前言大多数桥梁结构的地震分析是假定桥梁各支承点的地面运动是一致的。但是,这个假定仅仅是近似的,因为它没有考虑入射地震波由于不同原因而引起的空间变化,例如地震机制、地震波的传播特征、地形、地质等等。虽然在一定范围内地震波的传播型式几乎是不可预测的,但是地震仪台网的记 Introduction The seismic analysis of most bridge structures is based on the assumption that the ground motions of the various supporting points of the bridge are consistent. However, this assumption is only approximate because it does not take into account the spatial variations of incident seismic waves due to different reasons, such as the earthquake mechanism, the propagation characteristics of seismic waves, terrain, geology, and so on. Although the propagation pattern of seismic waves within a certain range is almost unpredictable, the seismograph network records