基于MR阻尼器的大跨斜拉桥碰撞效应减震控制  

Seismic Control of Large Span Cable-stayed Bridges Based on MR Dampers for Collision Effects

作　　者：向敏[1] 吴琼[1] 杨从娟[1] 郭进[1] XIANG Min;WU Qiong;YANG Congjuan;GUO Jin(Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China)

机构地区：[1]石家庄铁道大学,石家庄050043

出　　处：《铁道工程学报》2023年第11期42-49,共8页Journal of Railway Engineering Society

基　　金：国家自然科学基金面上项目(52178493);河北省重点研发计划项目(21375402D)。

摘　　要：研究目的:漂浮体系大跨度斜拉桥纵向约束较弱,在地震作用下其梁端会产生较大纵向位移,引起碰撞,因此需采取合适的控制措施。本文以一座大跨度公铁两用双塔斜拉桥主引桥为工程背景,针对地震作用下主引桥的碰撞问题,将MR阻尼器引入该桥,通过SIMULINK建模,采取被动、半主动和智能模糊控制等不同的控制措施,研究MR阻尼器在该斜拉桥主引桥碰撞问题中的减震控制效果,以探究最佳控制方案。研究结论:(1)通过将七种控制策略分别与无控下结构的纵向位移响应相对比,可发现半主动控制与被动控制减震效果相接近,模糊逻辑控制效果最佳;(2)从碰撞力响应可看出,七种控制策略均能使主引桥之间的碰撞次数及碰撞力峰值减小,其中半主动控制与模糊逻辑控制的减震效果要优于被动控制;(3)从阻尼器耗能可看出,模糊控制的能量输入要远远小于被动控制和半主动控制;(4)本研究结论可供类似桥梁的主引桥碰撞控制参考和借鉴。Research purposes:The longitudinal restraint of long-span cable-stayed bridge with floating system is weak,and its beam end will produce large longitudinal displacement and cause collision under the action of earthquake.Therefore,appropriate control measures need to be taken.Taking the main approach bridge of a long-span highway rail dual-purpose double tower cable-stayed bridge as the engineering background,aiming at the collision problem of the main approach bridge under earthquake,this paper introduces MR damper into the bridge.Through SIMULINK modeling,different control measures such as passive,semi-active and intelligent fuzzy control are adopted to study the damping control effect of MR damper in the collision problem of the main approach bridge of the cable-stayed bridge,so as to explore the best control scheme.Research conclusions:(1)By comparing the seven control strategies with the longitudinal displacement response of thestructure without control,it can be found that the damping effect of semi-active control is close to that of passive control,and the effect of fuzzy logic control is the best.(2)From the impact force response,it can be seen that the seven control strategies can reduce the number of collisions and the peak value of impact force between the main approach bridges,among which the damping effect of semi-active control and fuzzy logic control is better than that of passive control.(3)From the energy dissipation of damper,it can be seen that the energy input of fuzzy control is far less than that of passive control and semi-active control.(4)The conclusions of this paper can be used as a reference for the collision control of the main approach bridge of similar bridges.

关 键 词：斜拉桥 碰撞效应 磁流变阻尼器 半主动控制 模糊控制 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]