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考虑强震作用下地震动参数的空间相关性,是生命线工程、道路、桥梁等呈空间分布的大型结构抗震设计的重点问题。由于强震观测历史和观测设备的限制,符合设计标准的地震波较为匮乏。因而,人工地震波成为结构抗震时程计算分析的一个重要技术。小波包技术将地震波进行时域和频域分解及合成并通过区域化的强震记录,得出小波包参数在时域和频域的统计特征及其空间相关性。进一步采用克里格插值法对无观测记录场址的地震动小波包参数进行最优估计,从而合成人工地震波。能较好地模拟人工地震波的区域空间相关特征,将为重大工程结构的防灾抗震仿真计算和动力优化设计提供实用可靠的地震波输入。
Considering the spatial correlation of ground motion parameters under the action of strong earthquakes, it is the key issue of aseismic design of large structures that are distributed in space such as lifeline engineering, roads and bridges. Due to the observation history of strong earthquakes and the limitations of observing equipment, seismic waves meeting the design criteria are scarce. As a result, artificial seismic waves become an important technique in the calculation and analysis of seismic time history of structures. Wavelet packet technique decomposes and synthesizes seismic waves in time and frequency domains, and obtains the statistical characteristics and spatial correlation of wavelet packet parameters in time domain and frequency domain through regional strong earthquake records. The Krieg interpolation method is further used to estimate the parameters of the ground motion wavelet packet at the non-observational record site to synthesize the artificial seismic wave. Can well simulate the regional spatial correlation characteristics of artificial seismic waves and provide practical and reliable seismic wave input for disaster prevention and seismic simulation and dynamic optimization of major engineering structures.