索穹顶结构的找力分析方法--不平衡力迭代法

索穹顶的刚度和承载能力都是通过施加预应力来获取的,预应力设计是对索穹顶进行任何其它分析的基础,所以它的找力分析(Force finding)是一项很重要的工作。本文提出一种找力分析方法———不平衡力迭代法,它可以克服整体可行预应力法的一些不足:即使在索穹顶构件分组发生错误时仍可找到满足已知形状的预应力分布,并且该方法具有良好的稳定性和运算效率,算例表明不平衡力迭代法非常适合大型复杂索穹顶结构的找力分析。

Force Finding of Tensegrity Cable Domes --Imbalance Force Iterative Method

The cable dome has no stiffness or load carrying capacity unless it has been prestressed.The subsequent analysis is based on a success prestressing design,so the analysis of force finding is very important.A new force finding method named imbalance force iterative method is proposed,which breaks some limitations of integrity feasible prestressing method.For instance,even if assigning groups by mistake,the prestressing distribution that satisfies the known geometry form can also be found.The numerical results indicate the stability and efficiency of this method for large and complicated cable domes.