高速铁路模型箱梁静力非线性和动力损伤关系研究  

Research on the Relationship of the Dynamic Characteristics and Static Performance of High-Speed Railway Box Girder Model under Repeated Loading

作　　者：葛继平[1] 沈磊[1] 王志强 严平 

机构地区：[1]上海应用技术学院城市建设与安全工程学院,上海200235 [2]同济大桥桥梁工程系,上海200092 [3]中建国际(深圳)设计顾问有限公司,上海200235

出　　处：《武汉理工大学学报（交通科学与工程版）》2013年第6期1171-1175,共5页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：铁道部科技研究开发计划项目(批准号:2010G007-J);国家自然科学基金项目(批准号:51178350);上海市教委重点学科建设项目(批准号J51502);上海应用技术学院硕士点培育建设项目(批准号:405ZK12006000102)资助

摘　　要：基于高速铁路模型箱梁的重复荷载试验,采用平面非线性有限元分析方法对静力非线性和动力损伤之间的关系进行了研究.通过定义混凝土等效应力-等效塑性应变曲线来定义其弹塑性行为.对数值模型加载到各级荷载后卸载进行动力特性分析,即卸载后计算自振频率和振型.计算结果表明:采用平面非线性有限元分析方法可以比较准确地对箱梁模型进行非线性分析,除了初始模型刚度存在一定误差外,结构的骨架曲线的特征值、加卸载刚度和残余位移吻合较好.在进行非线性分析后进行动力特性是分析可行.竖向频率值的变化能够反映静力非线性发生后结构的损伤出现和损伤的发展规律,这为结构动力损伤识别提供了有效的途径.The relationship between nonlinear response under static loads of bridge structures and dynamic characteristics is important issue in the areas of structural damage identification. Based on model test of high-speed railway girder under repeated loading, the relationship between nonlinear and dynamic characteristic using planar nonlinear finite element method has been studied. The elastic-plastic behavior of concrete is defined by the equivalent stress and equivalent plastic strain. After the numerical model is unloaded from different load levels, the mode analysis is performed, that is the vibration frequency and mode shape is calculated after unloading. The results show that the non-linear characteristic of box girder can be modeled accurately using the planar nonlinear finite element analysis method. The characteristic values of skeleton curve, loading and unloading stiffness and the residual displacement from finite element method are in good agreement with that from experiment, except model error in the initial stiffness. The modal analysis based on static nonlinear analysis is practicable. The value changes of vertical frequency can reflect the occurrence of static nonlinear structural damage and the law of damage development. That is an effective way to damage identification from dynamic characteristics of structural.

关 键 词：损伤识别 动力特性 预应力混凝土箱梁 非线性分析 模型试验 

分 类 号：U24[交通运输工程—道路与铁道工程] TU311.41[建筑科学—结构工程]