摘要
准确计算钢筋混凝土(RC)圆柱的受剪承载力是进行延性抗震设计的关键,可有效防止脆性剪切和弯剪破坏模式发生。基于已有的RC圆柱拟静力试验结果,分析了RC圆柱的地震破坏模式和受剪承载力确定方法,在理论分析的基础上提出了考虑变形(位移延性)影响的RC圆柱受剪承载力计算模型,并与现有模型进行了比较。研究结果表明,地震作用下RC圆柱的受剪承载力随塑性铰区变形的增加而减小;弯剪破坏模式下,RC圆柱的受剪承载力取决于塑性铰区剪切破坏发生时对应的水平荷载而非骨架曲线上的峰值荷载;所提出的模型能有效反映变形对RC圆柱受剪承载力的影响,计算结果与试验数据吻合较好,可用于不同地震破坏模式RC圆柱受剪承载力计算。
Accurate calculation of shear strength of reinforced concrete （RC） circular columns plays a key role in the ductile seismic design, which can effectively prevent the occurrence of brittle shear and flexure- shear failure. Based on the existing quasi-static test results of RC circular columns, the seismic failure modes and the method for determining the shear strength capacity of RC circular columns are analyzed. On the basis of theoretical analysis, a shear strength model of RC circular column considering the effects of inelastic deformation （displacement ductility） is proposed and compared with the existing model. The results show that the shear strength capacity of RC circular columns decreases with the increase of deformation in the plastic hinge region under seismic loading. The shear strength capacity of flexural-shear failure columns depends on the lateral load corresponding to the shear failure point of the plastic hinge region rather than peak lateral load of the skeleton curve. The proposed model is able to effectively reflect the effects of deformation on the shear strength capacity of RC circular columns. And the results are in good agreement with the experimental data and can be used to predict the shear strength capacity of RC circular columns with different failure modes under seismic excitations.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第11期72-82,共11页
Journal of Chongqing University
基金
国家自然科学基金资助项目(51678104
51508154)
江苏省自然科学基金资助项目(BK20150803)
中国博士后科学基金面上项目(2015M581711)
国家重点实验室开放基金项目(LP1515)~~
关键词
钢筋混凝土圆柱
弯剪破坏
受剪承载力
位移延性
reinforced concrete circular column
flexure-shear failure
shear capacity
displacement ductility
