4.7 Article

The effect of foundation-soil-foundation interaction on the response of continuous, multi-span railway bridges

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ENGINEERING STRUCTURES
卷 299, 期 -, 页码 -

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ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2023.117096

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Multi-span railway bridges; Piled foundations; Dynamic soil-structure interaction; Foundation-soil-foundation interaction; Periodic structure theory; Moving loads

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This paper investigates the impact of dynamic soil-structure interaction (SSI), including foundation-soil- foundation interaction (FSFI), on the dynamic response of multi-span railway bridges. The findings show that considering SSI can reduce the peak bridge deck acceleration and resonant train speed.
This paper focuses on the effect of dynamic soil-structure interaction (SSI), including foundation-soil- foundation interaction (FSFI), on the dynamic response of multi-span railway bridges, which constitute an important part of high-speed rail networks around the world. We consider an infinitely long box girder bridge on piled foundations and use periodic structure theory to restrict the computational domain to a reference cell. The superstructure is modeled with finite elements, while a periodic finite element-boundary element (FE-BE) model is used to compute the dynamic stiffness of the piled foundation, taking into account FSFI. It is demonstrated that (1) the natural frequencies of the in-phase torsional and bending modes are significantly lowered due to the flexibility of the foundation-soil system; (2) the effect of FSFI on the bridge response is limited for typical span lengths and soil stiffness; and (3) the peak bridge deck acceleration is lower if SSI is taken into account, as is the resonant train speed.

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