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根据弦支穹顶结构的受力特点,建立梁元、杆元和索元的混合有限元动力分析模型.提出利用动态增量法,根据B-R判别准则,提取各级地震加速度幅值下的节点最大位移作为动力响应特征参数,探讨大跨度、小矢跨比开口Kiewitt型弦支穹顶结构在地震作用下的动力稳定极限承载力的研究方法.通过改变结构参数、几何参数等诸多因素来研究其对地震作用下结构动力稳定临界值的影响.分析表明,初始缺陷会明显降低弦支穹顶结构的动力稳定临界值,矢跨比、预应力值和杆件截面对于结构的动力稳定性不呈单调变化.
According to the force characteristics of the suspen-dome structure, a hybrid finite element dynamic analysis model of beam element, rod element and cable element is established. According to the BR criterion, the dynamic incremental method is used to extract the maximum nodes under different magnitudes of earthquake acceleration Displacement as the characteristic parameter of dynamic response to study the research method of dynamic stability ultimate bearing capacity of Kiewitt-type suspen-dome structure with large-span and small-span ratio opening under earthquake action. The results show that the initial defect will obviously reduce the dynamic stability critical value of the suspen-dome structure. The ratio of the span to span, the prestress value and the cross section of the member do not change monotonically with respect to the dynamic stability of the structure. .