基于Pushover方法框排架主厂房地震失效模式研究

Pushover-based study on seismic failure modes of frame-bent structural main factory building

鉴于大型火力发电厂框排架主厂房结构质量和刚度分布严重不均匀,传力路径复杂,抗震性能差,研究了其地震失效模式,对结构局部优化,以提高其抗震性能。基于Pushover分析方法,对钢筋混凝土框排架主厂房结构进行了研究。结果表明:在7度罕遇和8度罕遇地震下,结构的层间位移角均未超过现行规范规定的混凝土框架结构的层间位移角限值;结构的薄弱层出现在排架间大平台与运转层和煤斗层与除氧器层,失效模式均为梁柱铰混合模式,其中排架间大平台与运转层破坏严重。

Considering frame-bent structural main factory building of large-scale thermal power plants whose structural quality and rigidity are distributed non-uniformly,the load transfer route is complex and the seismic performance is poor. This paper studies the building＇s seismic failure modes and locally optimizes its structure to improve its seismic performance. Based on pushover method,the paper researches the structure of RC frame-bent main factory building. The results show that under action of seldom occurred earthquake of Intensity 7 and Inlensity 8 the interstory drift angles are not more than corresponding limit values of drift angle specified in current code. The weak storey of the structure are the large platform and the operation floor between the bents,the scuttle floor and the deaerator floor. The failure modes are all beam-column hinging mode,the large platform and the operation floor between the bents are severely damaged.