开口式正方形刚性索穹顶的性能与灵敏度分析

Performance and sensitivity analysis for open type square rigid cable dome structure

针对索穹顶结构形式单一、脊索容易退出工作等问题,提出一种开口式正方形刚性索穹顶结构。以一个跨度为48 m,矢跨比为1/16的开口式正方形刚性索穹顶结构为例进行了性能分析,同时采用常用的Monte Carlo法分析其灵敏度。结果表明,在荷载作用下,节点位移变化平稳,且最大位移值较小。在位移控制下,对结构失效较为敏感的随机变量为刚性杆件截面面积、刚性杆件弹性模量和均布荷载。

To solve the withdrawal problem of ridge cables,form singleness of cable dome structure,the new conception of open type square rigid cable dome structure is presented. An 48 m-span and 1/16 rise-span ratio open type square rigid cable dome was studied. Monte Carlo method based on orthogonal design response surface was proposed to make sensitivity analysis under double randomness. The results show that the displacement of the square rigid cable dome is changing linely. Controlled by displacement,sectional area of rigid member,load and prestress level of outermost diagonal cable are more sensitive for structural failure.