【摘要】 为获得大跨度刚构桥在多维多点地震激励下的响应特征,基于功率谱模型合成了满足给定相关函数的多维多点人工地震波。采用有限元软件SAP2000分别在线性与非线性领域对某大跨度刚构桥进行计算分析,研究刚构桥在多维多点地震下的响应特点。结果表明,多点激励下刚构桥主梁的横向弯矩往往较一致激励下的大;考虑非线性特性后,刚构桥在三向地震作用下的响应并不等于单向地震响应的简单叠加,且刚构桥的墩顶比墩底部位更易形成塑性铰,建议在实际工程中重视刚构桥墩顶部位的延性设计。更多还原

【Abstract】 In order to obtain response characteristics of rigid frame bridge in the case of multi-dimensional and multi-support excitations,based on power spectral model,multi-dimensional and multi-point artificial seismic waves meeting the given correlation function were generated.Then,a large-span rigid frame bridge was analyzed with finite element software SAP2000 both in the linear and nonlinear area,and response characteristics of rigid frame bridge under the multi-dimensional and multi-support earthquake were studied.Results show that the transverse moments of the main girders of rigid frame bridge in the case of multi-support excitations are usually larger than those in the case of uniform excitation;After taking nonlinear properties into account,responses of rigid frame bridge under three-dimensional earthquake do not equal the simply superimposed results under one-dimension,and plastic hinges are more likely to form on the top of piers than at the bottom of piers,so ductile design on the top of piers of rigid frame bridges should be paid attention in practical engineering.更多还原