近场脉冲效应下悬索桥防屈曲中央扣减震耗能研究  

Energy Dissipation of Near-Field Pulse Effect Ground Motions on Buckling-Restrained Central Buckle of Suspension Bridge

作　　者：段佳宏 冉志红 刘振宇 曹发辉 林帆 赵怀刚 DUAN Jiahong;RAN Zhihong;LIU Zhenyu;CAO Fahui;LIN Fan;ZHAO Huaigang(School of Architecture and Planning,Yunnan University,Kunming 650500,China;Department of Civil Engineering,Sichuan province Communications Department Highway Planning Survey Design And Research institute,Chengdu 610064,China;Department of Resource Development Engineering,Faculty of Land Resources Engineering,Kunming University of Science Technology,Kunming 650000,China)

机构地区：[1]云南大学建筑与规划学院土木工程系,昆明650500 [2]四川省交通厅公路规划勘察设计院,成都610064 [3]昆明理工大学国土资源工程学院资源开发工程系,昆明650000

出　　处：《结构工程师》2019年第6期134-141,共8页Structural Engineers

基　　金：国家自然科学基金资助项目(51968074);云南省交通厅科研项目(云交科2016(A)02)。

摘　　要：为了探讨悬索桥在近场脉冲作用下防屈曲中央扣的耗能作用,以泸定大渡河特大桥为研究对象,建立该桥的6种不同形式中央扣的动力计算模型,研究其动力特性、地震响应和防屈曲中央扣的耗能能力。研究表明:防屈曲中央扣能提高悬索桥结构的主要振型的频率;有脉冲地震动对悬索桥这种柔性结构的地震响应有明显地放大现象;防屈曲中央扣相比于普通中央扣因其出色的耗能能力,能有效减小加劲梁纵向位移和塔顶纵向位移,小幅减小主塔底部纵向剪力和弯矩,但上弦杆应力也明显增大,综合比较防屈曲中央扣减震效果更好。To investigate the energy dissipation function of buckling-restrained central buckle of suspension bridge undemear-field pulsed ground motions,taking the Dadu River Bridge in Luding as an example,the dynamic finite element models for the Bridge of six types of central buckle are established.Dynamics behavior,seismic response and the energy dissipation of buckling-restrained central buckle for the bridge are carried out.The study shows that the buckling-restrained center buckle can increase the frequency of the principal mode shapes of the suspension bridge structure;the pulsed ground motion can significantly increase the seismic response of the suspension bridgesas flexible structures;the buckling-restrained central buckle which has excellent energy dissipation compared with normal central buckle,can effectively reduce the longitudinal displacement of the stiffening beam and the tower top and slightly decrease the longitudinal shear force and moment at the bottom of the tower,but the stress of the top chord increases obviously.With comprehensive comparison,it shows that the buckling-TestTained central buckle has better performance at damping effect.

关 键 词：近场脉冲效应 悬索桥 防屈曲中央扣 地震响应 减震耗能 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U448.25[交通运输工程—道路与铁道工程]