【摘要】 由于大跨度桥梁的桥墩间距离较大,其地震响应分析应考虑地震动输入的空间效应。本文建立了多点激励下大跨度桥梁地震响应分析方法,采用损伤塑性本构模型模拟混凝土材料特性,考虑地震动空间效应对大跨度连续刚构桥进行非线性地震响应分析,从而分析地震动空间效应对大跨度桥梁地震响应的影响。研究表明:考虑行波激励或多点激励时桥梁地震响应较一致激励而言有所差异,考虑地震动空间效应时可能会夸大或减小桥梁结构的动力响应;多点激励时桥梁地震响应会随视波速的改变而变化。由此得出结论,对于大跨度桥梁地震响应分析应合理的考虑地震动空间效应。更多还原

【Abstract】 Because of long distance between of bridge piers, the ground motion spatial effect of long span bridges should be considered in seismic response analysis. In this paper, we established a long span bridges seismic analysis method, which can consider ground motion spatial effect. In order to analyze ground motion spatial effect influence on seismic response of long span bridges, seismic responses of long span continuous rigid-frame bridge are analyzed, and concrete material is simulated by using plastic constitutive damage model. The results indicate that bridge seismic responses will have difference under traveling waves excitation or multi-support excitation relative to uniform excitation, and bridge seismic responses may be increased or decreased when ground motion spatial effect is considered. Bridge seismic responses will changed with different apparent wave velocity. In conclusion, we believe that the ground motion spatial effect should be considered at certain degree in seismic response analysis of long span bridges.更多还原