【摘要】 利用虚拟激励法和等效线性化技术,计算了基础隔震高层建筑的非平稳随机响应。研究了高阶振型对高层隔震建筑响应的影响,提出了针对基础隔震结构随机响应分析的改进算法。计算中假定隔震建筑上部结构在大震作用下依然保持弹性状态,塑性变形集中在隔震层处,隔震层的恢复力-位移本构关系采用Bouc-Wen模型来描述。上部结构只需要提取前若干阶振型参与动力计算,剩余的高阶振型对结构响应的贡献按照静力校正技术求得。研究表明,改进的计算方法在没有显著增加计算量的同时,通过近似考虑高阶振型的影响,有效地提高了计算的精度。更多还原

【Abstract】 The seismic response analysis of base-isolated high-rise buildings subjected to non-stationary excitation was performed with the pseudo excitation method and the equivalent linearization technique.The influence of higher order vibrational modes of a base-isolated high-rise building on its responses was investigated,and an improved method for stochastic seismic response analysis of such a building was presented.The upper structure of the isolated system was assumed to remain elastic under major earthquakes,and the plastic deformation was assumed to concentrate in the isolation layer.The constitutive relationship between restoring force and displacement of isolation layers was described with Bouc-Wen model.The lower order vibrational modes of the upper structure were taken into account in the dynamic response analysis,while the contribution of the remaining higher order modes to the structural responses was approximated by using the static correction procedure.It was shown that the new method improves the computing accuracy of the responses by taking the contribution of higher order modes into account,while only increases the computational effort slightly.更多还原