混凝土空腹夹层板静力性能的有限元参数分析  

Parametric finite element analysis on static behavior of concrete open-web sandwich plate

作　　者：姚玲[1] 张华刚[1] 何奇[1] 马克俭[1] 李莉[2] 王越 李富江 

机构地区：[1]贵州大学空间结构研究中心,贵州贵阳550003 [2]贵州大学土木工程学院,贵州贵阳550025 [3]黑龙江建工建筑设计研究院有限公司,黑龙江哈尔滨150081 [4]贵州建工监理咨询有限公司,贵州贵阳550065

出　　处：《空间结构》2017年第1期43-53,共11页Spatial Structures

基　　金：贵州省科技厅创新人才团队建设项目(黔科合人才团队[2014]4012号);贵州省协同创新中心建设项目(黔教合协同创新字[2013]09号)

摘　　要：混凝土空腹夹层板可以看作是通过剪力键连接的双重密肋楼盖,为了解其静力性能,考虑组成构件的刚度和结构高跨比影响,采用8节点弹性块体单元有限元模型在四点支承条件下进行25个算例分析.结果表明:结构内力分布与空腹网架类似,但剪力键变形时表现了整体转动的特点,肋及剪力键的承载力设计应计及弯矩影响;增加支承梁(框架梁)刚度有利于降低楼盖的挠度、改善梁边肋的内力分布,建议框架梁在满足楼盖刚度控制前提下采用较小的高跨比;增大结构总厚度可以有效提高其整体刚度及跨中截面承载力,当高跨比在1/30~1/20之间并采用现行规程的实用方法时,应重视楼盖角区上肋的承载力设计;表层薄板对结构刚度和承载力改善的意义不大,可按网格尺寸的1/40~1/30确定其厚度;楼盖的内力分布对肋刚度较为敏感,上、下肋截面高度可按网格尺寸的1/15~1/10确定,实用方法对肋承载力的调整措施需进一步研究;剪力键刚度对楼盖整体刚度的影响较小,工程设计需增大剪力键截面时,应提高楼盖角区和边节间肋的承载力,并应对角区剪力键予以加强.Concrete open-web sandwich plate can be regarded as a double ribbed plate connected by shear connectors. In order to study its static behavior, finite element analyses using 8-node elastic block element are carried out on 25 examples of four point supporting models. The influence of stiffness of structural members and height-span ratio of structure are considered. Results show that internal force distribution of structure is similar to that of the open-web grid structure, but the shear connector has a whole rotation when structure deforms, so the bending moment should be considered in the design of the bearing capacity of ribs and shear connectors. The smaller depth-span ratio can be applied to the frame beam with satisfying floor stiffness requirements, although the increase in stiffness of frame beam can reduce the floor deflection and improve the internal force distribution of ribs near the beam. Increasing the total thickness of structure can effectively improve its overall stiffness and the bearing capacity of section in mid-span. In the current code,when the depth-span ratio of structure is between 1/30~l/20,the bearing capacity design of the ribs in floor corner should be taken seriously. Contribution of the surface plate to the structural stiffness and bearing capacity is not obvious. Its thickness can be taken as 1/40~ 1/30 of grid size. The internal force distribution of floor is more sensitive to the rib stiffness, so the section height of upper and lower ribs can be taken as 1/15 ~ 1/10 of grid size. In the practical method, the adjustment measures for the bearing capacity of ribs need to be further studied. The stiffness of shear connectors has little effect on the overall stiffness of the floor. In the engineering design,when the sectional dimension of shear connectors needs to be increased, the bearing capacity of the ribs in the floor corner and edge grid should be improved, and the shear connectors in corner should be strengthened.

关 键 词：混凝土空腹夹层板 内力 变形 有限单元法 参数分析 

分 类 号：TU375.2[建筑科学—结构工程]