周边双层中部单层球面网壳结构的特征值屈曲分析及其极限承载力  

Eigen-buckling Analysis and Ultimate Bearing Capacity of theCentral-single-layer and Peripheral-double-layer Reticulated Dome

作　　者：韩庆华[1] 刘锡良[1] 陈志华[1] 

机构地区：[1]天津大学土木工程系,天津300072

出　　处：《建筑结构学报》2002年第3期69-74,83,共7页Journal of Building Structures

基　　金：国家自然科学基金项目(50008010)资助。

摘　　要：在大跨结构中,将单双层网壳结合起来形成的一种结构形成———周边双层中部单层球面网壳结构,可充分发挥两种结构形式的优点。本文采用刚铰接模型,即单层部分采用空间梁单元、双层部分采用空间杆单元,应用BlockLanczos方法对该种网壳结构进行了特征值屈曲分析;采用柱面等弧长技术跟踪了网壳结构的平衡路径。在对网壳结构进行多参数分析的基础上,包括单双层跨度比、矢跨比、杆件规格等,总结了单双层网壳结构的失稳规律,得出了临界荷载和极限荷载的拟合计算公式,并与一实际工程的数值分析结果进行了比较。The advantages of two different structural types can be fully developed by combining the single-layer spherical dome and the double-layer square pyramid space grids into a new structural type.The eigenvalue and the eigenvectors are analyzed using the Block Lanczos method with the rigid-pin-joint model in which the space beam element is used in the single-layer part and the space bar element is used in the double-layer part.The equilibrium path is traced using the cylindrical arc length technology.Based on the analysis of several factors including the single-double-layer span ratios,the height-to-span ratios and the pipe types,the stability behavior can be summarized and the fitting formulae for critical load and ultimate load are obtained.The comparison between the simplified formula and the numerical analysis of an engineering project is given as weel.

关 键 词：周边双层 单层球面 网壳结构 特征值屈曲分析 极限承载力 临界荷载 

分 类 号：TU356[建筑科学—结构工程]