摘要
复杂超高钢结构电视塔几何构形多变,质量与刚度分布不均,地震作用下结构应力与变形响应复杂。以高286 m的河南省周口市广播电视塔为背景,建立其三维有限元模型,并对其进行模态分析与反应谱分析;选用El Centro波、Taft波和模拟人工波,分别进行烈度为8度(0.3g)的多遇地震作用下的弹性时程分析;最后,选用人工波进行烈度为8度(0.3g)和9度罕遇地震作用下的弹塑性时程分析。研究结果表明:塔楼处位移和位移角相对较大,为结构的薄弱部位,在抗震设计中应予以重视;罕遇地震作用下,结构位移角满足设计要求;主要受力构件塑性发展程度较低,结构满足"大震不倒"的抗震设防要求,抗震性能良好。
The geometric configurations for super high-rise steel TV towers are complex,the mass and stiffness distributions of those structures are uneven,thus the seismic response of stress and deformation for such structures are very complicated. Based on the case study from a 286-meter-high TV tower in Zhoukou,Henan Province,a 3D finite element model was developed. The modal analysis and response spectrum analysis were conducted. The El Centro,Taft and artificial simulated seismic waves were selected for elastic time-history analysis under frequent earthquakes with seismic intensity of 8 degree. Finally the elastic-plastic time-history analysis was conducted with artificial simulated seismic wave under rare earthquake in seismic intensity of 8 degree and 9 degree. Results showed that the displacement and drift angel of the turrent were both larger than other areas. Therefore the turrent should be treated as the weak part,to which enough attention should be paid in the seismic design. The drift angle of the structure could meet the design requirements under rare earthquake intensity. The degree of plastic development for the primary loadbearing components was low,which could meet the requirement of＂no-collapse under strong earthquakes＂for seismic resistance and verified that the tower structure had sufficient seismic capacity.
出处
《工业建筑》
CSCD
北大核心
2016年第1期165-172,146,共9页
Industrial Construction
基金
"十二五"国家科技支撑计划(2012BAJ13B00)
关键词
钢结构
电视塔
多遇地震
罕遇地震
振型分解反应谱法
时程分析
抗震性能
steel structure
TV tower
frequent earthquake
rare earthquake
mode-superposition response spectrum method
time-history analysis
earthquake resistant behavior
