论文部分内容阅读
为了考虑实际运营车辆对桥梁气动导数的影响,根据车辆密度模拟了三种交通流状态,基于强迫振动装置,分别对每个交通流和无车状态下的桥梁气动导数进行风洞试验研究,讨论了不同攻角下不同车流的车辆对桥梁气动导数的影响,探究了车辆对气动导数影响的百分比以及气动导数变化量的变化规律。研究结果表明:不同攻角下不同车流的车辆均对直接导数A*2、H*4和交叉导数A*4、H*2影响显著,A*2、A*3变化量随着折减风速有一定的变化规律。虽然不同攻角下不同车流的车辆对气动导数的影响程度及影响规律不同,并且车流的繁忙程度对大多数气动导数的影响规律不明显,但是车辆对桥梁气动导数的影响不容忽略。
In order to consider the influence of the actual operation vehicle on the aerodynamic derivatives of the bridge, three traffic flow states are simulated according to the vehicle density. Based on the forced vibration device, the wind tunnel test of the bridge aerodynamic derivatives in each traffic flow and car-free state is carried out respectively. The influence of vehicles with different traffic flow on the aerodynamic derivatives of bridges under different angles of attack is explored. The variation of the aerodynamic derivative and the percentage change of aerodynamic derivatives are investigated. The results show that vehicles with different traffic flow at different angles of attack have significant effects on direct derivatives A * 2, H * 4 and cross derivatives A * 4, H * 2. As the A * 2, A * There are certain changes in the law. Although the influence degree and influence laws of aerodynamic derivatives with different traffic flow at different angles of attack are different, and the influence of traffic intensity on most of the aerodynamic derivatives is not obvious, the influence of vehicles on aerodynamic derivatives of bridges can not be neglected.