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基于平稳随机地震动场理论 ,研究了地震动空间变化 ,包括行波效应、相干损失和局部场地条件 ,对大跨度斜拉桥地震响应特征的影响。采用虚拟激励方法计算结构的随机响应。计算的响应量包括塔顶位移、塔底弯矩、辅助墩底弯矩等 ,得到的主要结论是 :与一致地震激励相比 ,地震动空间变化可以使斜拉桥的地震反应改变达 4 0 % ,仅考虑行波效应可以得到响应的偏于保守的估计值 ;局部土场地条件对斜拉桥的地震反应有重要影响 ,当各塔、墩处的土质条件差异较大时需进行详细的抗震分析。
Based on the theory of stationary random ground motions, the effects of spatial variations of ground motions, including traveling wave effects, coherent losses and local site conditions, on the seismic response characteristics of long-span cable-stayed bridges are studied. The Virtual Incentive Method is Used to Calculate the Random Response of Structures. The calculated response includes the top displacement, the bottom bending moment and the auxiliary bottom bending moment. The main conclusions are: Compared with the consistent earthquake excitation, the spatial variation of ground motion can change the seismic response of the cable-stayed bridge to 40% %, The conservative estimate is obtained only considering the traveling wave effect. The local soil conditions have an important influence on the seismic response of the cable-stayed bridge. When the soil conditions at the towers and piers differ greatly, the detailed Seismic analysis.