Study on Three-Dimensional Earthquake Response Analysis of Structural System on Integrated Consideration of Source, Wave Propagation Path, Local Site Effects, and Structure

综合考虑震源、波传播路径、局部场地效应和结构等因素设计结构体系是合理的。本研究旨在建立基于波传播理论和震源动力学的地震动模型，用于地震设计。在这种建模中，需要给出能够基本描述波在断层表面从震源到场地的传播和震源过程的物理规律。针对这一问题，通过对点源入射波运动不规则的三维冲积层地震响应的研究，阐明了与地表和地下土层的地质性质和地形条件有关的场地放大特征。断层破裂过程的源模型用简单函数表示。根据上述建模中的物理规律，采用土壤地面从源到场地的格林函数和简单源函数来表示地震动模型。通过地震动模型关键参数的变化，给出了波形函数的基本构成和波谱特征，以及地震波的场地放大特征。通过对千叶县东海岸地震（1987年）和兵古县南部地震（1995年）地面运动的预报后试验，验证了该模型的有效性。预测试验表明，该模型与实测地震的波形函数和反应谱吻合较好。基于波传播理论和震源动力学的相应地震动模型将为结构体系更合理的抗震设计提供有用的信息和数据。

It is reasonable to design a structural system on an integrated consideration of source, wave propagation path, local site effects, and structure. This study intends to present the ground motion model based on wave propagation theory and source dynamics for seismic design. In this modeling, it needs to present the physical laws which can describe essentially wave propagation from source to site and source process on the fault surface. In relation to this problem, the site amplification characteristics related to the geological properties and topographical conditions of surface and subsurface soil layrs are clarified through the study of seismic response of three-dimensional alluvial deposit with irregularities for incident wave motion from a point source. The source model for the rupture process on the fault surface is expressed by the simple function. According to the above physical laws in modeling, the ground motion model is presented by the Green's function of the soil ground from source to site and the simple source function. The basic formation of wave form function and spectral characteristics, and the site amplification characteristics of wave motions have been presented through the variation of the key parameters of the ground motion model.The effectiveness of this model is verified through the post prediction test against the ground motions of the Off East Coast of Chibaken Prefecture Earthquake (1987) and Hyogo-ken Nanbu Earthquake (1995) . The prediction tests show that the ground motion model agrees well in the wave form functions and response spectra of observed earthquakes. The pertinent ground motion model based on wave propagation theory and source dynamics would present useful information and data for more reasonable seismic design of a structural system.