Influence of structural design parameters on seismic performance of shaped single-tower cable-stayed bridges

¹ Hefei Municipal Design Research Institute Co.,Ltd, Hefei 230041, China
² College of Civil Engineering, Hefei University of Technology, Hefei 230009, China
³ Anhui Feixiang Engineering Management Co.Ltd. Anhui, China
⁴ Anhui Gourgen Traffic Construction Co.Ltd. Anhui, China

^* Corresponding author: 2022170709@mail.hfut.edu.cn (Haihui Xie)

Abstract

The geometry and stress state of special-shaped cable-stayed bridges are complicated, so there is no uniform conclusion on their seismic performance and damage mechanisms under random seismic excitation. In light of this, taking a single cable plane curved inclined single tower cable-stayed bridge as the background, this paper establishes a spatial finite element model and conducts structural dynamic characteristics and seismic response analysis. Based on this, taking the bending radius and tilt angle as design parameters, the sensitivity analysis of structural seismic response to design parameters is carried out. The analysis results show that the first 5 vibration modes of the bridge are mainly the lateral vibration of the tower and girder, as well as the vertical vibration of the girder. Besides, the vibration modes are dispersed, and there is no phenomenon where a certain vibration mode dominates.The seismic response of the middle part of the tower is subjected to a large bending moment under the action of seismic force. Sensitivity analysis of structural design parameters indicates that the tower tilt angle and radius of curvature affect the bending moment more than the axial force, and the seismic performance of bridge decreases with the increase of tower tilt angle.