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研究地震动空间变化效应对实际的大跨度桁架拱结构地震反应的影响,进行了空间变化地震动激励下结构反应的详细数值模拟。考虑了由行波效应、部分相干效应和局部场地效应引起的地震动空间变化。分析了地震动不同行波波速、相干损失和局部场地条件对结构地震反应的影响。在数值计算中,基于经验相干损失函数和《建筑抗震设计规范》定义的反应谱模拟了空间变化地震动。研究结果表明,引起地震动空间变化的每一个因素对桁架拱结构的反应都有重要的影响,在分析中忽略地震动空间变化效应可能低估该类结构的地震反应。为了准确评估结构反应并更好地进行大跨度桁架拱结构的抗震设计,模拟可靠的空间变化地震动十分必要。所获得的结果可为桁架拱结构的实际设计提供参考。
The effect of spatial variation of ground motions on the seismic response of a real long-span truss arch structure is studied. The detailed numerical simulation of the structural response under spatial motions is carried out. The spatial variation of ground motions caused by traveling wave effect, partial coherence effect and local site effect is considered. The effects of different traveling wave velocities, coherent losses and local site conditions on seismic response of structures are analyzed. In numerical calculation, the response spectrum based on the empirical coherence loss function and the seismic code for building design simulates the spatial variation of ground motions. The results show that each of the factors that cause the spatial variation of ground motion has an important influence on the response of truss arch structure. Ignoring the spatial variation effect of ground motion in the analysis may underestimate the seismic response of this kind of structure. In order to accurately evaluate the structural response and to better aseismic design of long-span truss arch structures, it is necessary to simulate the reliable spatial change of ground motions. The obtained results can provide reference for the actual design of truss arch structure.