连接Maxwell模型的两相邻结构地震易损性分析

Seismic fragility analysis of two adjacent structures connected with Maxwell dampers

对连接Maxwell模型的两相邻钢筋混凝土框架结构建立二维模型,考虑了梁柱单元及阻尼器单元在大震作用下的非线性行为,通过大量的增量动力分析(IDA),研究了Maxwell阻尼器优化参数理论表达式在结构经历初始弹性、屈服直至倒塌全过程的适用性,并基于IDA分析的结果,对结构未控和控制情况下的地震易损性曲线进行了比较分析,从性能评估的角度研究了Maxwell阻尼器对相邻结构在不同地震波及不同地震动强度水平下的控制效果。通过相邻结构在不同地震动强度水平下的顶层位移时程发现,Maxwell阻尼器在小震作用下对两结构顶层位移控制效果均较好,但是在大震作用下,仅对结构2有明显的控制效果;由控制和未控时的相邻结构的地震易损性曲线亦可看出,Maxwell阻尼器对结构2在各性能水平下的控制效果均优于结构1。最后,通过大量的参数化分析,基于相邻结构地震易损性最小原则提出了合适的阻尼器参数值。

A two-dimensional model of two adjacent reinforced concrete frames connected with Maxwell dampers was set up considering the nonlinear behavior of beam-column elements and damper ones under major earthquakes. Through a lot of incremental dynamic analysis （IDA）,the applicability of Maxwell damper optimal parameters theoretical expressions in the whole process from initial elastic,yield to final collapse of the structures was investigated.Based on the results of IDA,the comparative analysis of seismic fragility curves of the structures with control and without control was done.From the perspective of performance evaluation,the control effects of Maxwell dampers on the two adjacent structures were studied under different seismic waves and different seismic intensities.Through time history analysis of top floor displacements of the adjacent structures under different seismic intensities,it was shown that the control effects of Maxwell dampers on the top floor displacements of the two adjacent structures are good under small earthquakes;however, under big earthquakes,only the second structure can be controlled significantly;the control effects of Maxwell dampers on the second structure under each performance level are superior to those on the first structure.Finally,through a large number of parametric analyses and based on the principle of the minimum seismic fragility of adjacent structures,the suitable parameter values of Maxwell dampers were proposed.