联方型弦支穹顶研究

在分析天保中心弦支穹顶的工程实例及相关研究的基础上,提出了弦支穹顶的二阶段分析方法。采用二阶段分析方法,对选定的结构模型,与单层网壳相比较,分析了联方型弦支穹顶的结构性能。研究了不同矢跨比、不同撑杆长度、不同节点刚度等参数变化条件下联方型弦支穹顶的特性,同时考虑了不同的荷载组合情况。对联方型弦支穹顶进行了屈曲分析。研究分析结果表明弦支穹顶须按预应力模型进行分析;联方型弦支穹顶是一种高效的结构形式,其屈曲承载力大于相应的单层球面网壳;二阶段分析法是弦支穹顶一种有效的分析设计方法;较为浅平的弦支穹顶的拉索预应力应进行专项分析;撑杆较长有利于增大抵抗力并避免环向拉索的松弛;不对称荷载为主要工况时有必要对拉索的松弛进行专题校核分析。

ANALYSIS OF LAMELLA SUSPENDOME SYSTEMS

Based on an analysis of the suspendome in the Tianbao Ce nter Project and other related studies,a two-stage calculation method is put fo rward. For a selected structural model, comparing with a single-layer dome,features of the lamella suspendome are ana lyzed using the two-stage calculation method. The main characteristics of a la me lla suspendome are studied for different rise-span ratios, different strut leng ths and different connection rigiditie s, with different load combinations being taken into account. Buckling analysis of the lamella suspendome is carried out. The following conclusions c an be obtained:1.suspendome should be analyzed with prestress model,2.lamella suspendome is a highly effective structural system and its buckli ng bearing capacity is larger than that of single-layer dome,3.the proposed tw o -stage calculation method is an efficient analysis and design method,4.special a nalysis should be done for the prestress of circumferential cable in a flat susp endome,5.longer strut is good for the structural resistance and for avoiding slack of the circumferential cable,6.special analysis needs to be carried out f or slack of the circumferential cable when asymmetric load is dominant.