考虑摩擦耗能的桥梁盆式橡胶支座三维有限单元构建  

Construction of 3D Finite Element of Bridge Pot Rubber Bearing Considering Friction Energy Dissipation

作　　者：魏思聪 李鹏飞[1] 董振华[1] 梅波 罗吉庆 WEI Si-cong;LI Peng-fei;DONG Zhen-hua;MEI Bo;LUO Ji-qing(Research Institute of Highway,Ministry of Transport,Beijing 100088,China;Guangdong Provincial Highway Construction Co.,Ltd.,Dongguan Guangdong 510660,China)

机构地区：[1]交通运输部公路科学研究院,北京100088 [2]广东省公路建设有限公司,广东东莞510660

出　　处：《公路交通科技》2022年第10期64-74,共11页Journal of Highway and Transportation Research and Development

基　　金：中央级公益科研院所基本科研业务费项目(2021-9083b);国家自然科学基金项目(52178449)。

摘　　要：为了方便、快捷和准确地在桥梁有限元建模中考虑支座摩擦的影响,完善桥梁动力数值分析方法,增进对桥梁动力特性的认识,更好地模拟实际条件下桥梁动力响应,同时,为了得到实际工况下支座摩擦的响应,增进对支座的损耗、劣化机理的认识,合理估计支座寿命及维护周期,改进支座设计和使用方法,基于Bouc-Wen滞回模型和以往对钢-聚四氟乙烯(PTFE)界面摩擦机理的研究及相关摩擦试验数据,对动力条件下盆式橡胶支座的滑动摩擦进行了分析。通过拓展Bouc-Wen滞回模型应用范围,构建了一套完整描述桥梁盆式橡胶支座任意方向滑动摩擦的数学模型,给出了该数学模型的显式和隐式数值解法。基于该数学模型,开发了一种适用于桥梁有限元动力分析的桥梁盆式橡胶支座三维2节点有限单元,该有限单元各项工作性能符合理论预期。参照以往试验,设置有限单元参数进行了动力摩擦计算。结果表明:试验参数设置准确时,采用支座有限单元计算的支座摩擦动力响应与理论预期和相关试验数据吻合较好,且该单元的工作性能满足桥梁结构动力分析要求,适用性较好。In order to conveniently, quickly and accurately consider the influence of bearing friction in the bridge finite element modelling, improve the bridge dynamic numerical analysis method, improve the understanding of the bridge dynamic characteristics, and better simulate the bridge dynamic response under actual conditions, and in order to obtain the friction response of the bearing under the actual working condition, improve the understanding of the loss and deterioration mechanism of the bearing, reasonably estimate the bearing life and maintenance cycle, improve the bearing design and usage method, based on Bouc-Wen hysteretic model, previous research on the friction mechanism of steel polytetrafluoroethylene(PTFE) interface and relevant friction test data, the sliding friction of pot rubber bearing under dynamic condition is analyzed. By expanding the application scope of Bouc-Wen hysteretic model, a set of mathematical models for fully describing the sliding friction of the pot rubber bearing in any direction are established, and the explicit and implicit numerical solutions of the mathematical models are given. Based on the mathematical model, a kind of 3 D 2-node finite element of bridge pot rubber bearing suitable for bridge finite element dynamic analysis is developed. The performance of this finite element is in line with theoretical expectation. Referring to the previous experiments, the dynamic friction calculation is carried out after setting the finite element parameters. The result shows that when the test parameters are set accurately, the friction dynamic response of the bearing calculated by the finite element of the bearing is in good agreement with the theoretical expectation and the relevant test data, and the working performance of the element meets the requirements of the dynamic analysis of the bridge structure, its applicability is good.

关 键 词：桥梁工程 盆式橡胶支座三维有限单元 Bouc-Wen滞回模型 支座摩擦 滞回现象 结构动力分析 

分 类 号：U443.361[建筑科学—桥梁与隧道工程]