(1 南京工业大学土木工程学院， 南京 210018； 2 河海大学土木工程学院， 南京 210012)

［摘要］开展圆钢管T形相贯节点平面内抗弯承载力试验研究，考察T形相贯节点的抗弯承载力特性、破坏模式和计算理论。试验结果表明，T形相贯节点的破坏模式为局部屈曲破坏，随着荷载增加，节点区域主管中间位置应变发展最快，首先进入塑性并发生局部屈曲失效；继续加载后，焊缝产生撕裂破坏。对T形相贯节点进行非线性有限元模拟以研究其抗弯承载力特性，分析得到的节点荷载位移曲线与试验结果吻合较好；节点发生局部屈曲失效，与试验破坏模式相一致。最后，分析了两个无量纲化几何特征参数对节点抗弯承载力的影响，并提出了节点抗弯承载力计算公式。

［关键词］圆钢管T形相贯节点； 平面内抗弯承载力； 局部屈曲

中图分类号：TU392文献标识码：A文章编号：1002-848X(2017)02-0023-05

Experimental and calculation theoretical study on in-plane flexural bearing capacity of  circular steel tubular T-shaped connection joints

Li Chen1, Zhang Dachang1, Li Buhui2

(1 College of Civil Engineering, Nanjing Tech University, Nanjing 210018, China；

2 College of Civil and Transportation Engineering, Hohai University, Nanjing 210012, China)

Abstract:Experimental studies on in-plane flexural bearing capacity of circular steel tubular T-shaped connection joints were carried out to investigate the flexural load bearing characteristics, failure mode and computing theory of circular steel tubular T-shaped connection joints. Tests results show that the failure mode of steel tubular T-shaped connection joints is local buckling. The strain along the middle position of main tube has fastest growth with the increase of load, and it first appears plasticity and local buckling. After continued loading, tearing failure occurs on the weld seam. Besides, the nonlinear finite element simulation on T-shaped connection joints was carried out to study flexural bearing capacity characteristics, and the obtained joint load-curves has good agreement with test results. The local buckling failure for joints is consistent with test failure mode. Finally, influences of two dimensionless geometric characteristic parameters on joint flexural bearing capacity were analyzed and the corresponding calculation formula of joint flexural bearing capacity was developed.

Keywords:circular steel tublar T-shaped connection joint; in-plane flexural bearing capacity; local buckling

*江苏省2013年“六大人才高峰”项目。

作者简介：李晨，硕士， Email: lichenwwj17@163.com。