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以某跨海工程2×1 500m三塔斜拉桥设计方案为背景,采用非线性时程分析方法,考虑多点激励地震输入,研究了多点激励行波效应对超大跨径多塔斜拉桥的地震响应影响,比较了不同地震视波速和地震动频谱特性对桥梁结构地震响应的影响规律。结果表明,对于超大跨径的多塔斜拉桥,多点激励行波效应对其地震响应有显著影响,行波效应对超大跨径多塔斜拉桥地震响应的影响受地震动频谱特性的影响较大,对于超大跨径多塔斜拉桥的抗震设计仅考虑一致激励输入是不合理的。
Taking the design of 2 × 1 500m three-pylon cable-stayed bridge as a cross-sea project as the background, nonlinear time-history analysis method and multi-point excitation seismic input are considered. The effect of multi-point excitation traveling wave on long- Bridge seismic response, the impact of different seismic velocity and frequency spectrum characteristics of seismic response of the bridge structure was compared. The results show that for multi-tower cable-stayed bridges with super-long span, the multi-point excitation traveling wave effect has a significant effect on the seismic response. The effect of traveling wave on the seismic response of the super long span multi-tower cable-stayed bridge is affected by the spectrum characteristics of ground motion It is unreasonable to consider only the consistent excitation input for the aseismic design of the large span multi-tower cable-stayed bridge.