Geometric Nonlinear Analysis of Cable Stayed Bridge Based on the Effect of Stay Cable Sag 

Jinzhou XIN

School of Civil Engineering & Architecture, Chongqing Jiaotong University, Chongqing 400074, CHINA

Abstract: Based on the background of Chongqing Rail Transit Line 6 CaiJia Jialing River Bridge engineering, aiming at higher complexity of statically indeterminate structure for rail cable-stayed bridge, this paper details of the cable-stayed bridge nonlinear problems, and discuss the cable-stayed bridge iterative method of nonlinear analysis; Finally, according to the two models of a linear and only-considering part of the cable sag effect of geometric nonlinearity, we focus on the cable sag effect and calculate the response phase into the bridge structure. The results show that : the track cable-stayed structure under constant loads showed significant nonlinear, it is essential to consider the effect of geometric nonlinearity in the structural analysis and design.

Keywords: Nonlinear; Cable Stayed Bridge; Stay Cable Sag