混凝土折板式拱网壳动力特性的参数化分析  

Parametric Analysis of Dynamic Characteristics for Concrete Folded Plate Arch Shell

作　　者：姜腾钊 张华刚[1,2] 魏威 王勤征 吴琴 JIANG Tengzhao;ZHANG Huagang;WEI Wei;WANG Qinzheng;WU Qin(Space Structure Research Center,Guizhou University,Guiyang 550003,China;Structural Engineering Key Laboratory,Guiyang 550025,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]贵州省结构工程重点实验室,贵州贵阳550025 [3]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）》2020年第2期73-78,共6页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金项目资助(51568012)

摘　　要：折板式拱网壳是由V形折板拱壳网格化而得的新型混凝土空间网格结构,本文采用有限元方法分析纵向两端开敞结构的动力特性,并了解结构整体刚度的主要影响因素。结果表明:屋盖的低阶振型以竖向振动为主,刚度薄弱位置出现在开敞处,因此横向矢高对结构整体刚度的影响较小,而V形密肋折板拱自身的矢高对结构整体刚度的影响较大;横向脊(谷)线拱作为屋盖的主要传力结构,增强其刚度可以明显提高结构的整体刚度;纵向脊线是结构的振动节线,其刚度变化对结构整体刚度影响不大;空腹桁架上弦作为V形密肋折板拱的拱脚边缘支承结构,提高其刚度几乎不改变屋盖结构的整体刚度;提高密肋梁的刚度会同时增大结构质量,因此密肋梁的刚度改变几乎不影响结构基频;由于有限元模型中屋面板中面与梁中面重合,板厚改变不影响结构的基频,屋面板可作为结构的刚度储备。The folded plate shell is a new type of concrete space grid structure which is made of V-shaped folded plate arch shell.FEM was used to analyze dynamic characteristics of open roof at both ends,and to realize main influence factors of structure rigidity.The results show that low-order modes of roof is mainly vertical vibration,and weak stiffness position appears in open place,so transverse vector height has little influence on structure rigidity,while vector height of V-shaped multi-ribbed folded plate arch has a greater influence on structure rigidity.Transverse ridge or valley arch is main force transfer structure of roof.Longitudinal ridge is vibration nodal line of structure and increase of its rigidity has little effect on structure rigidity. The upper chord of vierendeel truss is edge structure on V-shaped multi-ribbed folded plate arch,and improving its rigidity almost do not change structure rigidity.Increasing rigidity of multi-ribbed beams will increase structure mass at the same time,so the change of multi-ribbed beams rigidity hardly affects base frequency of structure.Because middle surface of plate and beam is a coincide in finite element model,the change of plate thickness does not affect base frequency of structure,plate can be used as structure rigidity.

关 键 词：混凝土 双向折板式拱网壳 动力特性 参数化分析 有限元法 

分 类 号：TU311.3[建筑科学—结构工程]