泥石流冲击作用下桥梁结构损伤机理与计算方法研究

项目名称： 泥石流冲击作用下桥梁结构损伤机理与计算方法研究

项目编号： No.51478400

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 建筑环境与结构工程学科

项目作者： 姚昌荣

作者单位： 西南交通大学

项目金额： 80万元

中文摘要： 随着国家经济建设的发展，山区公路、铁路桥梁越来越多，其中有很大一部分位于不良地质区。泥石流灾害以及由此诱发的次生灾害是山区桥梁灾害之一，而当前，国内外对泥石流冲击作用下桥梁结构的计算方法和损伤机理等的研究相对较少，因此有必要开展深入研究。本项目拟以泥石流对桥墩的冲击试验为基础，在时域和频域上分析冲击荷载的特征，建立泥石流对桥墩作用的冲击荷载谱，在此基础上采用流固耦合分析方法研究不同物理条件下泥石流与桥墩的相互作用机理，进而探讨桥墩抗泥石流冲击性能的评估方法和评估指标。本项目的预期研究成果不仅具有重要的理论意义和实际的工程应用价值，而且有利于我国公路、铁路桥梁规范关于泥石流冲击计算方法的完善，并对泥石流区域的桥梁结构设计提供理论依据。

中文关键词： 泥石流；桥梁结构；冲击力谱；抗冲击性能；损伤机理

英文摘要： With the development of national economic construction more and more highway bridges and railway bridges will be built in mountain area, a large part of which locates at the poor geological area. Debris flow disasters and the induced secondary disasters are one of the bridge disasters in mountain area. However, currently, there is relatively little research on damage mechanism and calculation method of bridge caused by debris flow at home and abroad, it is necessary to carry out deep study. Based on the experimentation of bridge piers impacted by debris flows, this project firstly analyzes the features of impact load in the time domain and frequency domain, and the impact load spectrum can be created. Then fluid-structure coupled analysis method can be applied to the study of the interaction mechanism of debris flow and pier. Finally, evaluation methods and evaluation indicators of impact resistance are discussed. Besides important theoretical and practical significance, the expected results of this project are beneficial to improve design specifications of bridges; meanwhile, the results have some referential value to bridge design in debris flow area.

英文关键词： debris flow;bridge structure;impact spectrum;capacity of impact resistance;damage mechanism