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为研究空间杆系结构的破坏预测方法,针对六角星型穹顶结构进行了理论和实验研究.利用MATLAB数值模拟分析了结构在荷载作用下的变形规律,获得了四种工况下结构刚度矩阵行列式及其变化率在结构破坏过程中的变化特点,建立了基于刚度变化率的空间杆系结构破坏预测方法.为验证理论分析可靠性,进行了相应结构的室内模型破坏试验,并将实测结果与应力变化率法进行对比分析.结果表明,空间杆系结构刚度矩阵行列式在结构破坏前存在明显突变,可用于预测结构破坏并比较不同初始缺陷对结构稳定承载力的影响.结构模型实验验证了刚度变化率法具有预测杆件群失稳破坏的能力,并提高了应力变化率法预测结构破坏的效率.
In order to study the failure prediction method of the spatial structure of the hexagonal star dome, theoretical and experimental studies are carried out on the hexagonal star dome structure.The deformation of the structure under load is analyzed by using MATLAB numerical simulation, and the structure stiffness matrix ranks And its rate of change in the process of structural failure of the change characteristics of the establishment of a rate of stiffness based on the spatial structure damage prediction method.In order to verify the theoretical analysis of the reliability of the corresponding structure of the indoor model failure test and the measured results And stress rate of change method are compared and analyzed.The results show that the determinant of structural stiffness matrix of space bar structure obviously changes before structural failure and can be used to predict the structural failure and compare the effect of different initial defects on the structural stability and bearing capacity. The stiffness rate of change method has the ability of predicting the instability of the rod group, and improves the efficiency of the stress rate of change prediction of structural failure.