超高墩大跨铁路连续钢桁梁桥粘滞阻尼消能减震研究  

Study on seismic performance of a viscously damped continuous steel truss girder railway bridge with super-high-piers and long-span

作　　者：马安财 谭平[3,4] 周福霖[1,3,4] MA Ancai;TAN Ping;ZHOU Fulin(School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Gansu Vocational and Technical College of Communications,Lanzhou 730070,China;Key Laboratory of Earthquake Engineering and Applied Technology in Guangdong Province,Guangzhou University,Guangzhou 510405,China;Key Laboratory of Earthquake Resistance Earthquake Mitigation and Structural Safety Ministry of Education,Guangzhou University,Guangzhou 510405,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]甘肃交通职业技术学院,甘肃兰州730070 [3]广州大学广东省地震工程与应用技术重点实验室,广东广州510405 [4]广州大学工程抗震减震与结构安全教育部重点实验室,广东广州510405

出　　处：《地震工程与工程振动》2021年第3期95-105,共11页Earthquake Engineering and Engineering Dynamics

基　　金：教育部创新团队项目(IRT13057);国家自然科学基金面上项目(51978185);广东省教育厅创新团队项目(2016KCXTD016);广州市高校"羊城学者"首席科学家(1201541630)。

摘　　要：针对某超高墩大跨铁路连续钢桁梁桥,建立了考虑桩-土动力相互作用、超高墩几何非线性P-Δ效应的全桥空间有限元模型,考虑了由于粘滞阻尼的非比例阻尼影响,并通过应变能理论将结构不同部位的振型阻尼引入到分析模型中。基于确定的粘滞阻尼器布置方案,研究了阻尼指数和阻尼系数对结构减震的影响规律,采用参数敏感性分析方法对阻尼器参数进行优化,并分析了其减震性能。研究表明:对于文中分析的桥梁,采用速度指数为0.4的粘滞阻尼器可达到最优的减震效果,能够有效降低各墩水平地震作用,并使高度相近的1、4号墩,以及2、3号墩墩底弯矩和墩顶位移趋于均匀;由于固定墩墩底纵向剪力峰值和非减震模型接近,该类型桥的减震控制应以墩底弯矩和墩顶位移为控制目标;对比基于比例阻尼和非比例阻尼分析模型的地震反应,发现考虑非比例阻尼后超高墩大跨桥梁墩底弯矩和墩顶位移均有所增大,且固定墩墩底弯矩增大更显著,建议进行超高墩大跨粘滞阻尼减震桥梁抗震分析时应考虑非比例阻尼。For the continuous steel truss girder railway bridge with super-high-piers and long-span,a 3-dimensional FEM considering soil-structure interaction and P-Δ effect was established.The influence of non-proportional damping such as viscous damping was considered,the modal damping of different parts of the structure was introduced into the analysis model by strain energy theory.Based on certain layouts of viscous dampers,damping indices were studied and the influence law of damping coefficients on the structural damping was done.The parameter sensitivity analysis method was employed to optimize damper parameters and their damping performance was analyzed.The results show that for the bridge analyzed in this paper,the viscous dampers with velocity indices of 0.4 can achieve the optimal damping effect and effectively reduce the horizontal seismic effect of each pier,and make the bottom moment and top displacement of pier 1 and pier 4,pier 2 and pier 3,which are close to each other,tend to be.As the peak value of longitudinal shear force at the bottom of fixed pier is close to that of the non-damping model,the damping control of this type of bridge should take the bending moment at the bottom of piers and the displacement at the top of piers as the control targets.By comparing the response of the analysis models with proportional damping and non-proportional damping,it is found that the pier bottom moment and the pier top displacement of the long span bridge with ultra-high piers are larger with the consideration of non-proportional damping,especially the increase in the fixed pier bottom moment.It is recommended to consider non-proportional damping in the analysis when building a FEM of a viscously damped bridge with ultra-high piers and long spans.It is suggested that non-proportional damping should be considered in the seismic analysis of super-high-piers and long-span viscous damping Bridges.

关 键 词：超高墩大跨连续钢桁梁桥 非比例阻尼 消能减震 参数优化 减震性能 

分 类 号：U488.13[交通运输工程—载运工具运用工程] U442.55[交通运输工程—道路与铁道工程]