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首页> 外文期刊>Bulletin of earthquake engineering >Experimental assessment of soil-structure interaction effects on a super long-span cable-stayed-bridge with pile group foundations
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Experimental assessment of soil-structure interaction effects on a super long-span cable-stayed-bridge with pile group foundations

机译：用桩基基础对超长跨度斜拉桥土壤结构相互作用影响的实验评价

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Soil-structure interaction (SSI) plays an important role in overall structural seismic behavior. However, there is a scarcity of experimental studies evaluating the SSI effects on a full bridge including superstructure, pile foundations and site soil. This paper focused on shaking table investigations on the effects of SSI on a super long-span cable-stayed bridge model with pile groups and mixture soil modelled by using uniaxial laminar shear boxes. The cable-stayed bridge model was subjected to a series of earthquake excitations in the longitudinal direction, including white noise and various earthquake waves. The dynamic interactive behavior of the cable-stayed bridge model was explored for various shaking amplitudes and frequency components. Furthermore, the influences of the soil on the system dynamic characteristics were clarified statistically. The test results show that the SSI obviously affects the seismic response of the cable-stayed bridge model in the longitudinal direction, and corresponding accelerations of structural members are amplified. The bridge seismic response may be underestimated and misinterpreted to some extent while the SSI effects are ignored. It is, therefore, suggested that more attentions should be poured into the SSI effects when performing the seismic design of super long-span cable-stayed bridges. Moreover, the SSI effects on the bridge seismic responses decrease with the increase of shaking amplitude, and significantly change as the frequency components of the input motions vary. When evaluating the system damping ratio with the SSI, the system seismic responses may be varied to a certain degree if the soil viscous damping contribution is neglected.
机译：土壤结构相互作用（SSI）在整体结构地震行为中起着重要作用。然而，在包括上层建筑，桩基和位点土壤的全桥上评估SSI效应的实验研究缺乏实验研究。本文侧重于振动表调查，采用单轴层剪箱采用桩基和混合土壤SSI对超长跨度斜拉桥模型的影响。电缆稳定的桥梁模型在纵向方向上进行一系列地震激励，包括白噪声和各种地震波。探索了电缆稳定桥模型的动态交互式行为，用于各种摇动幅度和频率分量。此外，统计上阐明了土壤对系统动态特性的影响。测试结果表明，SSI显然影响了在纵向方向上的电缆缓冲桥模型的地震响应，并且放大了结构构件的相应加速度。桥梁地震响应可能低估并在一定程度上误解，而SSI效应被忽略。因此，建议在进行超级长跨度缆绳座椅的地震设计时应将更多的注意力倒入SSI效应。此外，随着输入运动的频率分量变化而显着变化，SSI对桥接抗震响应的影响降低，并且随着输入运动的频率分量而显着变化。当评估与SSI的系统阻尼比时，如果忽略了土壤粘性阻尼贡献，系统地震反应可能会在一定程度上变化。

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