（1 长安大学建筑工程学院， 西安 710061； 2 长安大学公路学院， 西安 710064）

［摘要］在外方内圆复式钢管混凝土柱-H型钢梁节点拟静力试验研究基础上，建立了组合节点的非线性有限元模型，研究了组合节点的滞回曲线、骨架曲线和破坏形态，分析了节点核心区水平端板、锚固腹板、竖向肋板以及内外钢管的应力分布，探讨了此类组合节点的传力机制。结果表明，建立的非线性有限元模型能较好地反映组合节点在低周往复荷载作用下的力学性能，节点核心区的应力较大值出现在水平端板变截面处和锚固腹板加肋处，钢梁翼缘的应力通过水平端板传递给锚固腹板和竖向肋板，竖向肋板的应力进一步传递给外方钢管柱腹板，而锚固腹板的应力则传递给内外钢管柱翼缘以及钢管内混凝土中，且锚固腹板与竖向肋板表现出很好的协同工作性能。试验及有限元分析均表明此类新型组合节点抗震性能较好、应力分布合理、传力路径清晰，可用于抗震设防区的建筑中。

［关键词］复式钢管混凝土柱-钢梁节点； 滞回曲线； 骨架曲线； 破坏形态； 应力分布； 传力机制

中图分类号：TU398-9文献标识码：A文章编号：1002-848X(2018)15-0037-07

Stress distribution and force-transferring mechanism of connections between concrete-filled double steel tubular column and steel beam

Zhang Dongfang1, Zhao Junhai1, He Shuanhai2, Zhu Qian1

(1 School of Civil Engineering, Chang′an University, Xi′an 710061, China;2 Highway School, Chang′an University, Xi′an 710064, China)

Abstract:A nonlinear finite element analysis was carried out to simulate the behaviour of the specimens based on the experimental research on the connections between concrete-filled double steel tubular (CFDST) column and steel beam. The hysteretic behaviour, skeleton curves, failure modes of the composite connections were analyzed. The stress distribution of the horizontal end plate, the anchorage plate, the vertical stiffeners, the inner and outer steel tubes were also discussed. Then the force-transferring mechanism of the composite connections were investigated.  The results show that the finite element model can better reflect the mechanical properties of the composite connections under low cycle loads. The high stress appears at the variable cross-section of the horizontal end plate and at the rib of the anchorage plate. The stress at the flange of steel beams is transmitted to the anchorage plate and the vertical stiffeners through the horizontal end plate. And then, the stress of the vertical stiffeners is transferred to the web of the outer steel tube. At the meanwhile, the stress of the anchorage plate is transmitted to the flanges of the inner and outer steel tubes and the concrete. Above all, the anchorage plate and the vertical stiffeners show favourable cooperative performance. The new types of composite connections have better seismic behaviour and excellent force-transferring mechanism, which can be used in the construction of antiearthquake fortification zone.

Keywords:connections between CFDST column and steel beam; hysteretic curves; skeleton curves; failure modes; stress distribution; force-transferring mechanism

*国家自然科学基金项目（51508028），中国博士后科学基金项目（2014M562357，2015M580803），陕西省自然科学基金（2018JQ5119），陕西省博士后科研项目，中央高校基本科研业务费专项资金资助（300102288112，310828173402）。

作者简介：张冬芳，博士，讲师，Email: zhangdongfang_2008@163.com。