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Title |
Strut-and-Tie Model for Shear Strength of Reinforced Concrete Squat Shear Walls
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Authors |
문주현(Ju-Hyun Mun) ; 양근혁(Keun-Hyeok Yang) |
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DOI |
http://dx.doi.org/10.4334/JKCI.2015.27.6.615 |
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Keywords |
저층형 전단벽 ; 전단강도 ; 스트럿-타이 모델 ; 트러스 작용 ; 전단철근 ; 균열 띠 이론 squat shear wall ; shear strength ; strut-and-tie model ; truss action ; shear reinforcement ; crack band theory |
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Abstract |
The previous strut-and-tie models (STMs) to evaluate the shear strength of squat shear walls with aspect ratio less than 2.0 do not consider the axial load transfer of concrete strut and individual shear transfer contribution of horizontal and vertical shear reinforcing bars in the web. To overcome the limitation of the existing models, a simple STM was established based on the crack band theory of concrete fracture mechanics. The equivalent effective width of concrete strut having a stress relief strip was determined from the neutral axis depth and effective factor of concrete strength. The shear transfer mechanism of shear reinforcement at the extended crack band zone was calculated from an internally statically indeterminate truss system. The shear transfer capacity of concrete strut and shear reinforcement was then driven using the energy equilibrium in the stress relief strip and crack band zone. The shear strength predictions of squat shear walls evaluated from the current models are in better agreement with 150 test results than those determined from STMs proposed by Siao and Hwang et al. Furthermore, the proposed STM gives consistent agreement with the observed trend of the shear strength of shear walls against different parameters.
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