scholarly journals Theoretical Evaluation Equation for Capacities of Beam Action in Shear Resistance Mechanisms of RC Beams Reflecting Dowel Action of Main Reinforcements

2021 ◽  
Vol 19 (9) ◽  
pp. 1025-1039
Author(s):  
Yuta Yamada
Keyword(s):  
Shear Resistance ◽  
Resistance Mechanisms ◽  
Rc Beams ◽  
Theoretical Evaluation ◽  
Dowel Action

Influence of Stirrup Corrosion on Shear Strength of RC Beams

2012 ◽  
Vol 204-208 ◽  
pp. 3287-3293
Author(s):  
Xin Xue ◽  
Hiroshi Seki ◽  
Yu Song
Keyword(s):  
Shear Strength ◽  
Mass Loss ◽  
Local Maximum ◽  
Shear Resistance ◽  
Shear Behavior ◽  
Shear Capacity ◽  
Maximum Mass ◽  
Rc Beams ◽  
Load Carrying ◽  
Maximum Mass Loss

There have been few reports on shear behavior of reinforced concrete (RC) beams with corroded stirrups, and the influence of stirrup corrosion has yet to be identified. Given this background, experience was carried out to investigate the shear behavior of RC beams containing corroded stirrups. Investigation results indicate that if the percentage local maximum mass loss is below 35%, there is little influence on the load-carrying mechanism. The concrete shear resistance seems to change little and the shear capacity can be calculated by just taking into consideration the reduction in stirrup shear resistance. It is also found that the anchorage conditions of the stirrups have a predominant influence on the shears of RC beams.

Study on Seismic Behavior of Vertical Connection in Prefabricated Reinforced Concrete Structures

2011 ◽  
Vol 250-253 ◽  
pp. 1385-1394
Author(s):  
Guo Hua Song ◽  
Dong Wei Wang ◽  
Bing Kang Liu
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Concrete Structures ◽  
Shear Resistance ◽  
Repeated Loading ◽  
Reinforced Concrete Structures ◽  
Test Results ◽  
Dowel Action ◽  
Cycle Loading ◽  
Good Agreement

The paper attempts to research the seismic behavior and mechanical mechanisms under repeated low-cycle loading of vertical connections in prefabricated reinforced concrete structures. Eighteen specimens were designed and tested, the test process and the mechanical mechanisms are studied, the seismic behavior of connections is analyzed, and the shear resistance formulas are proposed. The theoretical values based on proposed formulas are good agreement with test results. Under repeated loading, the shear resistance decreases, the connection ductility increases with connecting bar, but decreases with connection width. However, all the connections fail crisply with poor ductility. At sudden-cracking, the shear resistance increases with connecting bar, but changes nonlinearly with connection width. The resistance is composed of attributions of mechanism of diagonal-compressive column (MDCC) and mechanism of compressive friction action (MCFA). After sudden-cracking, the shear resistance is provided by weakened MDCC and dowel action of connecting bars (DACB). It increases with connecting bar and connection width.

Shear resistance of self-consolidating concrete beams — experimental investigations

2005 ◽  
Vol 32 (6) ◽  
pp. 1103-1113 ◽  
Author(s):  
M Lachemi ◽  
K M.A Hossain ◽  
V Lambros
Keyword(s):  
High Performance ◽  
Failure Modes ◽  
Coarse Aggregate ◽  
High Performance Concrete ◽  
Maximum Size ◽  
Shear Resistance ◽  
Resistance Mechanisms ◽  
Experimental Investigations ◽  
Self Consolidating Concrete ◽  
Aggregate Interlock

Self-consolidating concrete (SCC) is a new generation of high performance concrete known for its excellent deformability and high resistance to segregation and bleeding. Lack of information regarding in situ properties and structural performance of SCC is one of the main barriers to its acceptance in the construction industry. There is some concern among researchers and designers that SCC may not be strong enough in shear because of some uncertainties in mechanisms resisting shear — notably the aggregate interlock mechanism. Because of the presence of comparatively smaller amount of coarse aggregates in SCC, the fracture planes are relatively smooth as compared with normal concrete (NC) that may reduce the shear resistance of concrete by reducing the aggregate interlock between the fracture surfaces. The paper compares the shear resistance of SCC and NC based on the results of an experimental investigation on 18 flexurally reinforced beams without shear reinforcements. The test parameters include concrete type, maximum size of coarse aggregate, coarse aggregate content, and beam shear span-to-depth ratio. Shear strength, shear ductility, crack patterns, and failure modes of all experimental beams are compared to analyze the shear resistance mechanisms of SCC and NC beams in both pre- and post-cracking stages. The recommendations of this paper can be of special interest to designers considering the use of SCC in structural applications.Key words: self-consolidating concrete, shear resistance, shear resistance factor, aggregate interlock, dowel action.

scholarly journals Interaction between Internal Shear Reinforcement and External FRP Systems of RC Beams: Experimental Study

2017 ◽  
Vol 11 (1) ◽  
pp. 143-152
Author(s):  
Wee Teo ◽  
Kilian Lau Meow Hing ◽  
Mohd Shahir Liew
Keyword(s):  
Concrete Beams ◽  
Research Effort ◽  
Shear Resistance ◽  
Rc Beams ◽  
Shear Reinforcement ◽  
Shear Strengthening ◽  
Modes Of Failure ◽  
Externally Bonded ◽  
Good Agreement ◽  
Do So

Extensive research effort has been conducted on the shear strengthening of reinforced concrete (RC) beams with externally bonded FRP systems. However, there are still few aspects on their behaviour that are yet to be fully understood. One of them is the effect of shear interaction between internal transverse shear reinforcement and the external FRP systems. This paper is intended to study experimentally the interaction between these two shear reinforcement components. To do so, a total of five concrete beams were assembled in this investigation. All beams were properly instrumented in order to obtain as much data as possible. Four beams were externally strengthened with FRP with different strengthening and wrapping schemes. Their influence and interaction with the internal transverse stirrups in shear resistance were discussed based on the modes of failure exhibited, deflection and strain (steel and FRP) responses. Overall the results obtained are in good agreement with many researches which indicated that addition of externally bonded FRP, as a matter of fact, preserves the integrity of internal transverse stirrups. With continuous FRP sheets and U-wrapped scheme, greater FRP contribution to the shear resistance can be expected.

scholarly journals Modelling of the shear resistance of self-stressed beams reinforced with FRP applying the Critical Shear Crack Theory

2021 ◽  
Vol 350 ◽  
pp. 00016
Author(s):  
Viktar Tur ◽  
Aliaksandr Varabei
Keyword(s):  
Shear Crack ◽  
Crack Opening ◽  
Shear Resistance ◽  
Experimental Investigations ◽  
Inclined Crack ◽  
Ultimate State ◽  
Bond Slip ◽  
Crack Theory ◽  
Dowel Action ◽  
Frp Bars

This paper presents a mechanical model of the shear resistance based on Critical Shear Crack Theory (CSCT) and its application for the checking of the shear ultimate state of self-stressed elements reinforced with FRP bars. The shear force, which is transmitted through the inclined crack by aggregate interlock, residual tensile strength, dowel action and inclined chord of the compression concrete, is calculated depending on the value of the inclined crack opening, determined according to the modified law “bond-slip” for FRP bars. The reliability of the proposed approach is confirmed by comparison both with the results of our own experimental investigations and with numerous research results by various authors.

scholarly journals SHEAR RESISTANCE MECHANISMS ON HIGH-PANELIZED STEEL SHEET SHEAR WALLS WITH BURRING HOLES

2018 ◽  
Vol 24 (56) ◽  
pp. 177-182
Author(s):  
Yoshimichi KAWAI ◽  
Kazunori FUJIHASHI ◽  
Shigeaki TOHNAI ◽  
Atsushi SATO ◽  
Tetsuro ONO
Keyword(s):  
Steel Sheet ◽  
Shear Walls ◽  
Shear Resistance ◽  
Resistance Mechanisms

Shear resistance of concrete contribution in RC beams under flexure and shear

2020 ◽  
Vol 21 (8) ◽  
pp. 1453-1461
Author(s):  
Mohammad Farzana ◽  
T. Anjani Prasad ◽  
G. Papa Rao
Keyword(s):  
Shear Resistance ◽  
Rc Beams

Influence of Longitudinal Reinforcement Ratio on Shear Strength of RC Slender Beam Under Different Loading Rates

2020 ◽  
Vol 897 ◽  
pp. 91-97
Author(s):  
Halwan Alfisa Saifullah ◽  
Kenichiro Nakarai ◽  
Nobuhiro Chijiwa ◽  
Koichi Maekawa ◽  
Stefanus Kristiawan
Keyword(s):  
Shear Strength ◽  
Loading Rate ◽  
Concrete Structures ◽  
Shear Resistance ◽  
Reinforcement Ratio ◽  
Sustained Load ◽  
Longitudinal Reinforcement ◽  
Rc Beams ◽  
Shear Cracks ◽  
Loading Rates

. A primary current focus in concrete shear design is how to ensure the shear resistance of the concrete structures to withstand the possible adverse creep effects during the service life. All shear-carrying actions are supposed to depreciate due to the enhanced critical shear cracks under sustained loads. However, only a few studies that evaluated the performance of concrete structures failing in shear due to long-term loading. As the longitudinal tensile reinforcement strain influences the shear strength of RC beam, the shear resistance of the beam under sustained load may also be affected by the amount of longitudinal reinforcement. The present study aims at investigating the influence of flexural reinforcement ratio on the shear creep failures of reinforced concrete (RC) beams without stirrups by non-linear finite element analysis. In this study, the numerical model of RC beams with reinforcement ratios varying from 0.4% to 3.2% was evaluated under different loading rates. A loading rate of 1000 and 10000 times slower than the static loading rate were adopted to reveal the creep effects of RC beams.

scholarly journals Shear resistance analytical evaluation for RC beams with transverse reinforcement with two different inclinations

2020 ◽  
Vol 53 (1) ◽  
Author(s):  
Piero Colajanni ◽  
Salvatore Pagnotta ◽  
Antonino Recupero ◽  
Nino Spinella
Keyword(s):  
Shear Resistance ◽  
Transverse Reinforcement ◽  
Rc Beams ◽  
Analytical Evaluation
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