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火电厂新型空冷结构体系的抗震性能分析

发表时间:2018-04-28  浏览量:945  下载量:130
全部作者: 白国良,武章印,秦朝刚,樊金承
作者单位: 西安建筑科技大学土木工程学院
摘 要: 为研究新型空冷结构体系的抗震性能,截取原型结构的1/4,建立1/8缩尺的试验结构模型。采用ANSYS有限元分析软件对试验结构模型进行非线性地震响应分析,并基于既有结构体系在地震作用下的不利受力形态,提出一种新型结构体系,即桁架下部增设钢支撑空冷结构体系,并建立有限元计算模型,进行模态分析及非线性地震反应时程分析。分析结果表明,新型结构的自振频率和整体刚度较既有结构均提高了将近1倍;结构位移反应减小80%,桁架悬挑端挠度减小77%,悬挑端下弦杆内力减小48%;极大地提高了结构的抗震性能。从整体结构来看,新型结构体系的刚度大大增加,当地震来临时,极大地减小了最大位移、悬挑端挠度和下弦杆内力,这些都说明了此结构具有优越的抗震性能。
关 键 词: 土木建筑结构;复合结构;新型空冷结构体系;模态分析;非线性时程分析;钢支撑
Title: Analysis of seismic performance of new type air cooling system in thermal power plant
Author: BAI Guoliang, WU Zhangyin, QIN Chaogang, FAN Jincheng
Organization: School of Civil Engineering, Xi’an University of Architecture & Technology
Abstract: In order to study the seismic performance of new type air cooling system, a 1/8 scaled model generated from a 1/4 substructure of prototype structure was constructed to conduct the experimental structural model. ANSYS finite element analysis software was used to analyze the nonlinear seismic response of the experimental structural model. Based on the adverse stress form of the existing structure under the seismic action, a new type air cooling structure system was proposed, that is, the lower truss with additional steel braces air cooling system, and the finite element model was established, the modal analysis and nonlinear seismic response analysis were conducted. The results from finite element model analysis show that: compared with the existing structure, the new structure has nearly doubled the natural frequency and the overall stiffness; the structural displacement response is decreased by 80%, the deflection of the truss cantilever end is reduced by 77%, the cantilever end of the bottom chord force is reduced by 48%; which greatly improve the seismic performance of the structure. From the overall structure, the stiffness of new type structure system increases greatly, and when the earthquake comes, the maximum displacement, cantilever end deflection and the internal force of bottom chord bar cantilever end are all reduced. All of these show the superior seismic performance of the new type structure.
Key words: civil construction structure; composite structure; new type air cooling system; modal analysis; nonlinear time history analysis; steel support
发表期数: 2018年4月第8期
引用格式: 白国良,武章印,秦朝刚,等. 火电厂新型空冷结构体系的抗震性能分析[J]. 中国科技论文在线精品论文,2018,11(8):799-807.
 
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