风屏障透风率对强风作用下重载铁路刚构-连续梁车桥耦合振动响应的影响  

Study on the Influence of Wind Barrier Porosity on Train-Bridge Coupling Vibration of Heavy-Haul Railway of Rigid Frame-Continuous Beam under Strong Wind

作　　者：郭向荣[1] 查万祺 何旭辉[1] GUO Xiangrong;ZHA Wanqi;HE Xuhui(School of Civil Engineering,Central South University,Changsha Hunan 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075

出　　处：《中国铁道科学》2024年第4期57-65,共9页China Railway Science

基　　金：国家自然科学基金资助项目(51925808);中国国家铁路集团有限公司科技研究开发计划课题(N2022Z004)。

摘　　要：为探究风屏障透风率对强风作用下重载铁路刚构-连续梁车桥耦合振动的影响,先通过节段模型风洞试验获取桥上设置0%,20%,40%,60%和无风屏障5种不同透风率风屏障时车桥系统的三分力系数,再根据弹性系统动力学总势能不变原理建立风-车-桥耦合振动仿真计算分析模型,对不同车速下重载货运列车通过设置不同透风率风屏障刚构-连续梁桥开展风-车-桥系统动力学仿真计算与分析研究。结果表明:在列车上桥初期,桥梁横向位移峰值随透风率的增大而明显减小,而当列车运行趋于满布桥梁时,桥梁的横向位移峰值随透风率的增大变化不明显;列车的动力响应峰值随风屏障透风率的增大而增大,相比于满载编组列车,空载和轻重混编编组列车的动力响应对风屏障透风率的变化更加敏感。综合桥梁动力响应和列车走行安全性评价指标(脱轨系数和轮重减载率),该桥梁应设置40%透风率的风屏障。To investigate the effect of wind barrier porosity on the train-bridge coupling vibration of heavy-haul railway of rigid frame-continuous beam under strong wind,the aerostatic coefficients of the train-bridge system were obtained through section model wind tunnel tests when five different pored wind barriers were installed on the bridge,namely 0%,20%,40%,60%,and 100%(without wind barriers).Then the simulation calculation and analysis models of wind-train-bridge coupling vibration were established according to the principle of total potential energy with stationary value in elastic system dynamics.The dynamic simulation calculation and analysis of the wind-train-bridge system for heavy freight trains at different running speeds was carried out by setting the rigid frame-continuous beam bridge with wind barriers at different porosity.The results show that the peak lateral displacement of the bridge significantly decreases with the increase of porosity in the early stage of train operation on the bridge,while the peak lateral displacement of the bridge barely change with the increase of porosity when the train operation tends to fill the bridge.For the dynamic response of trains,the peak value of the train dynamic response increases with the increase of the wind barrier porosity.Compared with fully loaded trains,the dynamic response of unloaded and mix-marshalling freight trains is more sensitive to changes in the wind barrier porosity.Considering the dynamic response of bridge and the evaluation indexes for train running safety(derailment coefficient and wheel load reduction rate),it is recommended to set up a wind barrier with 40%porosity rate for the bridge studied in this paper.

关 键 词：重载铁路 刚构-连续梁桥 风屏障 透风率 风车桥耦合振动 行车安全 

分 类 号：U441[建筑科学—桥梁与隧道工程]