双曲面网壳半刚性节点试验及弹塑性屈曲分析  

Experimental Research and Elastic-plastic Buckling Analysis on Semi-rigid Joint of Hyperboloid Shell Structure

作　　者：刘树堂[1] 张志[1] 周敏辉[2] 刘会乐 

机构地区：[1]广州大学土木工程学院,广东广州510006 [2]广东省建筑设计研究院,广东广州510010

出　　处：《土木工程与管理学报》2018年第1期34-42,共9页Journal of Civil Engineering and Management

摘　　要：为研究X形节点刚度对网壳结构弹塑性屈曲性能的影响。本文以广东移动南方基地大型双曲面单层网壳结构为背景,对4组X形节点进行平面内、外的弯曲刚度试验和有限元模拟,得到X形节点各杆件的弯矩–转角曲线,进而计算出节点各杆件的名义转动刚度值。结果表明:支座约束情况对节点转动刚度影响较大;平面外荷载下,节点转动刚度大,可按刚接处理;平面内荷载下,节点半刚性不容忽视。基于试验结果,考虑结构安装缺陷,采用MATRIX27单元对网壳节点刚度进行模拟,得到结构倒塌破坏全过程的荷载–位移特性,并对网壳节点在不同转动刚度下的极限承载力进行了对比分析。结果表明:X形节点转动刚度减小,网壳结构极限承载力降低;安装缺陷增大,网壳稳定性减弱。In order to study the effects of the stiffness of X-shaped joints on elastic-plastic buckling behaviors of reticulated shell structure,based on a large hyperboloid single-layer reticulated shell structure which is the south base of Guangdong Mobile,4 groups of bending stiffness tests and simulations are carried out. Meantime,moment-rotation curves of members of joints are obtained,and nominal rotational stiffness is calculated. The results show that the constraint conditions of supports have large effect on rotation stiffness of members of joints. Under out-of-plane loading,the rotation stiffness of joints is large and joints can be treated as rigid connections. Under the in-plane loading,joints show typical semi-rigid characteristics. Based on the test results and considering the defect of structural installation, the joint stiffness of reticulated shell structure is simulated by element MATRIX27 and the load-displacement characteristics are obtained in the analysis of structural collapse. The ultimate bearing capacity of the structure with different rotation stiffness of joints is comparatively analyzed. The results show that the smaller the rotation stiffness of the X-shaped joints is,the lower the ultimate bearing capacity of reticulated shell structure is. Meantime,the larger the defect of structural installation is,the weaker the stability of reticulated shell is.

关 键 词：双曲面网壳 X形节点刚度试验 半刚性节点 初始缺陷 稳定性 

分 类 号：TU399[建筑科学—结构工程]