单层柱面网壳结构的找形  

FORM-FINDING OF SINGLE-LAYER CYLINDRICAL LATTICED SHELLS

作　　者：田伟[1] 董石麟[1] 赵阳[1] 

机构地区：[1]浙江大学空间结构研究中心,浙江杭州310058

出　　处：《工程力学》2012年第6期241-246,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(50638050);教育部新世纪优秀人才支持计划项目(NCET-07-0759)

摘　　要：该文研究刚性网壳结构的合理找形问题,将柔性结构中广泛应用的找形概念引入刚性结构,提出基于力密度法的单层柱面网壳结构的找形方法。通过在找形过程中引入自重,解决了高斯曲率为零的柱面网壳的找形问题,且通过合理找形可基本消除自重引起的弯矩和剪力。找形得到的网壳结构与传统柱面网壳在曲面外形上比较相近,但可大幅度提高单层柱面网壳结构的承载能力。该文提出的找形方法效率高、收敛性好,为单层柱面网壳结构的设计开拓了新的方法和思路。By introducing the concept of form-finding widely used in flexible structures into rigid structures, this paper presents a form-finding method for single-layer cylindrical latticed shells based on the force density method, aimed at investigating the rational form-finding problem of latticed gird shell structures. The form-finding of a single-layer cylindrical latticed shell with zero Gaussian curvature is realized by accounting for the self-weight of the structure during the form-finding process, and the bending moments and shear forces caused by the self-weight may be minimized through the process. The geometrical shape of a form-finding latticed shell is similar to that of a traditional cylindrical shell, but leads to a significant enhancement in the stability beating capacity of the structure. The proposed form-finding method is of high efficiency and good convergence, providing a new approach for the design of single-layer cylindrical latticed shells.

关 键 词：单层柱面网壳 刚性结构 找形 力密度法 稳定承载力 

分 类 号：TU393.3[建筑科学—结构工程]