吊杆损伤对大跨径斜靠式拱桥稳定性影响  

Effect of Boom Damage on the Stability of Long-span Inclined Arch Bridges

作　　者：闵学峰 李海涛[1] MIN Xuefeng;LI Haitao(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan Anhui 232001,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《佳木斯大学学报（自然科学版）》2024年第5期94-97,共4页Journal of Jiamusi University：Natural Science Edition

基　　金：安徽省教育厅高校自然科学研究项目(KJ2021A0608)。

摘　　要：斜靠式拱桥作为一种新型结构的拱桥值得研究,并且由于其独特的吊杆布置方式,吊杆损伤对稳定性影响目前需要不够了解。以跨径130m,高26m,宽44.4m的斜靠式系杆拱桥为例,采用有限元模拟的方法对拱桥不同位置吊杆损伤以及应力变化情况做出具体研究和分析。得到结论,在斜靠式拱桥4号吊杆位置处吊杆断裂对拱桥稳定性影响最大,并且偏荷载使得拱桥安全系数整体下降,在偏荷载一侧桥型屈曲波动较大。主拱吊杆在吊杆断裂时受到的应力更大,也更容易发生断裂,在靠近拱脚处的短吊杆受到的应力最大断裂后向相邻吊杆释放的冲力也越大。稳定拱吊杆在一定程度上影响拱桥稳定性,但是在断裂后向相邻位置稳定拱吊杆和对应位置主拱吊杆冲力更小,不容易发生连锁性破坏。最后得出结论,主拱吊杆承载应力更大也更容易发生破坏,需要着重加固靠近拱脚位置吊杆。As a new type of arch bridge,the reclining arch bridge is worthy of study,and due to its unique boom arrangement,the impact of boom damage on stability needs to be under understood.Taking the reclining tied arch bridge with a span diameter of 130m,a height of 26m and a width of 44.4m as an example,the finite element simulation method was used to study and analyze the damage and stress changes of the boom at different positions of the arch bridge.It is concluded that the suspension rod fracture has the greatest impact on the stability of the arch bridge at the position of the No.4 boom of the inclined arch bridge,and the partial load makes the overall safety factor of the arch bridge decrease,and the buckling fluctuation of the bridge type is large on the side of the partial load.The main arch boom is more stressed and more prone to fracture when the boom breaks,and the greater the impulse released to the adjacent boom after the maximum stress of the short boom near the arch foot.The stability of the arch boom affects the stability of the arch bridge to a certain extent,but the impulse of the stable arch boom and the main arch boom at the corresponding position is smaller after the fracture,and it is not easy to cause chain failure.Finally,it is concluded that the bearing stress of the main arch boom is greater and more prone to failure,and it is necessary to focus on reinforcing the boom near the arch foot.

关 键 词：斜靠式拱桥 稳定性分析 有限元分析 吊杆损伤 

分 类 号：U448[建筑科学—桥梁与隧道工程]