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首页> 外文期刊>Journal of bridge engineering >Impact of Spatial Variability Parameters on Seismic Fragilities of a Cable-Stayed Bridge Subjected to Differential Support Motions
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Impact of Spatial Variability Parameters on Seismic Fragilities of a Cable-Stayed Bridge Subjected to Differential Support Motions

机译：空间变异性参数对斜拉桥在微弱支撑作用下的地震脆性的影响

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摘要

Earthquake ground motions may vary significantly at multiple supports of long-span bridges, such as cable-stayed bridges, due to the incoherence, wave-passage, and site-response effects. To investigate the seismic vulnerability of these bridges, fragility analysis is performed using spatially variable ground motions. To achieve this aim, this study chooses a cable-stayed bridge with the most common configuration in China and creates a numerical model of the bridge, which can account for the inelastic response of its multiple components. Using the conditional simulation method, a set of unknown ground motions are simulated on the basis of a set of prescribed ground motions and characteristics of the target random field. The simulated acceleration time histories are then converted into the associated displacement time-histories to perform multisupport excitation analysis. Using the displacement time histories, a set of nonlinear time-history analyses are performed to generate demand models. The demand models are convolved with limit-state models to develop fragility curves. Moreover, the influence of spatial variability parameters associated with the incoherence, wave-passage, and site-response effects on the vulnerability of multiple components is examined in terms of damage-exceedance probability. The results indicate that the incoherency and site-response effects significantly affect the demands and corresponding component fragilities. The worst case corresponds to the combination of a firm-soft soil site and the largest incoherency drop parameter. The section ductility demands at the base of the pylon are significantly affected by the spatial variability of ground motions. However, it does not appear to produce obvious changes in the cable, the abutment, or the bearing displacement. (C) 2017 American Society of Civil Engineers.
机译：在大跨度桥梁（例如斜拉桥）的多个支撑处，由于不连贯性，波通过和站点响应效应，地震地震动可能会发生显着变化。为了调查这些桥梁的地震易损性，使用空间变化的地面运动进行了脆性分析。为了实现这一目标，本研究选择了中国最常见的斜拉桥，并建立了一个数值模型，该模型可以解释其多个组成部分的非弹性响应。使用条件模拟方法，根据一组规定的地面运动和目标随机场的特征，模拟一组未知的地面运动。然后将模拟的加速时间历史记录转换为关联的位移时间历史记录，以执行多支撑激励分析。使用位移时间历史记录，执行一组非线性时间历史记录分析以生成需求模型。需求模型与极限状态模型进行卷积，以开发脆弱性曲线。此外，从破坏超标概率的角度，研究了与不连贯性，波通过和位点响应效应相关的空间变异性参数对多个组件的脆弱性的影响。结果表明，不连贯性和站点响应效应显着影响需求和相应的组件脆弱性。最坏的情况对应于坚实的土壤场地和最大的不连贯性下降参数的组合。塔架底部的截面延性要求受地面运动的空间变异性的显着影响。但是，它似乎不会在电缆，支座或轴承位移上产生明显的变化。 （C）2017年美国土木工程师学会。

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