STUDY ON EQUIVALENT PLASTIC HINGE LENGTH OF SRC FRAME COLUMNS
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摘要: 为了对地震作用下型钢混凝土框架柱的等效塑性铰长度做出较为准确的定义，根据课题组前期试验结果，对水平地震作用下型钢混凝土框架柱的破坏现象和机理进行了深入分析，建立了地震作用下型钢混凝土柱的柱顶极限位移模型，基于考虑纵筋屈服后型钢和核心区混凝土的弯曲效应以及型钢翼缘的应变渗透效应，通过理论分析与推导得到了柱顶极限位移模型中各分量对应塑性转角计算方法，最终采用曲率积分的原理建立了适用于型钢混凝土框架柱等效塑性铰长度的计算表达式。将解析方法得到计算结果与试验结果进行对比，结果表明：该文所提出的等效塑性铰长度计算公式与型钢混凝土框架柱在水平地震荷载作用下的试验结果吻合较好，该研究结果可为型钢混凝土组合结构构件基于性能的抗震设计和弹塑性分析提供一定的理论支撑。Abstract: In order to define the equivalent plastic hinge length of steel reinforced concrete (SRC) frame columns under earthquake, according to the test results of SRC frame columns under low cyclic loading, the top ultimate displacement model of SRC frame columns was obtained through analyzing the failure phenomena and mechanism of SRC columns under earthquake. The plastic rotation angles of each component were established by considering the bending effect in the core area and the strain permeability effect of steel flange. Finally, the formula for calculating the equivalent plastic hinge length of SRC frame columns was obtained by adopting the principle of curvature integral. Meanwhile, the calculated results of the analytical method were compared with experimental results. The results obtained by the calculation formula for the equivalent plastic hinge length proposed agree well with the test results. The research results can provide some theory support for performance-based seismic design and elastic-plastic analysis of SRC structure components.
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