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受控摇摆式钢筋混凝土框架抗震机理研究

DOI: 10.13197/j.eeev.2015.01.66.lul.009, PP. 66-76

Keywords: 受控摇摆,摇摆节点,节点弱化,抗震性能,时程分析

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Abstract:

受控摇摆式钢筋混凝土框架结构(controllablerockingreinforcedconcreteframe,简称CR-RCF)是一种新型减震耗能结构。通过对摇摆节点及整体框架进行的低周反复加载试验,研究其滞回特性。根据整体摇摆框架的滞回曲线得到了受控摇摆式钢筋混凝土框架的等效黏滞阻尼比。通过摇摆节点试验及理论分析,提出了摇摆节点的恢复力模型。利用有限元软件ABAQUS对受控摇摆式钢筋混凝土框架结构进行数值模拟,得到了不同节点刚度水平下结构的地震动力响应,并分析得出摇摆节点刚度的合理弱化程度。通过受控摇摆式钢筋混凝土框架和常规钢筋混凝土框架(RCF)的动力响应对比,可以发现CR-RCF结构可以有效降低结构的层间剪力与加速度响应。与RCF结构相比,CR-RCF结构的剪力与位移响应沿楼层分布较为均匀,这有利于防止层间变形过于集中,使各层材料都能得到充分利用。在受控摇摆式钢筋混凝土框架结构中设置耗能阻尼器,进行时程分析可以发现结构的位移响应可以得到有效的控制。

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