双幅桥面桥梁三分力系数气动干扰效应试验研究

Experimental Study of Aerodynamic Interference Effects on Aerostatic Coefficients of Twin Decks Bridges

针对大跨度双幅桥面桥梁三分力系数的气动干扰问题,采用风洞试验方法对某在建大跨度双幅桥面桥梁的气动干扰效应进行研究.分别改变双幅桥面间距、风攻角参数来研究其对双幅桥面三分力系数气动干扰效应的影响.研究显示,双幅桥面桥梁三分力系数的气动干扰效应主要表现为:下游桥面阻力系数的降低,上游桥面桥梁阻力系数与单幅桥面相比略有降低;上、下游桥面的升力系数和升力矩系数也存在一定的气动干扰效应,但相对而言影响较小,其影响可以忽略.

The aerodynamic interference effects on aerostatic coefficients of twin deck bridges with large span were investigated in details by means of wind tunnel test. The distances between the twin decks and wind attack angles were changed during the wind tunnel test to study the effects on aerodynamic interferences of aerostatic coefficients of twin decks. The research results have shown that the drag coefficients of the leeward deck are much smaller than that of single deck. The drag coefficients of windward deck decrease slightly compared with that of single deck. The lift and torque coefficients of windward and leeward deck are also affected slightly by the aerodynamic interference of twin decks. And the aerodynamic interference effects on lift and torque coefficients of twin decks can be neglected.