（北京首钢设计院  100043）
【提要】  某钢铁厂炼铁系统中喷煤主厂房的二期工程受现场条件及工艺布置要求的限制，结构平、立面布置及各层平台的设备荷载分布均存在较大的不规则性。基于不同方案的对比分析，采用中心支撑钢框架结构方案。用Pushover分析方法对拟定方案在罕遇地震作用下的抗震性能进行了补充验算，校核了方案的合理程度，并针对薄弱部位采取了相应的加强措施。
【关键词】  中心支撑钢框架结构  不规则性  方案优化  推覆分析  合理性
Design of Steel Braced Frame Structure/Zhang Fuke，Ning Zhigang，Jiang Xiaorong（Beijing Shougang Design Institute，Beijing 100043，China）
Abstract:Considering field condition and processing setup，irregularity of the secondstage PCIsystem main structure and load distribution of equipments are severe. The project is determined based on the comparison of different models. Pushover analysis of the model is performed，the reasonability is validated and reinforced construction measures are taken for weak position of the structure.
Keywords:steel braced frame structure；irregularity；project optimize；Pushover analysis；reasonability