The Study Of The Influence Factors On Typical Cross-section Of Segmental Model Wind Tunnel Test

Wind effecting on Bridges structure, not only can form the wind load on structure, canalso lead to various forms of bridge vibration.Therefore, it is necessary to research the bridgewind engineering. So far, the wind tunnel test is the most widely used in the bridge windengineering research methods.As the most widely used of the wind tunnel test, the result ofsegmental model test are affected by many factors.Based on two types of cross-sectionincluding bluff body section andStreamlined section,this paper research the influence of aspect ratio and end plates on windtunnel test results,the variation of the static aerodynamic coefficient and the wind pressurecoefficient along the length direction.Changing the model length with big end plate3.0metres wide wich as high as the windtunnel to get five different aspect ratio:4:1、3:1、2:1、1:1、0.5:1. Compared the staticaerodynamic coefficient and the wind pressure coefficient to research the effect of the aspectratio on wind tunnel test.There are four different end plates，The height ratios of end plates height and the modelare shown as followns:3:1、5:1、7:1、50:1；The width ratios are shown as followns:1.4:1、1.8:1、2.2:1、5.45:1, Compared the static aerodynamic coefficient and the wind pressurecoefficient to research the effect of the end plates on wind tunnel test.The model is divided into20equal parts along the longitudinal direction. Since themodel symmetry, dividing the half of the model into10equal parts to research the variation ofthe static aerodynamic coefficient and the wind pressure coefficient along the length direction.