钢桁架-钢筋混凝土管柱结构抗震性能研究
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摘要
某火力发电厂采用钢桁架-钢筋混凝土管柱结构。为了有效评价该结构的安全状况和弥补抗震设计依据不足,采用模型试验和有限元数值分析相结合的方法研究了实际结构的动力特性和抗震性能。结果表明,试验数据与计算结果吻合较好,结构能满足抗震设防要求,但应考虑结构抗扭问题和管柱的重力二阶效应,管柱节点和屋面支撑空冷设备的三角形钢架(A形架)下部是薄弱部位,管柱裂缝比实心柱大,裂缝主要在柱下部,应提高柱端箍筋加密高度,桁架悬挑部位挠度超过限值,地震作用下桁架悬挑部分杆件内力变化剧烈,应增大设计截面。
A steel truss-reinforced concrete column structure is established in thermal power plant.In order to effectively evaluate the structural safety condition and make up shortage of earthquake-resistant design basis,the actual structural dynamic property and seismic behavior were studied through model test and finite element analysis.Results show that experimental data agrees well with calculated results.Structure meets requirements for fortification against earthquakes.Torsion and pipe column gravity second order effect must be considered.Column joints and A shape structural bottom are weak.Column crack area is larger than that of solid column.Cracks are mainly centered at column bottom.Column end hoop reinforcement should be up.Cantilever deflection is over limit.Cantilever member inner force is easily changed under earthquake action,and their sections should be increased in design.
A steel truss-reinforced concrete column structure is established in thermal power plant.In order to effectively evaluate the structural safety condition and make up shortage of earthquake-resistant design basis,the actual structural dynamic property and seismic behavior were studied through model test and finite element analysis.Results show that experimental data agrees well with calculated results.Structure meets requirements for fortification against earthquakes.Torsion and pipe column gravity second order effect must be considered.Column joints and A shape structural bottom are weak.Column crack area is larger than that of solid column.Cracks are mainly centered at column bottom.Column end hoop reinforcement should be up.Cantilever deflection is over limit.Cantilever member inner force is easily changed under earthquake action,and their sections should be increased in design.
引文
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[2]Bartz J H.Dry cooling of power plants a maturetechnology[J].Power Engineering,1998,10(2):16-20.
[3]Dekker N,Venter P,Parrock A.Direct air cooledcondenser support platform at Matimba Power Station[J].Civil Engineer in South Africa,1987.
[4]赵春莲.大型火力发电厂空气冷凝器平台计算研究分析[D].西安:西安建筑科技大学,2005.(ZhaoChunlian.Ansys on air cooled support structure systemin large thermal power plant[D].Xi’an:Xi’anUniversity of Architecture&Technology,2005.(inChinese))
[5]白国良,赵春莲,李晓文,等.大型火力发电厂空冷支架结构体系研究报告[R].西安:西安建筑科技大学,2006.(Bai Guoliang,Zhao Chunlian,Li Xiaowen,et al.Report on air cooled support structure system inlarge thermal power plant[R].Xi’an:Xi’anUniversity of Architecture&Technology,2006.(inChinese))
[6]郑山锁.动力试验模型在任意配重条件下与原型结构的相似关系[J].工业建筑,2000,13(3):35-39.(Zheng Shansuo.Simulation relations on dynamicexperimental model under counterweight and prototypestructure[J].Industrial Building,2000,13(3):35-39.(in Chinese))
[7]傅恒箐.建筑结构试验[M].北京:冶金工业出版社,1992.(Fu Hengqin.Structural experiment[M].Beijing:Metallurgy Industry Press,1992.(inChinese))
[8]姚谦峰,陈平.土木工程结构试验[M].北京:中国建筑工业出版社,2001.(Yao Qianfeng,Chen Ping.Civil engineering structural experiment[M].Beijing:China Architecture&Building Press,2001.(inChinese))
[9]朱伯龙.结构抗震试验[M].北京:地震出版社,1989.(Zhu Bolong.Structural seismic experiment[M].Beijing:Seismological Press,1989.(inChinese))
[10]GB 50011—2001建筑抗震设计规范[S].(GB50009—2001 Code for seismatic design of buildings[S].(in Chinese))
[11]白国良,赵春莲,李晓文,等.空冷支架结构管柱性能试验研究报告[R].西安:西安建筑科技大学,2006.(Bai Guoliang,Zhao Chunlian,Li Xiaowen,et al.Experiment on column poperties of air cooledsupport structure[R].Xi’an:Xi’an University ofArchitecture&Technology,2006.(in Chinese))
[12]任重.ANSYS高级技术分析指南[M].北京:北京大学出版社,2003.(Ren Zhong.ANSYS guidelines forhigh technology analysis[M].Beijing:BeijingUniversity Press,2003.(in Chinese))
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