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以嘉绍大桥为例,利用地震作用的时程分析方法,深入研究了考虑行波效应的多点激励作用下,大跨度六塔斜拉桥地震响应特性。研究结果表明:考虑行波效应时大跨度六塔斜拉桥和大跨度双塔斜拉桥的地震响应均小于一致激励作用时的情况,其中六塔斜拉桥在靠近边跨的桥塔和主梁相比靠近跨中部分的地震响应对行波效应更为敏感。同时,刚性铰对多塔斜拉桥地震响应不敏感。
Taking Jiaosha Bridge as an example, the seismic response characteristics of long-span six-pylon cable-stayed bridge under multi-point excitation considering traveling wave effect are studied deeply by means of time-history analysis of seismic action. The results show that the seismic responses of long-span six-pylon cable-stayed bridge and long-span double-pylon cable-stayed bridge are all less than those of the uniform excitation when the traveling wave effect is considered. Among them, the six-pylon cable- The seismic responses of girders closer to midspan are more sensitive to traveling wave effects. At the same time, the rigid hinge is not sensitive to the seismic response of the multi-tower cable-stayed bridge.