三主桁断面车-桥气动特性的风洞试验研究  

Wind tunnel tests of aerodynamic characteristics of vehicle-bridge with 3-main truss section coupled system

作　　者：韩旭 向活跃[1,2] 罗扣 李永乐[1,2] HAN Xu;XIANG Huoyue;LUO Kou;LI Yongle(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Sichuan Provincial Key Lab of Wind Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.,Wuhan 430050,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]风工程四川省重点实验室,成都610031 [3]中铁大桥勘测设计院集团有限公司,武汉430050

出　　处：《振动与冲击》2022年第7期268-275,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(51778544,51978589,51908077)。

摘　　要：为研究三主桁断面车-桥组合系统的气动特性。以某大跨度斜拉桥为工程背景,采用节段模型风洞试验,通过开发的车-桥气动力同步测试装置对车-桥组合状态下各自的气动力进行测试,研究了线路位置、双车交会间距、风攻角等因素对车-桥系统气动特性的影响,分析紊流来流对车-桥气动特性的影响,并讨论列车气动导纳的特征。结果表明:由于绕流剪切层的影响,靠近迎风侧车辆阻力系数大于其他线路,线路2上列车的升力系数最大;双车交会时,背风侧车辆的阻力系数和升力系数随交会间距的增大而增大;受桁架自身绕流的影响,紊流来流对列车气动力功率谱影响较小;阻力和升力的气动导纳随折减频率呈现先增后减的趋势。Here,to study aerodynamic characteristics of vehicle-bridge with 3-main truss section system,taking a certain long-span cable-stayed bridge as the engineering background,segmental model wind tunnel tests were used to measure aerodynamic forces of vehicle and bridge under their combined state with the developed vehicle-bridge aerodynamic force synchronous test device,study effects of line position,double-vehicle intersection spacing,wind attack angle and other factors on aerodynamic characteristics of the vehicle-bridge system,analyze effects of turbulent coming flow on vehicle-bridge system aerodynamic characteristics,and discuss characteristics of train aerodynamic admittance.The results showed that due to effects of flow around shear layer,vehicle drag coefficient near windward side is larger than those on other lines,and train lift coefficient on line 2 is the largest;when two-vehicle intersect,drag coefficient and lift coefficient on vehicle leeward side increase with increase in intersection spacing;due to effects of flow around truss itself,turbulent coming flow has less impact on train aerodynamic force power spectrum;aerodynamic admittances of drag and lift increase firstly and then decrease with increase in reduction frequency.

关 键 词：三主桁断面 车-桥系统 气动特性 同步测试装置 气动导纳 风洞试验 

分 类 号：U24[交通运输工程—道路与铁道工程] U270.1[机械工程—车辆工程]