间接空冷塔地震反应特性研究
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摘要
为了揭示超大型冷却塔的地震反应特性,以某电厂超大型间接空冷塔为背景,使用通用有限元软件ANSYS建立有限元模型,对结构进行水平地震作用下的反应谱及动力时程分析。计算结果表明,冷却塔支柱的加速度放大系沿高度增加,塔筒的加速度放大系数沿高度递减,支柱与塔简连接点处加速度放大系数达到最大;动力时程分析法得的结果大于反应谱分析法得到的结果,最大值增加27.90%,因此将抗震动力时程分析作为设计时的比较、补充、验算手段是非常必要的;在进行地震高烈度区冷却塔的结构设计时,应对塔筒与支柱连接处采取结构加强措施。
In order to study the earthquake response behaviors of cooling tower,the large-sized universal finite element software ANSYS is used to establish the structural finite element model for super large scale indirect air-cooled tower in a power plant,and its response spectrum and dynamics time-history is analyzed under the action of horizontal earthquake.The calculation results show that the acceleration amplification coefficient of cooling tower pillar increases along with the tower height,while that of tower drum decreases along with the tower height,so the acceleration amplification coefficient reaches the maximum value at the pillar-drum junction.The result obtained with dynamic time-history analysis is more than that with response spectrum analysis,in which the maximum value increases by 27.90%.Therefore,it is very necessary that dynamic time-history analysis on seismic response characteristics is taken as a comparison,supplement,checking calculation method in the course of design.Strengthening measures should be carried out on the pillar-drum junction in the structure design of cooling tower located in the high seismic intensity area.
In order to study the earthquake response behaviors of cooling tower,the large-sized universal finite element software ANSYS is used to establish the structural finite element model for super large scale indirect air-cooled tower in a power plant,and its response spectrum and dynamics time-history is analyzed under the action of horizontal earthquake.The calculation results show that the acceleration amplification coefficient of cooling tower pillar increases along with the tower height,while that of tower drum decreases along with the tower height,so the acceleration amplification coefficient reaches the maximum value at the pillar-drum junction.The result obtained with dynamic time-history analysis is more than that with response spectrum analysis,in which the maximum value increases by 27.90%.Therefore,it is very necessary that dynamic time-history analysis on seismic response characteristics is taken as a comparison,supplement,checking calculation method in the course of design.Strengthening measures should be carried out on the pillar-drum junction in the structure design of cooling tower located in the high seismic intensity area.
引文
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[2]Nagarajaiah S.System identification of base isolated UBS hospital building from recorded response[J].Shock and Vibration Digest, 2000,32(1 ):28.
[3]刘先明.大跨度空间网格结构多点输入反应谱理论的研究与应用[D].南京:东南大学,2003.
[4]GB 50191—1993构筑物抗震设计规范[S].北京:中国计划出版社,1993.
[5]克拉夫R,彭津J.结构动力学[M].王光远,译.北京:高等教育出版社,2006:252-256.
[6]张治勇,刘殿魁,孙柏涛.火力发电厂抗震研究概况[J].世界地震工程,1999,15(1):34-40.
[7]许荣彬.超大型冷却塔的地震反应分析[J].山西建筑,2011,37 (33):44-45.
[8]陈卫兵.双曲线冷却塔结构动力特性研究[D].武汉:武汉大学,2005.
[9]北京大学固体力学教研室.旋转壳的应力分析[M].北京:水利电力出版社,1979.
[10]丁阳,王波.大跨度空间网格结掏在地震行波作用下的地震响应[J].地震工程与工程振动,2002,22(5):71-76.
[11]JGJ 3_2002高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社,2002.
[12]孔麟.超大型间接空冷塔的地震反应分析[D].西安:西安理工大学,2009.
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