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Identification of soil-structure interaction effect in a portal frame railway bridge through full-scale dynamic testing

机译：通过全面动力试验识别门框式铁路桥梁土-结构相互作用效应

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摘要

This paper is devoted to identify the effect of soil-structure interaction on the dynamic response of,a portal frame railway bridge. The study aims to validate the accuracy of numerical models in evaluating the dynamic stiffness and modal properties of the bridge-soil system. To achieve this aim, a controlled vibration test has been performed on a full-scale portal frame bridge to determine the modal properties of the system through measuring Frequency Response Functions. The results of the dynamic test provide reference data for FE model calibration as well as valuable information about the dynamic behavior of this type of bridges. Using the experimental data, an FRF-based model updating procedure was used to calibrate a full 3D solid model involving the entire bridge track-soil system. Both measured and computed responses identify the substantial contribution of the surrounding soil on the global damping of the system and highlight the importance of the soil-structure interaction on the dynamic response of this type of bridges. The identified modal damping ratio corresponding to the fundamental bending mode of the studied bridge was nearly 5 times higher than the recommended design values. A simplified model for the surrounding soil was also proposed in order to attain a less complicated model appropriate for practical design purposes.
机译：本文致力于确定土-结构相互作用对门框式铁路桥梁动力响应的影响。该研究旨在验证数值模型在评估桥土系统动力刚度和模态特性方面的准确性。为了实现此目标，已对全尺寸门框框架桥进行了受控振动测试，以通过测量频率响应函数来确定系统的模态特性。动态测试的结果为有限元模型校准提供了参考数据，并提供了有关此类桥梁动态行为的有价值的信息。利用实验数据，使用基于FRF的模型更新程序来校准涉及整个桥梁轨道-土壤系统的完整3D实体模型。测量和计算的响应都确定了周围土壤对系统整体阻尼的重要贡献，并突出了土-结构相互作用对这种类型桥梁的动态响应的重要性。所确定的与研究桥梁的基本弯曲模式相对应的模态阻尼比比建议的设计值高近5倍。还提出了一种用于周围土壤的简化模型，以便获得适合实际设计目的的较简单模型。

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