混凝土折板式拟球面网壳的弹性稳定分析  

Elastic Stability Analysis of Concrete Folded-plate Quasi Spherical Reticulate Shell

作　　者：陈寿延 张华刚[1] 李富江 吴琴[1] 王勤征 朱锐 CHEN Shouyan;ZHANG Huagang;LI Fujiang;WU Qing;WANG Qinzhen;ZHU Rui(Research Center of Space Structure,Guizhou University,Guiyang 550003,China;Guizhou Construction Supervision & Consulting Co.Ltd,Guiyang 550081,China)

机构地区：[1]贵州大学空间结构研究中心,贵州贵阳550003 [2]贵州建工监理咨询有限公司,贵州贵阳550081

出　　处：《贵州大学学报（自然科学版）》2018年第6期87-92,共6页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金资助项目(51568012)

摘　　要：混凝土折板式拟球面网壳是通过在球面上切割平面后再网格化而成,结构由密肋平板在脊线处交汇组成,本文采用有限元方法分析其弹性稳定性能,并讨论主脊线、副脊线、密肋梁、支座环梁等的抗弯刚度以及矢跨比、屋面板厚度等因素对其临界荷载的影响。结果表明:结构的低阶失稳模态关于主脊线对称,靠近支座环梁的密肋平板刚度相对较弱;矢跨比是影响结构临界荷载的重要因素,且不宜低于1/8;主脊线是结构低阶失稳模态的节线,其抗弯刚度对结构临界荷载的影响较小;提高副脊线的抗弯刚度可以有效增大结构的临界荷载;支座环梁抗弯刚度的增加对临界荷载的影响较小,其截面高度可按自身跨度的1/12;密肋梁的抗弯刚度对结构临界荷载的影响较大,提高密肋梁的截面高度有利于增强结构抵抗失稳的能力;屋面板的厚度改变对结构临界荷载的影响较小。Concrete folded-plate quasi spherical reticulate shell is composed of ribbed-plate that meets at ridge line,and the ribbed-plate is cut from the spherical.In this paper,structure′s elastic stability was analyzed by the finite element method,and the influence of the flexural rigidity of main ridge,deputy ridge,ribbed beam,support ring beam,and that of rise-span ratio and roof thickness on the critical load were discussed.Results show that the low-order instability mode of structure is symmetric about main ridge line,and the stiffness of ribbed plates near support ring beam are relatively weak.The rise-span ratio is an important factor affecting the critical load of structures and cannot less than1/8.Main ridge line is nodal line of structure′s low-order instability mode,and its flexural rigidity has little influence on the critical load of structure.Increasing flexural rigidity of deputy ridge can effectively increase critical load of structure.Increasing of flexural rigidity of the support ring beam has little effect on critical load,and its section height can be1/12of its span.Flexural rigidity of ribbed beam has great influence on the critical load of structures,increasing the cross section height of ribbed beam is beneficial to strengthening ability of structure to resist instability.Change of the roof thickness has little effect on the critical load.

关 键 词：混凝土折板式拟球面网壳 弹性稳定 失稳模态 临界荷载 有限元法 

分 类 号：TU313.1[建筑科学—结构工程]