基于Pushover方法的耗能自复位铰节点框架结构抗震性能分析

Seismic performance analysis on energy dissipating self-centering hinge joint frame based on Pushover method

基于Pushover分析方法研究设置耗能自复位铰节点(EDSC-HJ)的钢筋混凝土框架结构的抗震性能.首先介绍EDSC-HJ框架的结构形式,并建立了EDSC-HJ框架结构的有限元模型,通过与振动台试验结果对比验证数值模拟的正确性;其次使用Pushover方法计算EDSC-HJ框架有控结构与无控结构的抗震性能并设计节点弹性恢复装置和耗能装置的力学参数.结果表明:EDSC-HJ框架结构节点相对转动刚度比的合理取值区间为0.05~0.5;设置节点阻尼器的EDSC-HJ有控结构的层间位移响应下降了76%,且满足限值要求;由于节点阻尼器的设置提高了结构的附加抗侧刚度,有控结构的基底剪力响应提高了23%.EDSC-HJ框架结构的抗震性能明显优于钢筋混凝土框架(RCF)结构,具有良好的韧性结构特征.

The static Pushover analysis method is adopted to study the seismic performance of reinforced concrete frames with energy dissipating self-centering hinge joint(EDSC-HJ).Firstly,the structure of EDSC-HJ frame is introduced,and the finite element model of EDSC-HJ frame structure is established,and the correctness of the numerical simulation is verified by comparing with the shaking table test results.Secondly,the Pushover method is employed to assess the seismic performance of EDSC-HJ frame both with and without dampers and determine the mechanical parameters of the joint elastic force-restoring device and the energy-dissipating device.The results indicate that the reasonable range of relative rotational stiffness ratio of beam-column nodes of the EDSC-HJ frame is 0.05-0.5;the interlayer displacement responses of the EDSC-HJ frame with dampers decrease by 76%and meet the limit requirements;the base shear responses of the EDSC-HJ frame with dampers increase by 23%due to the additional lateral stiffness of the structure increased by the setting of dampers.The seismic performance of EDSC-HJ frame is obviously better than that of reinforced concrete frame(RCF)structure,and it has good toughness structure characteristics.