大跨径斜拉桥施工阶段临时抗风措施对比分析  

Comparative Analysis of Temporary Wind-resistant Measures for Long-span Cable-stayed Bridge at Construction Stage

作　　者：刘旭政[1] 曾健峰 王丰平 LIU Xuzheng;ZENG Jianfeng;WANG Fengping(State Key Laboratory of Performance Monitoring Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang,Jiangxi 330013,China;Central&Southern China Municipal Engineering Design and Research Institute Co.Ltd,Wuhan,Hubei 430010,China;Zhejiang Institute of Communications Co.Ltd,Hangzhou,Zhejiang 310006,China)

机构地区：[1]华东交通大学轨道交通基础设施性能监测与保障国家重点实验室,南昌330013 [2]中国市政工程中南设计研究总院有限公司,武汉430010 [3]浙江数智交院科技股份有限公司,杭州310006

出　　处：《铁道工程学报》2024年第1期39-44,52,共7页Journal of Railway Engineering Society

基　　金：国家自然科学基金(52068026,52068025);江西省自然科学基金(20232BAB204070,20232BAB204071)。

摘　　要：研究目的:大跨径斜拉桥在最大双悬臂施工状态下结构刚度较小,对风荷载引起的结构风致振动响应较为敏感。本文以受沿海台风影响区域的一座主跨316 m斜拉桥为研究对象,根据风洞试验确定主梁的气动三分力系数,对比分析不同风缆布置方案与不同临时墩布置方式对大桥风致响应控制效果的影响。研究结论:(1)增设临时风缆可使主梁竖弯基频提高22.0%~32.5%,对结构自身的扭转基频影响效果不显著;临时风缆对主梁竖向位移和主塔顺桥向位移控制有一定作用,固定位置在主梁最大悬臂长度的80%~90%范围内效果较好;(2)临时墩的抗风减振效果显著优于临时风缆,临时墩的设置使主梁悬臂端竖向位移响应降低了53.5%~65.5%,对主梁悬臂根部的顺桥向弯矩与横桥向弯矩的控制效果较为明显,降幅11.7%~58.8%;(3)在选择桥梁临时抗风措施时,需综合考虑抗风需求、施工条件、施工风险和经济性;(4)本研究成果可为大跨度斜拉桥临时抗风措施的选择提供参考。Research purposes:The long-span cable-stayed bridge has low structural rigidity under the maximum double-cantilever construction state and is relatively sensitive to the wind-induced vibration.To study the wind-resistant measures for long-span cable-stayed bridge,the aerodynamic tri-component force coefficients of a cable-stayed bridge with 316 m length of main span,located at coastal typhoons impact area,are determined with the wind-tunnel test result,and the structural wind-induced responses are analyzed with different wind-resistant measures,including temporary wind cables and temporary piers.Research conclusions:(1)Using the temporary wind cables measurement,the vertical bending fundamental frequency of the main girder is raised with 22.0%~32.5%,and the torsional fundamental frequency has no significant change;the vertical displacement of the beam and the longitudinal displacement of the pylon are relatively reduced,the fix position of the wind cable is recommended from 80%to 90%range of the maximum cantilever length.(2)The wind vibration reduction effect of the temporary pier is significantly better than that of the temporary wind cable.Using the temporary piers measurement,the maximum reduction of the vertical displacement response of the main girder is range from 53.5%to 65.5%,and the longitudinal and transverse bending moment of the main girder at the pylon position is reduced from 11.7%to 58.8%.(3)The selection of wind resistance measures should be considered with wind-resistance requirements,construction environment,construction risks and economy costs.(4)The research results can provide reference to the wind-resistance measurement selection of long-span cable-stayed bridges。

关 键 词：斜拉桥 最大双悬臂施工状态 临时墩 临时风缆 风致响应 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]