The effect of cable roughness and diameter in investigating the behavior of cable-stayed bridges under the rain-wind induces vibration (RWIV)

Abstract

A fluid structure instability phenomenon frequently occurs in the subcritical Reynolds regimes 9 multiphase flow system, and rain–wind-induced vibration(RWIV) is taken as an example in civil engineering to characterize the aeroelastic instability caused by fluid-structure interactions.In this study, the basic concepts of cable dynamics are first examined to better understand the vibrations caused by wind and rain. Vibration caused by wind is mainly related to the impact of wind turbulence, vibration caused by eddy. Then the possible mechanism of rain-wind induces vibration (RWIV) is investigated and a simple analytical model for RWIV is presented. Cable dynamics analytical model is used to estimate RWIV for cable. One of the methods to reduce the effects of wind and rain on bridge cables is the aerodynamic characteristics of the cable and one of the aerodynamic aspects of the cable is related to the surface roughness and diameter of the cable. Then, according to the subject under study in the research, effective forces and parameters, specifications of dimensions and computational space and prevailing boundary conditions are introduced and numerical tests are presented to investigate the effect of cable roughness and diameter.