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提出了工程场地地震动随机场的物理模型,并利用实测地震动验证了其正确性.首先,阐释了工程场地地震动场双尺度建模的基本思路;其次,以地震点源模型和均匀各向同性传播介质模型为基础,阐明基岩表面地震波场具有二维球面波场形式,并给出了基岩表面地震波场一般形式;假设工程场地内的地震波为平面波,建立场地滤波模型,获得了工程场地表面地震动场的基本表达式;再次,引入震源、传播途径和局部工程场地的具体物理模型并考虑基本物理参量的随机性,建立了工程场地地震动随机场的物理模型.利用波群叠加方法,对SMART-1台站组记录的强震地震动时程数据进行了样本层面的建模.研究结果表明,本文所发展的地震动随机场物理模型能够反映真实地震动的空间相关性.
The physical model of earthquake ground motion field of engineering site is put forward and its correctness is verified by the measured ground motion.Firstly, the basic idea of two-scale modeling of ground motion field of engineering site is explained.Secondly, Based on the model of the same-sex propagation medium, it is illustrated that the seismic wave field on the bedrock has a two-dimensional spherical wave field and the general form of the seismic wave field on the surface of the bedrock. Assuming that the seismic wave in the construction site is a plane wave, The basic expression of ground motion field of engineering site is introduced. Thirdly, the physical model of ground motion random field of engineering site is built by introducing the physical model of source, route and local engineering site and considering the randomness of basic physical parameters. Superposition method was used to sample the strong ground motion time history data recorded by SMART-1 station group.The results show that the physical model of ground motion random field developed in this paper can reflect the spatial correlation of real ground motion .