论文部分内容阅读
本文以空间刚接杆系为计算模型,研究了单层网壳的线性和非线性分枝屈曲分析方法,探讨了一种跳跃失稳的近似分析方法,并编制了计算机程序。 本文提出了“修正相关行列式”的概念,能迅速和准确求解非线性分枝屈曲的第一幅界荷载,并且给出求解相应屈曲模态的方法。本文在采用考虑(?)力影响的精确刚度矩阵的基础上,用直接迭代法,得到相应的荷载位移曲线,并最后得出跳跃失稳或极限荷载近似值。现有算例表明,该方法与大挠度分析方法所得结果接近。
In this paper, the spatial rigid-joint system is used as the calculation model. The linear and nonlinear branch buckling analysis methods of single-layer reticulated shells are studied. An approximate analysis method of jumping instability is discussed and a computer program is developed. This paper proposes the concept of “corrected correlation determinant”, which can quickly and accurately solve the first boundary load of nonlinear branch buckling, and gives the method for solving corresponding buckling modes. In this paper, based on the accurate stiffness matrix considering the influence of (?) force, the corresponding load-displacement curve is obtained by direct iterative method, and the ultimate value of jump instability or ultimate load is finally obtained. The existing examples show that this method is similar to the results obtained by the large deflection analysis method.