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首页> 外文期刊>Engineering Structures >Significance of SSI and nonuniform near-fault ground motions in bridge response Ⅰ : Effect on response with conventional expansion joint
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Significance of SSI and nonuniform near-fault ground motions in bridge response Ⅰ : Effect on response with conventional expansion joint

机译：SSI和近场非均匀地震动在桥梁响应中的意义Ⅰ：对常规伸缩缝响应的影响

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摘要

This paper studies the influence of spatially varying near-source ground motions and soil-structure interaction (SSI) on the relative response of two bridge frames. The spatial ground motions are simulated according to a near-fault ground motion model with different wave apparent velocity and a coherency loss function. Numerical calculations of bridge structure responses including pounding and SSI effect to a number of simulated spatially varying ground motions are carried out. The study reveals that the assumption of uniform ground excitation and fixed base in the analysis and design might not provide a realistic estimation of the pounding responses of bridge frames. The consequence of adjusting bridge fundamental frequency ratio towards unity to minimize relative response and consequently girder pounding potential as recommended by current design regulations is also evaluated.
机译：本文研究了空间变化的近源地震动和土-结构相互作用（SSI）对两个桥梁框架相对响应的影响。根据具有不同波表观速度和相干损失函数的近断层地面运动模型对空间地面运动进行了仿真。进行了桥梁结构响应的数值计算，包括对多个模拟的空间变化地面运动的冲击和SSI效应。研究表明，在分析和设计中假设采用统一的地面激励和固定基础可能无法对桥梁框架的撞击响应提供实际的估计。还评估了按照当前设计法规的建议将电桥基频比调整为一个单位以最大程度地减小相对响应的结果，并因此评估了梁的冲击力。

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