考虑风屏障影响的大跨度铁路悬索桥横向挠跨比限值研究  

Study on Transverse Deflection-span Ratio Limit of Long-span Railway Suspension Bridge Considering Wind Barrier

作　　者：向活跃[1,2] 陶宇 陈绪黎 胡浩 李永乐[1,2] XIANG Huoyue;TAO Yu;CHEN Xuli;HU Hao;LI Yongle(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Wind Engineering Key Laboratory of Sichuan Province,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]西南交通大学风工程四川省重点实验室,四川成都610031

出　　处：《铁道学报》2023年第3期62-69,共8页Journal of the China Railway Society

基　　金：国家自然科学基金(51978589);四川省科技计划(2022YFG0256)。

摘　　要：为研究风屏障对大跨度铁路悬索桥横向刚度的影响,以某主跨1 060 m的铁路悬索桥为例,采用风洞试验测试车桥系统气动特性,通过改变加劲梁横向截面惯性矩实现不同的横向刚度,采用风-车-桥耦合振动分析方法,研究大跨度铁路悬索桥的横向挠跨比限值,讨论风屏障高度、车速及桥梁跨度的影响,在考虑激励随机性影响的基础上按规范加载条件得到桥梁横向挠跨比限值。结果表明:车速越高,桥梁跨径越小,横向挠跨比限值越严格;在不同跨度和车速条件下,风屏障均可提高横向挠跨比限值,其中设置3.5 m高度风屏障时,横向挠跨比限值可提升约9%,且当车速为200 km/h时,横向挠跨比限值可取为1/1 200。To investigate the effect of the wind barrier on the transverse stiffness of long-span railway suspension bridges,based on the example of a 1060 m-span railway suspension bridge,the wind tunnel test was conducted to test the aerodynamic characteristics of the train-bridge system.By changing the moment of inertia of the transverse section of the stiffening girder,different transverse stiffness was achieved.The analytical method of wind-vehicle-bridge coupled vibration was used to study the transverse deflection-span ratio limit of long-span railway suspension bridges,as well as the influence of the height of wind barriers,train speed and bridge span.Considering the influence of excitation randomness,the transverse deflection-span ratio limit of long-span railway suspension bridges was obtained based on the standard loading conditions.The results show that the requirement of the transverse deflection-span ratio limit is stricter for the higher train speed and the smaller bridge span.Under the conditions of different spans and vehicle speeds,the wind barrier can increase the transverse deflection-span ratio limit.Especially,a 3.5 m high wind barrier can increase the transverse deflection-span ratio limit by about 9[WTB4]%,and the transverse deflection-span ratio limit is 1/1200 at a train speed of 200 km/h.

关 键 词：风屏障 大跨度铁路悬索桥 横向刚度 横向挠跨比 风-车-桥系统 

分 类 号：U24[交通运输工程—道路与铁道工程]