王亚勇
    （中国建筑科学研究院工程抗震研究所 北京 100013）

[提要]  对现行《建筑抗震设计规范~(GBJ11 - 89)的主要特点和存在问题作了评论，提出了编制我国2000年抗震设计模式规范的初步设想和若干重要研究课题：对地震危险方面的研究，实现由烈度向地震动参数区划的过渡，按重现期或超越概率重新定义地震危险水平；提出以结构性能为基础的抗震设防标准，定义不同结构的性能目标；对现行抗震设计反应谱的缺点加以改进，考虑长周期谱成分和近场强震效应，采用能量谱和位移谱、损伤谱等；将能量方法实用化，引进地震动持时等；对结构抗震计算方法加以改进；以结构位移或构件及节点的应变为主要参数，建立结构损坏和倒塌的标准等等。
[关键调]  抗震设计 模式规范 性能设计

Some comments are made on the present "Seismic Design Code for Buildings GBJ l l- 89". The latest achievements and focuses in the seismic design code development in the world are introduced. It is suggested that the following subjects be required to carry out for the model code of year 2000 for the seismic design of buildings:the earthquake risk assessment realized by replacing the seismic intensity by the seismic zoning parameters, and by determining the risk levels by return periods or exceeding probabilities; the earthquake design level and the earthquake performance level for varied structures; the improvement of the current seismic design spectra involving the long period components and the near field effect of strong motion; the practical use of energy spectrum, displacement spectrum as well as the accumulated damage spectrum; the methodology of seismic analysis of structures; the displacement-based or sequence-based criteria of structural damage and collapse, etc. The model code of year 2000 for buildings would be a guideline of seimic design codes for varied engineering objects.
Keywords: seismic  design; model  code; performance; risk  levels; return  period; spectra; zoning  parameter