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为防止钢筋混凝土框架柱发生脆性破坏,实现中、强地震作用下所期待的延性破坏,对10个框架中柱构件进行了反复荷载作用下塑性铰形成后的抗剪性能试验研究。从混凝土及箍筋应力水平等条件出发,提出纵筋屈服后框架柱破坏形态的分类标准;研究纵筋屈服后箍筋与混凝土各自的抗剪贡献,回归得出构件在不同位移延性时箍筋及混凝土抗剪贡献的计算公式;以试验为依据研究了框架柱塑性铰区域混凝土抗剪承载力的退化过程及剪切受力机理,对不同延性需求的构件给出不同的抗剪承载力计算公式,弥补我国现行规范未明确剪切抗力与不同延性需求之间定量关系的缺陷。
In order to prevent the brittle failure of reinforced concrete frame columns and to achieve the desired ductile failure under moderate and strong earthquakes, the shear performance of the frame members subjected to repeated loading under repeated load was experimentally studied. Based on the stress levels of concrete and hoop, the classification criteria of the failure modes of the frame columns after longitudinal reinforcement yielding are proposed. The shear contribution of stirrup and concrete after longitudinal reinforcement yielding is studied. And the formula for calculating the shear contribution of the concrete. Based on the experimental study, the degradation process and shear stress mechanism of the shear strength of the concrete in the frame-hinge region are studied, and the different requirements for the ductility are given. Formula, to make up for our country’s current norms not clear shear resistance and the relationship between the different requirements of the ductility of the shortcomings.