火电厂钢支撑-框排架结构动力模型设计及试验

Design and Test of Dynamic Model of Steel Braced Frame-bent Structure in Thermal Power Plant

为解决钢支撑-钢框排架结构模型计算与试验对比的问题,对该结构体系的动力特性和地震反应进行研究,以某大型电力主厂房结构设计和PKPM计算模型为背景,使用SAP2000软件建立原型结构有限元模型。针对这类具有复杂质量和刚度分布特点的结构体系,提出满足结构动力特性一致性要求的振动台试验物理模型设计原则和相关技术措施,完成缩尺结构模型的构造设计、同条件有限元建模分析及物理模型加工制作.通过振动台试验和有限元模型计算可知,振动台试验模型的前三阶动力特性与有限元模态分析结果基本一致,地震波作用下的试验结构模型动力反应和有限元时程分析的结果可相互印证.结果表明,提出的振动台试验模型设计原则是有效的,试验和计算分析结果可相互印证,可为进一步研究结构抗震性能、改进结构设计提供依据.

To solve the problem of comparison between calculation and test of steel braced frame-bent structure model,and to study the dynamic characteristics and seismic response of steel braced frame-bent structure system,the SAP2000 software was used to establish the finite element model of prototype structure and improve the original design based on the structural design and PKPM calculation model of a large electrical power plant.Aiming at the structural system with complex mass and stiffness distribution characteristics,the design principles and relevant technical measures of shaking table test physical model to meet the requirements of structural dynamic characteristics consistency were proposed.The structural design,finite element modeling analysis under the same condition and physical model processing were completed for the scaled structure model.Through the shaking table test of physical model and the time-history analysis of finite element model,the first three order dynamic characteristics of the prototype structure and the shaking table test model were basically consistent with the results of the finite element modal analysis.The dynamic response of the experimental structure model under the action of seismic wave and the time-history analysis results of finite element model were mutually verified.Results show that the design principle of shaking table test model proposed in this paper is effective,and the results of test and calculation analysis can be verified mutually,which can provide a basis for further study of seismic performance of structures and improvement of structural design.