圆形平面轴对称索穹顶结构成形后的刚度计算

根据文献１滑移索单元迭代计算的基本思想，针对脊索呈辐射状分布的轴对称索穹顶结构，提出了成形后的刚度计算方法。利用Ｌａｇｒａｎｇｉａｎ坐标描述法建立了受压桅杆及拉索的大位移切线刚度矩阵，基于虚功原理建立了索穹顶结构的非线性静力平衡方程，给出了滑移索单元计算的基本公式、方法和步骤，并进行了实例计算。结果表明，方法是可行的，可供设计和施工时参考。

Computation Method for Initial Stiffness of Axial Symmetric Cable Domes with Circular Plane after Forming

According to the analysis idea of iterating computation with sliding cable elements in reference[1],a computation method of initial stiffness after forming for axial symmetric cable domes with radiant ridge cables is presented in the paper. Using the Lagrangian method and in terms of the virtual displacement principle,the large displacement tangent stiffness matrix of the compression posts and the tension cables were established respectively,and the nonlinear governing equation of the cable domes was obtained.The computation methods and formula for using the sliding cable element in reference[1] were given.Using the paper's model,the authors computed one example,and the results showed well.Methods presented in this paper can be applied in the design and construction of cable domes.