ANALYSIS OF TIME-DEPENDENT CHARACTERISTICS FOR CABLE STATE OF EXISTING CABLE-STAYED BRIDGE
In view of the fact that steel cables of cable-stayed bridge are susceptible to corrosion and tend to become stress relaxation during service life, it is essential to take those time-dependent characteristics into account in structural analysis to ensure the safety of the existing bridges. However, most of the recent methods are given under the cable material in perfect state and cable effects of time-dependent characteristics associated with cable corrosion and stress relaxation are neglected, which makes the application of the current methods difficult in dealing with in-service cable structures. By introducing equivalent-strain principle and geometrical damage theory, the corrosion mechanism of cable is described. A UL formulation for cable state of existing cable-stayed bridge is presented by solving the boundary problem with the governing differential equation of the inservice cable. With the proposed method, cable corrosion as well as stress relaxation has been taken into consideration, which leads to good precision and provides a new approach to assess the safety of cables in cable-stayed bridges, and it could be applied in structural health monitoring of long-span cable-stayed bridges.
cable-stayed bridge cable characteristics corrosion stress
Juan Huang Li-Qun Tang
State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzho School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 5106
国际会议
广州
英文
1122-1127
2009-11-28（万方平台首次上网日期，不代表论文的发表时间）