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Analysis of the Effect of Soil-Structure Interaction on the Response of Railway Bridges using Boundary Element - Finite Element Methods

机译：土 - 结构相互作用对铁路桥梁响应的影响分析 - 边界元 - 有限元法

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The dynamic behaviour of short simply-supported railway bridges under convoy circulationsand, especially, the effect of soil structure interaction (SSI) in the maximumexpectable deck transverse response is the aim of this study. These structures due totheir usually light weight may experience excessively high acceleration levels underresonant conditions. In order to approach this wave propagation problem, a coupledthree-dimensional Boundary Element-Finite Element model formulated in the timedomain is used to reproduce the soil and structural behaviour, respectively. As theresonant phenomenon in this application is highly influenced by the free vibration responseof the deck, a sensitivity analysis is designed in order to first analyse how SSIaffects the free vibration response of beams under the circulation of a single movingload in a wide range of velocities. A subset of beam bridges is defined consideringspan lengths ranging from 12.5 to 25 m, and fundamental frequencies covering associatedtypologies. A single soil layer is considered with shear wave velocities rangingfrom 150 to 365 m/s. From the single load free vibration parametric analysis conclusionsare derived regarding the conditions of maximum free vibration and cancellationof the response. These conclusions are used afterwards to justify how resonant amplitudesof the bridge under the circulation of railway convoys are affected by the soilproperties, leading to substantially amplified responses or to almost cancelled ones,and numerical examples are included to show the aforementioned situations
机译：本研究旨在研究短时简支铁路桥梁在车队环流下的动力学行为，特别是土壤结构相互作用（SSI）在最大可预期甲板横向响应中的作用。这些结构由于其通常较轻的重量，在共振条件下可能会经历过高的加速度水平。为了解决该波传播问题，在时域中建立的三维三维边界元-有限元耦合模型分别用于再现土壤和结构特性。由于在此应用中的共振现象受甲板的自由振动响应的影响很大，因此设计了灵敏度分析，以便首先分析SSI如何在宽范围内的单个移动载荷的循环下影响梁的自由振动响应。定义梁桥的一个子集时要考虑到12.5到25 m的跨度长度，以及涵盖相关类型的基本频率。单个土层被认为具有150至365 m / s的剪切波速度。从单自由振动的参数分析得出关于最大自由振动和响应抵消的条件的结论。这些结论随后被用来证明在铁路车队循环下桥梁的共振振幅如何受到土壤性质的影响，从而导致响应被大幅放大或几乎被抵消，并通过数值例子说明了上述情况。

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