MECHANICAL CHARACTERISTIC AND SLIP BEHAVIOR OF MAIN CABLE OF LONG-SPAN SUSPENSION BRIDGE

Summary

Mechanical characteristics and strand slip behaviors of main cable of the long-span suspension bridge are presented in the present study. Theoretical models of static wind loads of different components of the bridge, and the kinematic model of wind-vehicle-bridge system are presented. The finite element model of long-span suspension bridge was established employing the finite element software ANSYS. The static axial stress characteristics and static wind stability of main cable were explored. Effects of wind speed and vehicle speed on the dynamic characteristics of main cable were investigated. The self-made slip test rig between cable strand and saddle was employed to investigate the influence of the number of cable strands on the slip characteristics of main cable strands. The results show that the maximum axial stress of main cable located at the middle tower increases with increasing sag ratio. The static wind stability of main cable is greatly affected by wind speed and wind attack angle. According to dynamic characteristics of main cable, the maximum axial stress located at the midspan of main cable increase with increasing wind speed and vehicle speed.

Keywords: Long-span suspension bridge; main cable; mechanical characteristics; strand slip behaviors

Author(s): D.Wang, B.Wang, H. Zhu