联方凯威特型弦支穹顶结构稳定性分析

以联方凯威特型弦支穹顶结构为研究对象,应用ANSYS数值模拟分析结构的稳定性,并且通过改变结构的设计参数来找出影响稳定性的因素.研究发现,联方凯威特弦支穹顶结构的稳定性优于对应的单层网壳结构,活荷载的不均匀分布加速了结构的失稳.并且从结构矢跨比、支撑杆长度和预应力水平三个方面进行参数分析,结果表明,前两个因素对结构稳定性的影响明显,而预应力水平对结构的稳定性影响不明显.

Stability Analysis of Lamella-Kiewitt Suspend-dome Structures

Taking Lamella-Kiewitt suspend-dome structures as the investigation subject,and the structural stability analysis was carried out by ANSYS commercial software,and factors that affect the stability were found out by changing design parameters of the suspend-dome structure.Several conclusions could be made as follows,Lamella-Kiewitt suspend-dome structures had better stability than single-layer domes,and the uneven distribution of live loads accelerated the structure instability.Meanwhile,the parameter analyses were performed from three aspects of the rise-span ratio,the length of the studdle and the prestress level.The results indicated that the first two factors had obvious influence on the structure stability,but the prestress level hadn＇t obvious influence.