Quantification of the effects of the spatial variation of ground motions on the seismic response of highway bridges

IF 0.7 Q4 CONSTRUCTION & BUILDING TECHNOLOGY
Nassira Belkheiri, B. Tiliouine
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引用次数: 0

Abstract

The stochastic responses of highway bridges to spatial variation of ground motions (SVGM) are analysed in this paper. A model of spatially varying ground motions is used to investigate the relative importance of the incoherency effect, the wave passage effect and the site effects on the stochastic dynamic response of an asymmetrical R.C box girder highway bridge with variable inertia. In this study, the incoherency effect is investigated using two widely used models while the wave-passage effect is incorporated using various wave velocities. Then, the random vibration theory is applied to study the effect of the non-uniform seismic excitations on the bridge structure. The bridge response is evaluated in terms of the mean values of the maximum displacements and the bending moments. Analyses of both stationary and transient response are performed. The results show that the stochastic dynamic responses related to site effects are mostly much greater than those calculated using uniform, delayed and incoherent seismic excitation assumptions. As a result, analytical models used for the stochastic dynamic analysis of long span highway bridges should take into account all the SVGM components, particularly the site-response effects.
地震动空间变化对公路桥梁地震反应影响的量化
本文分析了公路桥梁对地震动空间变化的随机响应。采用空间变化地震动模型,研究了非相干效应、通道效应和场地效应对变惯性非对称钢筋混凝土箱梁公路桥梁随机动力响应的相对重要性。在本研究中,使用两种广泛使用的模型来研究非相干效应,同时使用不同的波速来考虑波通过效应。然后,应用随机振动理论研究了非均匀地震激励对桥梁结构的影响。桥梁响应是根据最大位移和弯矩的平均值来评估的。进行了平稳响应和瞬态响应分析。结果表明,与场地效应相关的随机动力响应大多远大于采用均匀、延迟和非相干地震激励假设计算的随机动力响应。因此,用于大跨度公路桥随机动力分析的分析模型应考虑所有SVGM分量,特别是场地响应效应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Bridge Structures
Bridge Structures CONSTRUCTION & BUILDING TECHNOLOGY-
CiteScore
1.10
自引率
0.00%
发文量
5
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