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文中研究了北京及其周围地区的历史地震和地震地质资料,并在此基础上估计了基岩运动的参数。众所周知,局部地质、地形和土质条件等许多因素对给定场地的地面运动特性都是有影响的。本文着重考虑了土层的特性对地面运动的影响.作为分析工作的基础,我们研究了北京地区典型土层的动力特性。为了分析市区各场地上的地震反应,我们将它分成面积大体相等的许多网格,对于每一网格都分析了相应土层柱状在指定输入运动下的地震反应,通过电子计算和绘图装置将结果用许多图件表示,从而给出了不同场地上地震反应谱和强震地面运动的地区分布。这些图件可用来作为制定土地利用和防震规划的参考。我们根据市区每一地点的计算反应谱和典型结构的平均周期确定了相应结构的地震系数,结果已绘成等值线,这些图件可作为典型结构的震害预测和抗震设计的参考。
In this paper, the historical and seismic geological data of Beijing and its surroundings are studied, and on this basis, the parameters of bedrock movement are estimated. It is well known that many factors such as local geology, topography and soil conditions have an impact on the ground motion characteristics of a given site. This paper focuses on the influence of soil properties on ground motion, and as a basis for the analysis, we study the dynamic characteristics of typical soil layers in Beijing. In order to analyze the seismic response of the urban area, we divide it into many grids of roughly equal area. For each grid, the seismic response of the corresponding columnar column under the specified input motion is analyzed. Through the electronic calculation and plotting device The result is represented by many plots, which gives the regional distribution of seismic response spectrum and ground motion of strong earthquakes on different sites. These maps can be used as a reference for planning land-use and earthquake-proofing plans. We have determined the seismic coefficients of the corresponding structures based on the calculated response spectrum and the average period of the typical structure at each site in the urban area. The results have been plotted as contours. These maps can serve as a reference for seismic damage prediction and seismic design of typical structures.