Effect of Various Structural Factors on Shear Strength Degradation after Yielding of RC Members under Cyclic Loads
Effect of Various Structural Factors on Shear Strength Degradation after Yielding of RC Members under Cyclic Loads
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DOI：
10.3151/jact.18.211
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发表时间：
2020-04
影响因子：
2
通讯作者：
L. Fu;Hikaru Nakamura;Yoshihito Yamamoto;T. Miura
中科院分区：
文献类型：
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作者：
L. Fu;Hikaru Nakamura;Yoshihito Yamamoto;T. Miura
受弯屈服后的剪切破坏是钢筋混凝土构件在循环荷载作用下的一种典型破坏模式，它是由初始抗剪强度随着塑性的增加而降低，直至抗剪能力退化至低于抗弯强度的现象引起的。本研究采用三维刚体-弹簧法对具有拉配筋率、抗剪配筋率、抗剪跨深比（覆盖深柱和细长柱）和轴压荷载等较为广泛的关键结构因素的若干RC柱进行了弯剪性能模拟，并对所有试件的抗剪强度退化行为进行了定量评价，以了解结构因素的影响。此外，将抗剪强度退化行为解耦为抗剪构件（梁作用、拱作用、桁架作用、混凝土对梁作用）的退化行为，明确了各关键结构因素下钢筋混凝土柱受弯后受剪破坏的机理。从而了解了关键结构因素对抗剪强度和抗剪强度退化行为的影响，认为拱作用的逐步退化是所研究的结构因素对钢筋混凝土柱受弯后抗剪破坏的主导机制。本文是作者先前出版物[Nakamura， H., Furuhashi， H., Yamamoto， Y. and Miura， T.,(2015)]的英文扩展版。循环荷载作用下钢筋混凝土构件抗剪强度退化的评价JSCE学报，71(1),48-57。(在日本)]。
Shear failure after flexural yielding is a typical failure mode for a reinforced concrete (RC) member subject to cyclic load, and it is caused by the phenomenon that the initial shear strength is decreased with the increasing plastic ductility until the shear capacity degrades to be lower than the flexural strength. In this study, the flexure-shear behaviors of a number of RC columns with a relatively wide range of crucial structural factors involving tensile reinforcement ratio, shear reinforcement ratio, shear span-depth ratio (covering deep and slender columns) and axial compression load were simulated by the Three Dimensional Rigid-Body-Spring-Method, and the degradation behaviors of shear strength of all specimens were quantitatively evaluated to comprehend the effect of the structural factors. Moreover, the degradation behaviors of shear strength were decoupled into the degradation behaviors of shear resistance components (beam action, arch action, truss action, concrete contribution for beam action) to clarify the mechanism of shear failure after flexural yielding for the RC columns at various crucial structural factors. Consequently, the effect of crucial structural factors on the degradation behaviors of shear strength and shear resistance components were understood and it was concluded that the stepwise degradation of arch action was the dominant mechanism for the investigated structural factors for the shear failure after flexural yielding of RC column. This paper is an extended version in English from the authors’ previous publication [Nakamura, H., Furuhashi, H., Yamamoto, Y. and Miura, T., (2015). “Evaluation of shear strength degradation of RC member subjected to cyclic loading.” Journal of JSCE E2, 71(1), 48-57. (in Japanese)].