370m跨径X形提篮拱结构有限元模拟研究

Research on structural FEM of 370 m large span x-type arch bridge

渝黔铁路是国家"八纵八横铁路网"中"包柳铁路大通道"的重要组成部分。以渝黔铁路线中X形提篮拱桥为依托工程,为确保施工工程质量与安全,采用Midas/Civil2010有限元软件对该拱桥成桥后主拱圈应力、运营阶段稳定性与位移验算等进行了计算和分析,结果表明该提篮拱桥拱脚处最大压应力为14 MPa满足混凝土规范要求设计值,结构运营阶段稳定系数为32.2,满足现行规范限值,结构在横纵向自振周期分别为1.473 s与1.389 s均满足规范限值。

Yu-Qian Railroad is an important part of Baotou-Liuzhou Railway in the railway main lines. In order to ensure the quality and safety of the x-type arch bridge which is going to be built in Yu-Qian Railroad. The calculation and analysis are made of the stress of the main arch ring, the stability of the operation phase and the displacement by Midas/Civil2010 FEM software. The results indicate that the maximum stress of arch springing is 14 Mpa which can meet code requirements. K is 32.2 which can meet the present code in the operational stage. The natural vibration period of transverse and longitudinal directions are 1. 473 s and 1. 389 s which can meet code requirements.