摘要
空间网壳结构的节点是半刚性的,节点刚度对大跨度网壳结构的稳定承载能力有着重要的影响.按节点完全刚接或完全铰接计算会过高或过低地评价结构的稳定承载能力.而具有加劲肋的焊接球节点被广泛应用在大跨度空间网壳结构中.本文采用有限元软件ANSYS对具有各种不同形式加劲肋的焊接球节点轴向刚度和弯曲刚度进行了分析,并与无肋焊接球节点进行了比较.通过回归分析,得出了具有各种不同形式加劲肋的焊接球节点轴向刚度和弯曲刚度的实用计算公式.本文为考虑节点刚度的大跨度网壳结构稳定分析提供了理论基础,并得出了可应用于实际工程的结论.
Joints of spatial reticulated shell are semi-rigid, and joint＇s stiffness has important effect on stability ultimate bearing capacity of large-span spatial reticulated shell. The stability bearing capacity of large-span spatial reticulated shell will be overestimated or underestimated, when joints are regarded as perfect rigid joints or perfect pin ioints. The welded spherical joint with rib stiffeners is a type of joint applied widely on large-span spatial reticulated shell. The axial stiffness and flexural stiffness of welded spherical joint with different types of rib stiffeners are analyzed with the software ANSYS, and compared with that of the non-rib welded spherical ioint＇s stiffness. Then the calculation formulas of the axial stiffness and flexural stiffness under different types of rib stiffeners are given through regression analysis in the paper. Some conclusions were obtained, which can provide theoretical foundation for the non-linear stability analysis considering joint＇s stiffness and can be applied in practical projects.
出处
《空间结构》
CSCD
北大核心
2013年第1期91-96,共6页
Spatial Structures
基金
supported by Zhejiang Provincial National Natural Science Foundation(Y107595)
Science Research Project of Department of Education of Zhejiang(Y200906262)
关键词
焊接球节点
节点刚度
加劲肋
回归分析
welded hollow spherical joints
joint＇s stiffness
rib stiffeners
regression analysis
