某电厂主厂房与汽机平台联合结构抗震性能数值分析

Seismic perfbrmance of a power plant building withjointly configured turbine foundation

传统设计中,火力发电厂主厂房一直采用汽轮机发电机组及其支座立柱与主厂房结构相互独立的设计方案.目前国内提出一种新型汽机基础布置方案,将汽机基础通过弹簧直接高位置于主厂房结构上,与主厂房组成联合结构.为研究这种新型结构布置方案的可行性,本文以土耳其9度区某火电厂钢框排架主厂房和汽机平台为原型,采用ABAQUS有限元软件建模,并进行了模态分析、反应谱分析以及罕遇地震下弹塑性时程分析.分析结果表明,主厂房与汽机基础联合结构位移、层间位移角等指标均能满足抗震规范要求,且能保证罕遇地震下结构不发生倒塌.本文研究可对相关结构设计提供依据及参考.

In the traditional design,the steam turbine-generator set and the main structure of the plant are independent each other in main power plant.At present,a new type of turbine foundation layout scheme has been put forward in China.The turbine foundation is put on the main powerhouse structure through the spring;and the main structure is combined with the main power plant.For the feasibility study of this new structure layout,modal analysis,response spectrum analysis and severe earthquake elastoplastic time history analysis are performed with ABAQUS finite element software taking aproject of thermal power plant of steel frame bent main plant and turbine platform in Turkey District of seismic intensity 9as the prototype.The analysis results show that the displacement,maximum displacement angle can meet the seismic requirements and can guarantee the structure under severe earthquake does not collapse.This study results can provide a basis and reference for the design of related structures.