大型火力发电厂框排架混合结构主厂房动力特性试验与分析

Experiment and analysis of dynamic characteristics of a main building with frame-bent structures in large thermal power plants

选取1000MW大型火力发电厂新型混合结构主厂房体系的三跨三榀进行缩尺比为1/7的空间模型试验研究。采用锤击法测试模型结构的动力特性,得到其自振频率和振型,并根据相似关系换算到原型结构。使用SAP2000软件建立混合结构主厂房模型和原型结构的有限元模型,进行模态分析,得到模型和原型结构的频率和振型,并与试验结果进行对比分析。可为大型火力发电厂新型混合结构主厂房体系的抗震性能研究提供依据。

A 1/7 scale space model experiment of three spans and three frames has been carried out,which are made from a new main building with frame-bent structures in 1 000MW large thermal power plants . The natural vibration frequencies and mode shapes of experimental model were obtained with hammering method, and dynamic characteristics of prototype structure are acquired according to similarity relationships. The finite element model of the prototype structure in the main building built with SAP2000 software is used to analyze structural modal. The natural vibration frequencies and mode shapes of the structure are obtained and compared with experimental results. The results provided for a base for study on seismic performance of the main building with frame-bent structures in 1 000MW large thermal power plants.