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首页> 外文期刊>Bulletin of earthquake engineering >Implications of non-synchronous excitation induced by nonlinear site amplification and of soil-structure interaction on the seismic response of multi-span bridges founded on piles
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Implications of non-synchronous excitation induced by nonlinear site amplification and of soil-structure interaction on the seismic response of multi-span bridges founded on piles

机译：非线性部位扩增诱导的非同步激励和土壤 - 结构相互作用对桩上桩基桥梁地震响应的影响

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This work investigates the effects of soil-structure interaction and spatial variability of seismic motion due to nonlinear site amplification on the seismic behaviour of long multi-span bridges founded on piles. An analysis framework able to include the spatial variation of ground motion induced by specific geological and geomorphological scenarios in the seismic soil-structure interaction analysis of long bridges is adopted, exploiting advantages of the substructure approach. The methodology is applied to a case study constituted by a pile-supported multi-span bridge founded in a soft clay deposit overlaying a stiff bedrock with three different configurations: horizontal, inclined and wedge-shaped. The reference input motion at the outcropping bedrock is represented by a set of real accelerograms and different seismic response models are used to compute site amplification effects, discussing the contribution to the free-field ground motion of both the two-dimensional configuration of the deposit and the nonlinear soil behaviour. The ground motions obtained from the different models are then used for computing the foundation input motion accounting for the pile-soil kinematic interaction; thereafter, inertial interaction analyses are performed on structural models with either fixed or compliant base, considering the non-synchronous seismic actions at the piers foundation. The results, compared in terms of piers head displacements, ductility demand and deck transverse bending moments, finally show the relative importance of bedrock morphology, soil nonlinearity and soil-structure interaction on the structural response.
机译：本文研究了地基-结构相互作用和非线性场地放大引起的地震运动空间变异对桩上多跨桥梁抗震性能的影响。利用子结构方法的优势，采用了一个分析框架，该框架能够在长桥地震-土-结构相互作用分析中包含特定地质和地貌场景引起的地震动的空间变化。该方法被应用于一个案例研究，该案例研究由一座桩支承的多跨桥梁构成，该桥梁建立在一个软粘土沉积层上，覆盖着三种不同结构的坚硬基岩：水平、倾斜和楔形。露头基岩处的参考输入运动由一组真实加速度图表示，不同的地震响应模型用于计算场地放大效应，讨论了沉积物二维结构和非线性土壤行为对自由场地面运动的贡献。然后从不同的模型得到的地面运动用于计算桩-土动力相互作用的基础输入运动；此后，考虑在桥墩基础上的非同步地震作用，在固定或柔顺的基础上对结构模型进行惯性相互作用分析。结果表明，基岩形态、土壤非线性和土壤-结构相互作用对结构响应的相对重要性。

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