公路高架桥交通引起的地面振动：分析和验证

Ground vibrations induced by heavy traffic on a highway viaduct:analysis and validation

针对普通公路高架桥引起的地面振动问题提出了一种预测地面响应的有效方法。该方法假设高架桥的桥墩在交通荷载下是刚体运动,根据实测数据求得基础承台的输入荷载,并进而由一个准三维有限元方法所得基础承台中心的阻抗函数以及地面响应的传递函数,可以预测周围地面的响应。无论是试验车的情况还是通常的繁忙交通工况,计算的结果和地面响应的实测数据符合得很好。这证明了该方法的可靠性以及对高架桥交通引起的地面振动的通用性。

An effective method was proposed to predict the ground responses in the near field due to traffic on a highway viaduct. The basic assumption was that a pier of the viaduct was supposed to move as a rigid body, so that the motion at the footing center could be derived from the measured data at the pier. A pseudo-3-dimmentional FEM procedure was utilized to derive the impedance function at the footing center and the transfer functions at specified points in the near field. Further more, the ground responses were predicted and validated by the measured records. Good consistency was achieved for the cases of a test-run truck as well as ordinary traffic. Therefore, the present method was reliable and could be widely applied for viaduct traffic.