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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。
In order to obtain the response characteristics of long-span rigid frame bridge under multi-dimensional multi-point seismic excitation, a multi-dimensional multi-point artificial seismic wave satisfying a given correlation function is synthesized based on the power spectrum model. The finite element software SAP2000 is used to calculate and analyze a long-span rigid frame bridge in the fields of linearity and non-linearity respectively, and the response characteristics of rigid frame bridge under multi-dimensional and multi-point earthquakes are studied. The results show that the transverse bending moment of the main girder of rigid frame bridge under multi-point excitation is always larger than that under uniform excitation. The response of the rigid-frame bridge under the three-direction earthquake is not equal to that of the unidirectional earthquake considering the nonlinearity Superimposed, and rigid-framed bridge piers pier more likely than the bottom of the formation of plastic hinge, it is proposed in practical projects to attach importance to rigid frame pier top of the ductile design.