高层隔震结构受拉损伤破坏界限设计理论及易损性分析

Design theory and vulnerability analyses of bearing tension,damage and failure limit for high-rise isolated structures

针对高层隔震结构在强震下存在的结构整体摇摆和隔震支座受拉问题,基于扭转耦联及振型质量等效原理建立了简化的高层隔震结构平动-摇摆双质点模型。利用反应谱法得到了支座受拉、损伤和破坏界限地震影响系数公式,并分析了结构高宽比、支座设计面压以及支座布置列数对理论界限最大地震影响系数的影响。振动台模型试验和数值模拟表明界限地震影响系数理论解与振动台试验及数值模拟结果一致。最后对高宽比为3,4和5的框架-剪力墙隔震结构进行了支座受拉、损伤和破坏界限易损性分析,结果表明不同高宽比下支座界限理论推导值较为准确,与数值模拟结果的误差较小,研究成果可为高层隔震结构设计提供参考。

Here,aiming at problems of high-rise isolated structures having overall swing and their isolation bearings being stretched under strong earthquakes,based on translation-torsion coupling and the modal shape mass equivalence principle,a simplified translation-swing two-mass point model of high-rise isolated structure was established.Using the response spectrum method,formulas for seismic influence coefficients of bearing tension,damage and failure limit were obtained,and effects of structural height-width ratio,bearing design surface pressure and bearing arrangement column number on the theoretical limit maximum seismic influence coefficient were analyzed.Shaking table model tests and numerical simulation showed that theoretical solutions of limit seismic influence coefficients are consistent with the results of shaking table tests and numerical simulation.Finally,vulnerability analyses for bearing tension,damage and failure limit of frame-shear wall isolated structures with height-width ratios of 3,4 and 5 were performed,respectively.The results showed that bearing limit theoretical derivation values under different height-width ratios are more accurate,and errors between theoretical derivation values and numerical simulation results are smaller;the study results can provide a reference for designing high-rise isolated structures.