摘要
空间KK型双弦杆圆钢管搭接节点以承载力高、搭接率小以及空间交汇杆件较少的优势应用于空间钢管桁架结构体系。本文采用ANSYS程序中8节点Solid45实体单元对平面和空间圆钢管搭接节点试件进行了非线性有限元分析。在破坏模式、变形过程以及节点极限承载力方面将有限元计算与已有试验结果进行比较,证明运用实体有限元分析法求解节点的极限承载力是一种有效的方法。有限元参数分析重点考察了几何参数和弦杆轴向应力对空间KK型双弦杆圆钢管搭接节点极限承载力的影响。在现有钢结构设计规范的基础上,通过对数值结果的回归分析,得到了该类搭接节点的极限承载力计算公式。研究结果表明:未加劲KK型双弦杆节点的极限承载力略低于未加劲K型单弦杆节点极限承载力,内加劲KK型双弦杆节点的极限承载力明显低于内加劲K型节点极限承载力;内加劲板对平面K型圆钢管搭接节点极限承载力可以起到很好的提高作用,但对空间KK型节点极限承载力提高并不明显。
Because of their high ultimate capacity, low overlap ratio and small number of intersection braces, overlapped CHS KK-joint with two chords are used in space tubular truss structures. This paper employs nonlinear finite element method with eight nodes solid element in ANSYS program to examine the mechanical behavior of overlapped CHS uniplanar and multiplanar tested joints. Solid FEM is validated as an efficient method of predicting ultimate capacity of the overlapped CHS KK-joint through comparing failure modes, deformation process and the ultimate capacity with tests results. The effect of geometric parameters and axial stress in chord on the ultimate capacity of the overlapped joints is studied by FEM. Based on the code for designing steel structures, a formula that predicts the ultimate capacity of overlapped CHS KK-joint with two chords is proposed through applying multivariate regression analysis. The research result shows that the ultimate capacity of unstiffened overlapped CHS KK-joint with two chords is slightly lower than that of unstiffened overlapped CHS K-joint, and that the ultimate capacity of stiffened overlapped CHS KK-joint with two chords is obviously lower than that of stiffened overlapped CHS K-joint. It also shows that internal stiffener can obviously improve the ultimate capacity of overlapped CHS K-joint, but has little effect on the ultimate capacity of overlapped CHS KK-joint with two chords.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2007年第3期37-45,共9页
Journal of Building Structures
基金
福建省科技重大专项资助项目(2005YZ1016)
福建省自然科学基金资助项目(E0510022)
华侨大学科研基金资助项目(07BS201)
