nominal shear strength of diagonally reinforced coupling beams, increased the beam strength. Axial restraint also influenced the load-displacement responses of the beams and the observed damage patterns. The conventionally reinforced beams were observed to yield in shear, while damage concentrated at the ends of the diagonally reinforced beams. The onset of significant strength degradation in the diagonally reinforced beams was associated with buckling of diagonal reinforcement rather than crushing of confined concrete, such that variation in axial compression on identical pairs of beam did not lead to a significant difference in deformation capacity. Test beams with #6 diagonal reinforcement had improved deformation capacity over those with #4 diagonal reinforcement, due to the influence of the ratio of transverse reinforcement spacing to diagonal bar diameter (s/db) on bar buckling.

Shear Capacity And Flexural Ductility Of Reinforced High And Normal Strength Concrete Beams

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Author : Md Shahidul Islam
language : en
Publisher: Open Dissertation Press
Release Date : 2017-01-27

Shear Capacity And Flexural Ductility Of Reinforced High And Normal Strength Concrete Beams written by Md Shahidul Islam and has been published by Open Dissertation Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-01-27 with categories.

This dissertation, "Shear Capacity and Flexural Ductility of Reinforced High- and Normal-strength Concrete Beams" by Md Shahidul, Islam, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3121444 Subjects: Concrete beams - Testing High strength concrete - Testing Shear (Mechanics)

Shear Capacity Of Beams Of Reinforced High Performance Concrete

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Author : Henrik Gabrielsson
language : en
Publisher:
Release Date : 1993

Shear Capacity Of Beams Of Reinforced High Performance Concrete written by Henrik Gabrielsson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.