摘要
本文研究矩形钢管贯通式节点的抗弯性能。进行了5组试件平面内和平面外的弯曲试验。通过试验数据和相应的有限元计算,分析了节点几何特征对传力机理和变形的影响。研究指出,管件在节点区的非直接过渡造成的传力路径弯折和应力集中,是造成贯通式节点弱刚度、低强度的主要原因;采用与钢管等壁厚的节点,将使节点屈服承载力低于相连管件的边缘屈服弯矩。本文指出基于弹性阶段刚度评价的节点分类与基于节点承载力极限状态的分类是有区别的。在大量有限元算例的基础上,回归出节点弹性弯曲刚度的计算公式,并提出了适用于一般计算软件的分段变刚度模型。实际工程算例表明,虽然对于某些以稳定控制设计的结构可以采用这类节点,但在结构非线性分析中,必须考虑节点有限刚度的影响。
The bending properties of the through-type rectangular tubular joints were researched. Five sets of specimens were loaded with bending moments in-plane and out-of-plane. By the experiments and FEM analysis, the effects of joint geometry on the mechanism of loading transferring and joint deformation were analyzed. The non-straight connection of the steel plates in joint zone made the obstacle of stress flow and the stress concentration, which was the main reason why this kind of joint behaved lower stiffness and capacity. When the thickness of joint plates was the same as that of tubes, the yielding capacity of the joint would be lower than the yield moment of tubes connected. It was pointed out that the joint classification based on stiffness evaluating during elastic stage was different from the one based on limit state of bearing capacity of joint. Based on FEM computation, formulae for plastic bending stiffness of joint are proposed, and a model of multi-rigidity is suggested which can be easily used in the engineering software. A case study showed that though this type of joint can be utilized in the structure that is dominated by global stability, yet the limited joint stiffness must be taken into account in the nonlinear analysis.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2004年第3期1-7,共7页
Journal of Building Structures
基金
上海市重点学科建设资助项目
关键词
矩形钢管
钢管结构
贯通式节点
抗弯性能
弯曲试验
steel tubular structure
through-type tubular joint
bending properties
experimental research
