不同垂度四主缆悬索桥车辆荷载效应分析  

Analysis of Vehicle Load Effect in Four-Cable Suspension Bridge with Different Sag

作　　者：赵鑫莹 王意平 阮欣[1] 柳文策 ZHAO Xinying;WANG Yiping;RUAN Xin;LIU Wence(Department of Bridge Engineering,Tongji University,Shanghai 200092,China;Hubei Communications Investment Yanji Yangtze River Bridge Co.,Ltd.,Hubei 438000,China;CCCC Highway Bridge National Engineering Research Centre Co.,Ltd.,Beijing 100000,China)

机构地区：[1]同济大学桥梁工程系,上海200092 [2]湖北交投燕矶长江大桥有限公司,湖北438000 [3]中交公路长大桥建设国家工程研究中心有限公司,北京100000

出　　处：《结构工程师》2025年第1期25-33,共9页Structural Engineers

基　　金：湖北交通投资集团有限公司科技项目(HBJTKJ-47-2022001);中国交通建设集团重大研发项目(2021);国家自然科学基金面上项目(GN51878495)。

摘　　要：不同垂度四主缆悬索桥结构体系在平行四主缆悬索桥的基础上,解决了桥塔高度受限的建设难题,将下主缆降低到桥面下以最大限度加大主缆垂度。主缆作为悬索桥关键承重构件,其在汽车荷载作用下的轴力效应值得关注。以国内某在建的不同垂度四主缆超大跨悬索桥为研究对象,采用软件ANSYS构建了结构空间有限元模型,基于现有规范与随机车流分析了四主缆在车辆荷载作用下的受力特征。结果表明:恒载在上下缆的分配基本上是均匀的。对称汽车荷载作用下,下缆相对于上缆将承担更多的汽车荷载,分配比例约为26.2%,上缆约为23.8%。不对称荷载作用下,作用侧下缆承担轴力最大可达到总主缆轴力的34.6%,较对称荷载作用下提高约32%。不同垂度主缆汽车荷载分配比例与交通量和车重分布变化无关。On the basis of the parallel four-cable suspension bridge,four-cable suspension bridge with different sag solves the construction problem of limited height of the bridge tower,and lowers the main cable under the deck to maximize the sag of the main cable.As the critical load-bearing member of the suspension bridge,the axial force effect of the main cable under vehicle load deserves attention.Taking a four-cable super-span suspension bridge with different sag under construction in China as the research object,a structural finite element model is constructed by ANSYS,and the mechanical performance of four cables under vehicle load is analyzed.The results show that the distribution of dead load in cables with different sag is uniform.Under the action of symmetrical vehicle load,the lower cable will bear more vehicle load,with a distribution ratio of about 26.2%and the upper cable about 23.8%.Under the action of asymmetric load,the axial force of the lower cable on the action side can reach 34.6%of the total axial force,which is about 32%higher than that under the symmetrical load.The load distribution ratio of vehicles is independent of the change of traffic volume and the weight distribution.

关 键 词：悬索桥 不同垂度 四主缆 车辆荷载 轴力分配 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]