不同风速下钢管混凝土系杆拱桥力学特性分析  

Analysis of Mechanical Characteristics of Concrete-filled Steel Tubular Arch Bridge at Different Wind Speed

作　　者：黄汉义 HUANG Han-yi(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《兰州工业学院学报》2018年第2期10-13,共4页Journal of Lanzhou Institute of Technology

摘　　要：以一座计算跨径为122 m竖直吊杆钢管混凝土系杆拱桥为依托,建立了Midas有限元结构分析模型.分别考虑不同横向风荷载作用,对拱肋、横撑及拱脚力学性能分析,得到如下结论:张拉吊杆施工阶段风荷载对横向位移影响平缓,最大值发生在1/4拱肋截面,风速5、10 m/s时对拱肋横向位移影响甚小,风速达到30 m/s时拱肋拱顶侧向位移最大接近14 mm,增幅明显;相同风速下,拱肋轴力、横撑轴力在吊杆张拉各阶段基本无变化;风速20 m/s以内横撑轴力较小,风速影响不明显,当达到30 m/s时,轴力增大显著达到500 k N;拱脚内力随着风速增加呈现快速增大,最大达到50 k N·m.This paper is based on a span steel vertical tied arch bridge with a span of 122m and a finite element structural analysis model of MIDAS was established.Mechanical properties of arch rib,transverse bracing and arch foot were analyzed respectively under different lateral wind loads,The results show that:In the construction stage of the suspender,the wind load has a slight influence on the lateral displacement,and the maximum value occurs at the section of the 1/4 arch rib.When the wind speed reaches 5m/s or 10m/s,the influence of lateral displacement on arch rib is very small,but when the wind speed reaches 30m/s,the maximum lateral displacement of arch rib vault is close to 14mm,and the increase is obvious.Under the same wind speed,the axial force of the arch rib and the axial force of the transverse bracing have no change at all stages of the suspender tensioning.The wind speed is less than 20m/s,the axial force of the transverse bracing is smaller,and the wind speed has no obvious influence on the axial force.When 30m/s is reached,the axial force increases to 500KN significantly.The internal force of arch foot increases rapidly with the increase of wind speed,and the maximum reaches 50KN·m.

关 键 词：竖直吊杆 系杆拱桥 横向风荷载 力学性能 

分 类 号：U24[交通运输工程—道路与铁道工程]