关于上海市《建筑抗震设计规程》中长周期设计反应谱的讨论

Discussion on the long-period design spectrum in "Aseismic Design Code for Buildings" of Shanghai

在上海市地方标准《建筑抗震设计规程》（DBJ08-9-92）及其1996年局部修订增补版本中，对上海市Ⅳ类场地建筑结构的地震影响系数进行了特殊规定，并将结构自振周期延长到10s，同时给出了三条加速度时程用于时程分析．本文主要针对《建筑抗震设计规程》中有关长周期反应谱部分的规定，根据国内外的研究现状，进行一些探讨，指出所提供的一条人造地震动时程和两条国外加速度记录用于上海市Ⅳ类场地长周期建筑结构的时程分析可能并不合适；文中并提出了一些改进的建议．

In Shanghai local standard 'Aseismic design code for buildings' (DBJ08 -9-92) and the partial revision and addition in 1996, the seismic coeffcient is specially stipulated for the design of buildings on the site category Ⅳ and the natural period is elongated to 10s. Three acceleration time .histories are provided for the time-history response analysis in the code. In this paper we mainly conunnt on the long-period design spectrum in 'Aseismic design code for buildings' from the research proceedings both in China and in the world. We indicate that the use of two American accelerograrns for time-history response analysis for large-period building may be unsuitable. Some suggestions are also put forward for improvement.