隔震曲线连续梁桥粘滞阻尼器参数优化分析  

Parameter optimization analysis of viscous dampers for isolated continuous curved girder bridges

作　　者：王浩[1] 沈惠军 张寒 郑文智 沙奔 李爱群[1] WANG Hao;SHEN Huijun;ZHANG Han;ZHENG Wenzhi;SHA Ben;LI Aiqun(Key Laboratory of Concrete and Prestressed Concrete of Ministry of Education,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室

出　　处：《哈尔滨工程大学学报》2020年第2期282-288,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51578151,57978155);国家“万人计划”青年科技人才项目(W03070080);江苏省重点研发计划(BE2018120)

摘　　要：为了提升粘滞阻尼器在隔震曲线梁桥中的减隔震效果,本文对其力学性能参数进行优化分析。基于ANSYS建立了某三跨隔震曲线连续梁桥的有限元模型,采用非线性动力时程法,分析了粘滞阻尼器速度指数和阻尼系数等参数对地震作用下支座位移和墩底剪力的影响,并确定了粘滞阻尼器参数的合理取值范围。在此基础上,基于零阶优化算法,以墩底剪力绝对值之和为目标函数,对粘滞阻尼器进行了参数优化,并对比分析了优化前后的减震效果。结果表明:阻尼系数对支座位移和墩底剪力的影响十分显著;速度指数对支座位移和墩底剪力的影响与阻尼系数有关;粘滞阻尼器参数优化后,支座切向和径向位移减震率分别在47%和22.2%以上,中墩支座的切向位移减震率高于边墩支座,而边墩支座的径向位移减震率高于中墩支座;边、中墩切向剪力差值由956 kN减小为220 kN,径向剪力差值由441 kN减小为130 kN,其受力相对更为均衡。To improve the seismic performence of viscous dampers in isolated continuous curved girder bridges, the mechanical parameters of viscous dampers are optimized and analyzed. The finite element model of a three-span isolated continuous curved girder bridge is perfermed the basis on ANSYS. The influence of the velocity exponent and damping coefficient of viscous dampers are analyzed using the nonlinear dynamic time history method. The reasonable range of the parameters of viscous dampers are determined using the zero-order optimization algorithm, the parameters of viscous dampers are further optimized, with the sum of the absolute values of the shear force at the bottom of piers as the objective function. Results show that the damping coefficient has a significant effect on the displacement of bearings and the base shearforce of piers. The effect of the velocity exponent on the displacement of bearings and the base shearforce of piers is related to the damping coefficient. After the parameters of viscous dampers are optimized, the reduction ratio for tangential and radial displacement of the bearings reach 47% and 22.2%, respectively. The reduction ratio for tangential displacement of the bearings at the middle piers are higher than those at the side piers. Meanwhile, the damping ratios for radial displacement of the bearings at the side and middle piers are higher than those at the middle piers. The difference of the tangential shear between the side and middle piers is reduced from 956 kN to 220 kN and the difference of the radial shear between the side and middle piers is reduced from 441 kN to 130 kN, which ensure a balanced distribution of force on each pier.

关 键 词：曲线连续梁桥 减隔震 粘滞阻尼器 敏感性分析 参数优化 零阶优化算法 隔震支座 地震响应 

分 类 号：U441[建筑科学—桥梁与隧道工程]