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(一) 前言本文介绍的厂房是现正施工预计今年中期竣工的天碱碳化工段厂房,主体结构是刚度和强度在竖向分布极不均匀的现浇钢筋混凝土纯框架。从理论分析结合震害显示,这类框架往往出现局部地震反应突出,局部变形过大而形成抗震的薄弱环节。针对这一情况,本工程的抗震设计在遵照现行抗震规范进行常规计算和构造之后,再进行地震的弹塑性时程反应分析,在理论分析的基础上,对十四项延性构造的要求和指标(见《化工厂延性框架动态设计及其工程应用》)进行校验,以时程反应分析和延性构造校验作为常规抗震设计的补充,即所谓抗震的二次设
(I) Introduction The plant introduced in this article is the Tiancao Carbon chemical plant building that is currently under construction and is expected to be completed in the middle of this year. The main structure is a purely in-situ reinforced concrete frame with very uneven stiffness and strength. From the theoretical analysis combined with the seismic damage display, these types of frameworks often have prominent local seismic response, and the local deformation is too large to form the weak link of earthquake resistance. In response to this situation, the seismic design of this project follows routine seismic calculation and construction, and then conducts an elasto-plastic time-history response analysis of the earthquake. Based on the theoretical analysis, the requirements and indicators of the 14 ductile structures are based on the theoretical analysis. (See “Dynamic Design and Engineering Application of the Ductility Framework of Chemical Plants”) for verification. Time-history analysis and ductile structural verification are used as a supplement to conventional seismic design, that is, the so-called secondary design of seismic resistance.