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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 configuration of the complicated ultra-high steel structure television tower is variable, and the distribution of mass and stiffness is uneven. The structural stress and deformation response under earthquake is complex. Based on the 286 m high radio and television tower in Zhoukou City, Henan Province, a three-dimensional finite element model was established, and its modal analysis and response spectrum analysis were performed. El Centro waves, Taft waves, and simulated artificial waves were selected and the intensity was Elastic time history analysis under 8 degree (0.3 g) multi-event earthquake; Finally, the artificial wave was selected for the elasto-plastic time history analysis under the action of 8 degrees (0.3 g) and 9 degree rare earthquakes. The results show that the displacement and displacement angle at the tower are relatively large, which are the weak parts of the structure and should be emphasized in the seismic design; under rare earthquakes, the structure displacement angle meets the design requirements; the plasticity of the main stress components is lower The structure satisfies the requirements of earthquake-resistance for “the big earthquake does not fall down,” and its seismic performance is good.