K6型单层球面木网壳整体稳定性能研究  

esearch on global stability of K6-type single-layer spherical timber reticulated shells

作　　者：欧加加[1,2] 陈迪 龙卫国[1] 何敏娟[2] 刘宜丰[1] OU Jiajia;CHEN Di;LONG Weiguo;HE Minjuan;LIU Yifeng(China Southwest Architectural Design and Research Institute Co.,Ltd,Chengdu 610041,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]中国建筑西南设计研究院有限公司,四川成都610041 [2]同济大学土木工程学院,上海200092

出　　处：《建筑结构学报》2023年第12期72-81,共10页Journal of Building Structures

基　　金：中建股份科技研发课题(CSCEC-2021-Z-40);中建西南院科技研发计划(R-2022-64-S-Y-2023)。

摘　　要：为了研究K6型单层球面半刚性木网壳结构的整体稳定性能,基于欧洲规范EN 1995-1-1中相关公式,计算销轴类紧固件滑移刚度及承载力,确定实际工程中常用的插板式节点的简化弯矩-转角曲线,并在ANSYS软件中采用COMBIN39非线性弹簧单元模拟节点的抗弯半刚性,通过有限元分析研究不同参数对一阶线性屈曲系数、考虑初始缺陷的弹性及弹塑性极限承载力系数,以及塑性折减系数的影响。单一变量参数分析结果表明,高跨比、跨度、截面尺寸和初始缺陷对稳定承载力影响很大,实际节点紧固件的布置模式减小了节点刚度的变化幅度,限制了节点半刚性的影响。通过变化参数得到的6480个算例,统计不同高跨比和节点刚度折减系数下的塑性折减系数,其值均小于钢网壳规范建议值(0.47)。To study the global stability of K6-type single-layer spherical timber reticulated shell structures with semi-rigid joints,the slip stiffness and the bearing capacity for bolted fasteners were calculated according to formulas in the Eurocode EN 1995-1-1,and the simplified bending moment-rotation curves of slotted-in plate joints which are commonly used in practical engineering were determined.The bending semi-rigidity characteristics of the joints were simulated by the nonlinear spring element COMBIN39 in ANSYS software.The effects of different parameters on first-order linear buckling coefficient,elastic and elasto-plastic ultimate bearing capacity factors considering initial defects and plastic reduction factor were analyzed.The results of single-variable parameter analysis show that height-span ratio,span,section size and initial defect have great influence on the stability bearing capacity,and the arrangement of joint fasteners reduce the variation range of the joint stiffness which limits the influence of the semi-rigidity of joints.By 6480 calculation cases with varying parameters,the plastic reduction factors under different height-span ratios and joint stiffness reduction factors are calculated,and results show that all the values of plastic reduction factors are smaller than 0.47 which is the recommended value of the steel reticulated shell specification.

关 键 词：单层球面木网壳 有限元分析 半刚性节点 塑性折减系数 整体稳定性 

分 类 号：TU356[建筑科学—结构工程] TU366.3TU311.41