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根据河北北方学院体育馆项目建立模型,利用MIDAS有限元软件分析弦支穹顶结构在自重及预拉力作用下的初始受力状态.利用ABAQUS有限元软件对弦支穹顶结构进行全过程分析,研究其考虑几何非线性、材料非线性的稳定性能,提出适用于弦支穹顶的初始几何缺陷施加方法和只进行几何非线性全过程分析时的安全系数取值,量化材料非线性对稳定极限承载力的影响.结果表明,从工程设计角度出发,建议采用N阶特征缺陷模态法(N取20),取其最小值作为稳定承载力;当大跨度扁平弦支穹顶结构由稳定承载力控制时,宜进行弹塑性稳定分析,按弹塑性稳定极限承载力安全系数2.0进行设计优化.
According to the establishment model of Hebei North University Gymnasium Project, the initial stress state of the suspen-dome structure under self-weight and pre-tensioning is analyzed by using MIDAS finite element software.The whole process of the suspend-dome structure is analyzed by ABAQUS finite element software, Geometric nonlinearity and material nonlinearity, the method of applying initial geometric imperfections applied to the chordal dome and the value of the safety factor for the full geometrical nonlinear analysis are presented. The effect of material nonlinearity on the ultimate load-bearing capacity The results show that from the perspective of engineering design, it is recommended to use N - order characteristic defect modal method (N = 20) and take the minimum value as the stable bearing capacity. When the long - span flat chordal dome structure is controlled by the stable bearing capacity, Elasto-plastic stability analysis, according to the elastic-plastic stability of the ultimate bearing capacity of 2.0 safety factor design and optimization.