矩形管-圆管T形节点轴压承载力试验研究

发布时间：2018-03-19 15:44

本文选题：钢管结构　切入点：T形节点　出处：《土木工程学报》2014年11期 　论文类型：期刊论文

【摘要】：我国现行钢结构设计规范中没有对腹杆(支管)为矩形管、弦杆(主管)为圆管的节点(支方主圆节点)强度计算公式。EC3规范、CIDECT指南等虽给出了支方主圆节点承载力的计算公式,但与腹杆为H形截面的节点(支H主圆节点)承载力计算公式采用了完全相同的形式,其合理性有待验证。对4个轴压T形节点试件进行试验研究并进行了有限元分析。发现支方主圆的T形节点以纵向板传力为主,支H主圆的T形节点以横向板传力为主;支管截面外包尺寸相同时,前者的承载力会不同程度大于后者。将试验结果与EC3、CIDECT的承载力计算公式进行对比,发现公式低估了腹杆纵向板相对宽度对承载力的影响。通过有限元分析,对试件弦杆采用不同边界条件的试验结果进行可比性研究,提出比较不同试验结果的"等效长径比"概念。
[Abstract]:In the current steel structure design code of our country, there is no rectangular tube for web rod (branch pipe). The formula for calculating the strength of the joints of circular tubes. EC3 Code and CIDECT's Guide, etc., have given the formulas for calculating the bearing capacity of the supporting main circular joints. However, the formula for calculating the bearing capacity of joints with H-shaped section of web members (supported H-ring joints) is exactly the same. The rationality needs to be verified. Four specimens of axial compression T-joint are tested and analyzed by finite element method. It is found that longitudinal plate is the main force transfer in T-shaped joint of supporting main circle and transverse plate is dominant in T-joint of supporting H-circle. The bearing capacity of the former will be greater than that of the latter in different degree when the outlay size of the branch section is the same. The test results are compared with the calculation formula of the bearing capacity of EC3 CIDECT. It is found that the formula underestimates the influence of the relative width of the webs longitudinal plate on the bearing capacity. Through the finite element analysis, the comparability of the test results with different boundary conditions is studied. The concept of "equivalent aspect ratio" is proposed to compare different test results.
【作者单位】：同济大学;
【基金】：《钢结构设计规范》国家标准管理组科研专项课题(GB500172010-06)
【分类号】：TU392.3

【共引文献】