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一、引言我国较早的抗震规范采用地震反应谱做为设计依据当推1964年《地震区建筑设计规范》(草案)。当时中国科学院工程力学研究所刘恢先教授和周锡元、陈达生等同志基于苏联麦德维杰夫对场地的地震影响采用烈度调整的方法,并在豪斯纳和麦德维杰夫提出平均反应谱概念的基础上,利用场地划分以反映不同场地上频谱特征的差异。1974年在制定《工业与民用建筑抗震设计规范》(试行)时,陈达生等依据我国、美国及日本等国的强震资料,对抗震设计反应谱特征做了深入的研究分析,建议将场地划分为三类,并给出相应的标准反应谱,这一成果为规范(TJ11-74)所采用。1974年以来,国内外强震观测有了很大的发展,中国科学院工程力学研究所等单位在海城、唐山、松潘和龙陵等地震时取得了大量强余震和主震记录。其中1976年松潘地
I. INTRODUCTION The earliest seismic codes in China adopted the seismic response spectrum as the design basis, and the “Code for the Design of Architectural Designs in Earthquake Zones” (Draft) was promoted in 1964. At that time, Prof. Liu Huixian, Zhou Xiyuan, and Chen Dasheng of the Institute of Engineering Mechanics, Chinese Academy of Sciences adopted the method of intensity adjustment based on the earthquake effect of the Soviet Medvedev on the site, and proposed the concept of average response spectrum in Hausner and Medvedev. On the basis of the use of site division to reflect the differences in spectral characteristics of different sites. In formulating the “Code for Seismic Design of Industrial and Civil Buildings” (Trial) in 1974, Chen Dasheng et al. conducted in-depth research and analysis on the characteristics of anti-seismic design response spectra based on strong earthquake data from China, the United States, Japan, and other countries. For the three categories, and give the corresponding standard response spectrum, this result is used by the specification (TJ11-74). Since 1974, there have been great developments in strong earthquake observations at home and abroad. The Institute of Engineering Mechanics, Chinese Academy of Sciences and other units have obtained a large number of strong aftershocks and mainshock records during the earthquakes in Haicheng, Tangshan, Songpan, and Longling. Among them, Songpandi in 1976