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以某不规则空间网状结构为研究对象,利用有限元软件SAP 2000建立弹塑性分析模型。按目标反应谱进行选波的方法,选取2组天然地震波及1组人工地震波,根据三维三向地震波激励的输入原则设置12种工况,并对不规则空间网状钢结构在罕遇地震作用下的弹塑性动力时程进行分析。结果表明:结构的整体刚度较大,在9度罕遇地震作用下最大位移值小于位移限值。结构出现的塑性铰较少,主要分布在相对较薄弱的中心圆环处,少数构件出现轻微损坏。结构达到预定的抗震性能目标,具有良好的抗震能力。
With an irregular spatial network structure as the research object, a finite element software SAP 2000 was used to establish the elastoplastic analysis model. According to the target response spectrum selection method, two groups of natural seismic waves and one group of artificial seismic waves are selected. According to the input principle of three-dimensional three-direction seismic excitation, 12 kinds of working conditions are selected, and the effect of irregular space network steel structure on rare earthquakes Under the elastic-plastic dynamic time history analysis. The results show that the overall stiffness of the structure is large, and the maximum displacement value is less than the displacement limit under the effect of 9 degree rare earthquakes. The plastic hinge appears less in the structure, mainly in the relatively weak central ring, a few minor damage occurred. Structure to achieve the predetermined seismic performance targets, with good seismic capacity.