某大跨径钢结构系杆拱桥空间稳定性分析  

Spatial Stability Analysis of a Large-span Steel Structure Tied Arch Bridge

作　　者：张瑞斌 Zhang Ruibin(Shanxi Transportation New Technology Development Co.,Ltd.,Taiyuan 030012,China)

机构地区：[1]山西省交通新技术发展有限公司,太原市030012

出　　处：《北方交通》2022年第11期15-18,共4页Northern Communications

摘　　要：为研究大跨径钢结构拱桥的空间稳定性,以某主跨跨径为80m的下承式钢拱桥为依托,建立迈达斯Civil有限元模型,进行静力及动力分析,得到以下结论:桥梁基频为4.717491rad/s时,桥梁的竖向弯曲振型的出现早于横向扭转,说明该桥梁在设计阶段充分考虑了其横向稳定性,保证了充足的横向稳定性储备;随着模态的增加,桥梁的频率由4.717491rad/s变化为11.52318rad/s,桥梁的频率随着阶次的提升而提高,桥梁的周期由1.331891s变化为0.545265s,桥梁的周期随着阶次的提升而降低;主梁通过受弯的形式传递桥面车辆荷载,大跨径钢拱桥中跨部分荷载可传递至拱肋,拱肋与中跨协同受力且协同变形。In order to study the spatial stability of a large-span steel structure arch bridge,a Midas Civil finite element model is established based on a through steel arch bridge with a main span of 80m,and the static and dynamic analysis is carried out.The following conclusions are obtained:when the fundamental frequency of the bridge is 4.717491rad/s,the vertical bending mode of the bridge appears earlier than the lateral torsion,which indicates that the lateral stability of the bridge is fully considered in the design stage,sufficient lateral stability reserve is ensured;with the increase of the mode,the frequency of the bridge changes from 4.717491rad/s to 11.52318rad/s,the frequency of the bridge increases with the increase of the order,the period of the bridge changes from 1.331891s to 0.545265s,and the period of the bridge decreases with the increase of the order;the main beam transmits the vehicle load of the bridge deck through bending,and the load of the middle span of the large-span steel arch bridge can be transmitted to the arch rib,and the arch rib and the middle span are subject to cooperative stress and deformation.

关 键 词：大跨径钢结构 下承式拱桥 系杆拱桥 空间稳定性 有限元分析 

分 类 号：U448.225[建筑科学—桥梁与隧道工程]