MODELING OF HANDRAILS BY POROUS MEDIA IN EVALUATING VORTEX-INDUCED VIBRATION AMPLITUDE OF BRIDGE USING LES

Abstract

The effects of detail sections such as handrails on the vibration response of bridges have not been sufficiently clarified. In addition, accurately modeling the detail section of the handrail members in CFD requires a large computational cost. In this study, handrails modeled partially with porous media were installed on a box girder cross-section, and the aerodynamic force coefficients and flutter derivatives obtained from sinusoidal forced vibration were calculated using LES. Based on the obtained flutter derivatives, the steady-state vortex-induced vibration (VIV) amplitude in the vertical one-degree-of-freedom for each reduce wind speed was obtained by calculating the amplitude where the structural damping and negative aerodynamic damping were balanced. The obtained VIV amplitude is good agreement with the results of spring-supported free vibration wind tunnel tests.