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以宜宾长江大桥为工程背景,针对其H形桥塔采用底座天平进行了独塔状态下的测力试验,发展了基于塔底气动力推算塔柱断面气动力系数的近似方法,讨论了桥塔气动力的雷诺数效应及不同风向角情况下两塔柱间相互的气动干扰,桥塔气动力的测试结果将为该桥的抗风设计提供参数。结果表明,气动力系数整体随风速增大而略有减小,不同风向角情况下两塔柱间的气动干扰效应较为明显。
Taking the Yibin Yangtze River Bridge as the engineering background, a dynamometer under single-tower condition was tested for its H-shaped bridge tower. An approximate method of estimating the aerodynamic coefficient of the pylon section based on the aerodynamic force of the tower bottom was developed. The Reynolds number effect and aerodynamic interference between two towers under different wind direction angles, the test results of aerodynamics of the bridge tower will provide parameters for the wind-resistant design of the bridge. The results show that the overall aerodynamic coefficient decreases slightly with the increase of wind speed, and the aerodynamic interference effect between two towers under different wind direction angles is obvious.