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现有的交通状况对细长大跨桥梁(SLB)面板主要影响有两类:1)桥梁横截面尺寸发生改变,这可能会反过来改变颤振导数及作用在桥梁上的风致气动弹性荷载;2)作用于桥梁上的附加动力荷载,包括来自于车辆的动力相互作用。与外部动力荷载——车辆相比,通过改变桥梁横截面尺寸来研究其影响是很少见的。在桥面板上分布车辆模型,在风洞实验室模拟随机交通流对按比例制作的桥梁截面模型进行试验。在风洞试验中通过改变桥梁的横截面尺寸来获得不同的颤振导数,目前的研究是从数值上评估其对大跨桥梁的风致性能,如气动弹性性能、风致响应和潜在疲劳累积性能的影响。
Existing traffic conditions have two main effects on slender, long-span SLB panels: 1) Changes in bridge cross-sectional dimensions that may in turn alter flutter derivatives and wind-induced aerodynamic elastic loads on the bridge; 2) Additional dynamic loads on the bridge, including the dynamic interaction from the vehicle. Compared with the external dynamic load-vehicle, it is very rare to study the influence by changing the cross-sectional dimensions of the bridge. The vehicle model is distributed on the bridge deck, and the random cross-flow model is simulated in the wind tunnel laboratory to test the proportionally made bridge section model. In wind tunnel tests, different flutter derivatives are obtained by changing the cross-sectional dimensions of a bridge. Current research is to numerically evaluate its wind-induced performance on long span bridges such as aeroelasticity, wind-induced response, and cumulative potential fatigue influences.