Numerical Simulation Study On Aerostatic Coefficients Of Representative Sections Of Bridge

Static wind load is one of the design loads of the long-span bridge and the aerodynamic force coefficients at different attack angles are the essential parameters in the study of Flutter and buffeting. Therefore, On design stage, it is very important to predict the wind loads of the components of the bridge accurately. At present, the method which is usually used is to make a segment model with some reduced scale and determines the aerodynamic force coefficients in the wind tunnel test, then get the static loads through corresponding formulas. However, it usually takes much longer time with more spending and more complex equipments.In recent years, the development of computational fluid dynamic gives us a possible approach to replace the wind tunnel test. Comparing with the traditional wind tunnel test, numerical simulation technology has many advantages, such as money and time-saving, flexibility, free from physical and experimental model's restrictions etc. The prominent feature of the numerical simulation technology is the realization of the flow visualization. It can show us the flow characteristics under each circumstance intuitively.In this paper, the author studies the aerodynamic force coefficients of the typical cross-sections in bridge engineering by numerical simulation technology. The work is divided into the several aspects as follows:(1) Studies the drag coefficient of the circular section at different Reynolds number and studies the influence to the drag and lift coefficients of circular cross-section caused by vortex shedding. The related characteristic graphs of the flow are also given in the paper.(2) Studies the drag coefficient of square cross-section at different ratios of length and height at 0°attack angle. The related characteristic graphs of the flow are also given in the paper.(3) Studies the deck's aerodynamic force coefficients of Sutong bridge and Jinma bridge at different attack angles and verifies the feasibility and reliability of numerical simulation in the study on the deck's aerodynamic force coefficients by comparing the results of the numerical simulation and the wind tunnel test. (4) Studies the influence to the aerodynamic force coefficients of streamline cross-sections by the shape of the wind nose at 0°attack angle. The related characteristic graphs of the flow are also given in the paper.(5) Studies the deck's aerodynamic force coefficients of a double decks bridge at different attack angles and verifies the aerodynamic interference between two decks by comparing the results of the double decks bridge and the single deck bridge. The related characteristic graphs of the flow are also given in the paper.