斜拉桥多点地震激励响应分析

Response Analysis of the Cable-stayed Bridge Based on Multi-support Earthquake Excitation

对一座全飘浮的斜拉桥分别施以多点激励与一致激励,研究了多点地震激励对斜拉桥动力响应的影响程度.输入多点激励后,在斜拉桥上选取某些控制节点的位移值或内力值与一致激励相比,存在很大差异,而且是多点激励下桥梁结构的位移与内力响应更为不利.推荐在斜拉桥的设计阶段,在一致激励的基础上进行多点激励响应分析,设计值由两者分析结果的不利组合取定,或者由包络值控制;对已建的基于一致激励设计的斜拉桥地震受损原因的查找,可以综合多点激励进行震害分析.

Imposinga full floating cable-stayed bridge with multi-support and consistent excitation respectively, the authorsstudied the influence of multi-support earthquake excitation on the cable -stayed bridge. The results showed that some ofselected nodal displacement or internal force under multi-support excitation, comparing with under consistent excitation, hadgreat difference. As multi -support excitation might be more unfavorable, the paper should pay more attention on it. Theauthors should carry out the analysis of multi-support excitation response on the basis of consistent excitation in design, andthe design value is determined by the combination of the two analysis results or controlled by the envelope value; the seismicdamage analysis of the cable-stayed bridge based on consistent excitation also be recommended to analyze comprehensivelycombined with multi-support excitation.