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Mechanism study of vehicle-bridge dynamic interaction under earthquake ground motion

机译：地震地面运动下车辆桥动态相互作用的机制研究

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摘要

With increasing traffic congestion happening across the world nowadays in the busy highway bridge systems and urban areas, seismic interaction between vehicle and bridge is a subject that has attracted increasing research interests. A few studies were conducted in recent years. There seems to be a cursory consensus that the behavior of vehicle is similar to a tuned-mass-damper and usually results in beneficial effect to bridge seismic responses. However, the mechanism of seismic interaction between vehicle and bridge still remains unclear. Present study statistically investigates the seismic responses of both vehicle and bridge under real earthquakes and a reasonable explanation as to the interaction mechanism between vehicle and bridge is given based on energy analysis. The results show that dynamic interaction would affect the energy distribution between vehicle and bridge. Vehicle has little influence on seismic responses of bridge in the horizontal directions because of the change of energy imparted to bridge caused by vehicle is very small. On the contrary, vehicle responses in the horizontal directions, under some circumstances, are extremely large as a result of relatively large energy imparted from bridge to vehicle. In the vertical direction, a surge of energy imparted to bridge, at some instant of time, caused by vertical compression force between vehicle and bridge could result in significant increases in peak responses of bridge. However, the total input energy imparted to bridge over the duration of earthquake is reduced lessening the overall damage of bridge.
机译：随着现在在繁忙的公路桥梁系统和城市地区的世界上发生的交通拥堵，车辆与桥梁之间的地震互动是吸引了越来越多的研究兴趣的主题。近年来进行了一些研究。似乎有一个奇迹共识，即车辆的行为类似于调谐质量阻尼器，通常导致桥接地震反应的有益效果。然而，车辆与桥梁之间的地震相互作用的机制仍然尚不清楚。目前的研究统计研究现实地震下车辆和桥梁的地震反应，基于能量分析给出了车辆和桥梁之间​​的相互作用机制的合理解释。结果表明，动态相互作用会影响车辆和桥梁之间​​的能量分配。由于施加由车辆引起的桥梁的能量变化，车辆对水平方向上的桥梁的地震反应影响很小。相反，在某些情况下，在水平方向上的车辆响应，由于从桥到车辆施加的相对较大的能量而非常大。在垂直方向上，由车辆和桥梁之间​​的垂直压缩力引起的施加桥梁的能量涌动可能导致桥梁的峰值响应显着增加。然而，在地震持续时间内施加到桥梁的总输入能量减少了桥梁的整体损坏。

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