摘要
全封闭式屏障相较普通墙式透孔式屏障具有更好的隔音与防风性能,近年在铁路与轨道桥梁中应用广泛。然而,全封闭式屏障体积较大,透风率较低,可能显著影响主梁气动外形与抗风性能。因此,为评价全封闭式屏障对大跨桥梁抗风性能的影响,本研究以某在建公铁两用双层悬索桥为工程背景,采用风洞试验与数值计算方法,研究全封闭式屏障对主梁气动力系数、涡激振动、颤振稳定性与抖振响应等关键抗风性能的影响。研究结果表明:全封闭式屏障对双层桁架梁的气动力参数影响较明显,阻力与升力系数增加,力矩系数减小;设置全封闭式屏障可能诱发主梁的涡激振动,但对颤振稳定性未观察到显著影响;设计风速下,全封闭式屏障会增加主梁静风位移,并显著改变主梁抖振响应。
Fully enclosed barriers are widely used in highway and railway double-deck truss bridges in recent years due to their superior sound insulation and windproof performance compared to common wall perforated barriers.However,the larger size and lower wind permeability of fully enclosed barriers may have a significant affect on the girder's aerodynamic shape and wind resistance performance.Therefore,to evaluate the effect of fully enclosed barriers on the wind resistance performance of large-span bridges,this study investigates the effect of fully enclosed barriers on the key wind resistance performance such as aerostatic coefficients,vortex-induced vibration(VIV) performance,and flutter stability and buffeting response,by using a highway and railway double-deck suspension bridge under construction as the engineering background,and wind tunnel test and numerical calculation methods.The results indicate that the fully enclosed barrier has a significant impact on the aerodynamic parameters of the double-deck truss girder,leading to an increase in drag and lift coefficients and a decrease in the moment coefficient.The installation of the fully enclosed barrier may induce the vortex-induced vibration of the girder,but no significant effect on the flutter stability is observed.Under the design wind speed,the fully enclosed barrier increases the static wind displacement of the main girder and significantly changes its chattering response.
作者
遆子龙
杨凌
李永乐
潘俊志
Ti Zilong;Yang Ling;Li Yongle;Pan Junzhi(Key Laboratory of Railway Industry on Disaster Prevention and Mitigation for Railways in Special and Complex Mountains,Southwest Jiaotong University,Sichuan,Chengdu 610031,China)
出处
《铁道技术标准（中英文）》
2023年第6期33-41,共9页
Railway Technical Standard(Chinese & English)
基金
国家自然科学基金(52008349)
四川省自然科学基金项目(22NSFSC0857)。
关键词
全封闭屏障
公铁双层桁架桥
风洞试验
抗风性能
fully enclosed barrier
highway and railway doubledeck truss bridge
wind tunnel test
wind resistance performance
