竖向地震对下承式钢箱拱桥拱肋截面荷载影响的建模分析

Modeling and Analysis of Influence of Vertical Earthquake on Load of Arch Ribs of Under-support Steel Box Arch Bridge

将汕头市濠江一桥作为研究样本,提出了基于有限元模型的竖向地震对下承式拱桥拱肋截面影响分析模型,首先对濠江一桥的地形地貌、水文气象、建设标准等信息进行概述,然后利用Midas/Civil软件构建濠江一桥模型,其次采用时程分析方法计算竖向地震中每一瞬时结构的位移、速度和加速度反应。通过实验结果可知,拱桥主拱肋与边拱肋截面荷载在考虑竖向地震动后均有很大的提高。通过实验最终完成了对竖向地震给下承式钢箱拱桥拱肋截面荷载造成影响分析。

Taking the Yongjiang Yiqiao Bridge in Shantou City as a research sample,the analysis model of the influence of vertical earthquake on the arch rib section of the lower arch bridge based on the finite element model is proposed.Firstly,the topography,hydrometeorology,construction standards and other information of the Minjiang River Bridge are summarized.The Minnes River/Civil software was used to construct the Minjiang River Bridge model,and the time history analysis method was used to calculate the displacement,velocity and acceleration responses of each transient structure in the vertical earthquake.The experimental results show that the cross-section loads of the main arch ribs and the side arch ribs of the arch bridge are greatly improved after considering the vertical ground motion.Through the experiment,the influence analysis of the vertical earthquake on the cross-section load of the arch rib of the steel box arch bridge is completed.