索穹顶结构的预应力设计方法

THE METHOD OF PRESTRESS DESIGN FOR CABLE DOME

作为一种预应力结构 ,索穹顶的刚度和承载能力都是通过施加预应力来获取的 ,因此 ,预应力设计是对索穹顶进行任何其它分析的基础。借鉴膜结构找形方法之一的力密度法的思路 ,可以得到索穹顶的预应力设计的方法 ,而且 ,还可以利用索穹顶本身的对称性条件和成形条件来进一步简化推导过程。通过分析发现 ,预应力设计的结果实际上就是一个齐次线性方程组的解空间。应用这一方法对一典型的辐射形索穹顶算例进行分析 。

As a prestressed structure,the cable dome has no stiffness or loading capacity until it is prestressed.The subsquent analysis is based on a success prestress design.A method of prestress design for cable dome is presented here.The principle of the method is similar to the Force Density Method for membrane structure.The derivation can be simplified based on the symmetry of the structure.The result of the prestress design is actually the solution space of a homogeneous linear equation set.A typical cable dome was analysed and the prestress value was computed with this method.