山区大跨钢桁梁悬索桥阻尼器减震体系优化研究  

Research on Optimization of Damper System for Long-span Suspension Bridge with Steel Truss Girder in Mountainous Area

作　　者：龙平江 杜镔[2] 唐志[2] 张剑锋 LONG Pingjiang;DU Bin;TANG Zhi;ZHANG Jianfeng(Guizhou Expressway Group Co.,Ltd.,Guiyang 550001,China;Guizhou Transportation Planning Survey&Design Academe Co.,Ltd.,Guiyang 550081,China)

机构地区：[1]贵州高速公路集团有限公司,贵阳550025 [2]贵州省交通规划勘察设计研究院股份有限公司,贵阳550081

出　　处：《交通科技》2022年第4期51-55,共5页Transportation Science & Technology

摘　　要：为探究黏滞阻尼器对山区大跨径钢桁梁悬索桥的减震效果,同时为阻尼器参数设计和优化提供依据,以开州湖特大桥为工程背景,采用非线性时程分析法开展了黏滞阻尼器对山区大跨径钢桁梁悬索桥地震响应研究,并对阻尼器的设计参数进行优化。研究表明,设置阻尼器后塔底弯矩、剪力较未设时有明显减小,减小约25%;纵向位移与跨中竖向位移均有明显减少,梁端纵向最大位移降低约60%,加劲梁竖向最大位移减少50%,且阻尼系数越大,位移优化效果越好,阻尼指数越小,位移越小;阻尼器优化后的设计参数选取为阻尼系数C=3000 kN、阻尼指数ξ=0.3、阻尼力2500 kN;阻尼行程900 mm。To explore the shock absorption effect of viscous dampers on large-span steel truss girder suspension bridges in mountainous areas,and provide a basis for the design and optimization of damper parameters,a nonlinear time-history analysis is carried out based on the Kaizhou Lake Bridge engineering project.The seismic response of the viscous damper to the long-span steel truss girder suspension bridge in mountainous area is studied,and the design parameters of the damper are optimized.The research shows that the bending moment and shear force at the bottom of the tower with the dampers are obviously reduced by about 25%compared with those without dampers.The longitudinal displacement and the vertical displacement in the middle of the span are significantly reduced.The maximum longitudinal displacement at the beam end is reduced by about 60%,and the maximum vertical displacement of the stiffening beam is reduced by 50%.The larger the damping coefficient is,the better the displacement optimization effect is,and the smaller the damping index is,the smaller the displacement is.In addition,the optimized design parameters of the damper are selected as follows:the damping coefficient C is 3000,damping index is 0.3,damping force is 2500 kN,and the damping stroke is 900 mm.

关 键 词：钢桁梁悬索桥 SAP2000有限元 阻尼器 桥塔 内力 

分 类 号：U448[建筑科学—桥梁与隧道工程]