Vehicle Effect on Vortex-induced Vibration of Flat Steel Box Girder

Yang Yang,Zhang Liang Liang,Ling Xin,Wu Bo

doi:10.2174/1874149501610010012

Abstract

Vortex-induced vibration (VIV) occurs at low wind speed under normal condition, affected greatly by section type of bridge and its ancillary facilities. Few researches on VIV of vehicle-bridge system are conducted, and many researchers pointed that vehicle-bridge system should be paid attention to in wind tunnel test. In this paper, type of vehicle, number of vehicle and distance of traffic flow’s influence on VIV were studied with a flat steel box girder model. Results obtained from wind tunnel tests were displayed in order to prove the following rules: First of all, compared with conditions without vehicles, response of VIV is reduced severely when a vehicle is placed on the bridge. Secondly, response of VIV and range of VIV with three vehicles are greater than one vehicle on the bridge. At last, VIV is reduced when distance of traffic flow increases. Mechanism from fluid dynamic point view is given by simulating the working conditions with ANSYS 14.5.

Highlights

Vortex-induced vibration (VIV) occurs at low wind speed under normal condition, affected greatly by the section types of bridge and its ancillary facilities
Wind tunnel test is a major approach in studying VIV, many researchers studied the factors effecting the VIV by wind tunnel test, such as railings, guide plate, maintenance guide, spring damping ratio, wind fairing, suppression vibration plate on deck, surface roughness, wind and rain occurs at the same time on the bridge [1 - 7]
Effects of different traffic flow and different wind attack angles were significant in aerodynamic characteristic of bridge, and vehicle-bridge system should be concerned in wind tunnel test

Summary

INTRODUCTION

VIV occurs at low wind speed under normal condition, affected greatly by the section types of bridge and its ancillary facilities. Li [10] took a wind tunnel test with eight kinds of discrete double-box girders, getting a conclusion that vehicle location on the bridge and aerodynamic characteristic of bridge can affect the vehicle-bridge system’s Reynolds number. Effects of different traffic flow and different wind attack angles were significant in aerodynamic characteristic of bridge, and vehicle-bridge system should be concerned in wind tunnel test. F. Dorigatti [12] studied the ideal and typical bridge deck’s aerodynamic characteristic when there was a traffic flow with cross wind speed higher than 10 m/s. This paper mainly studied on types of vehicles, number of vehicle and distance of traffic flow’s influence on VIV

BACKGROUND

Section Model

Parameters

Working Conditions

Findings

CONCLUSION