双幅桥面行车风环境的数值模拟及其改善措施

Numerical Simulation & Improvement Measures to Driving Wind Environment of Twin Decks

以全长12.45 km的某跨海大桥为例,介绍双幅桥面桥梁行车风环境的评价方法。通过风洞试验和计算流体动力学(CFD),研究该海湾大桥主桥双幅桥面上一定高度范围内风速分布,并计算各车道等效相对风速。通过比较CFD和风洞试验结果,验证二维CFD数值计算用于模拟双幅桥面行车风环境的可靠性。通过方案比选提出改善双幅桥面行车风环境的风障措施。研究结果表明,二维CFD数值计算可较准确模拟双幅桥梁桥面的行车风环境。

Taking a certain length of 12.45 km as an example,this paper introduces the method of evaluating the wind environment of the doubledeck bridge. Through the wind tunnel test and computational fluid dynamics(CFD),the wind speed distribution on the double bridge deck of the main span of Bay Bridge is studied and the equivalent wind speed of each lane is calculated. By comparing the results of CFD and wind tunnel tests,it is verified that the two-dimensional CFD numerical simulation is used to simulate the reliability of the wind environment of the double deck bridge. The measures to improve the wind environment of the double-decked bridge deck were proposed by comparing the alternatives. The results show that the two-dimensional CFD numerical simulation can accurately simulate the driving wind environment of the double deck bridge decks. When the wind environment of the bridge deck is bad,the wind barrier on the bridge deck can effectively improve the traffic wind environment of the bridge deck and to ensure the traffic safety.