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 seisinic 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.
出处
《电力建设》
2013年第6期60-64,共5页
Electric Power Construction
基金
河北省自然科学基金项目(E2012402049)
关键词
冷却塔
反应谱
动力时程分析
加速度放大系数
cooling tower
response spectrum
dynamic time-history analysis
acceleration amplification coefficient
