（1 无锡太湖学院土木工程学院， 无锡 214064； 2 南京工业大学土木工程学院， 南京 211816）

［摘要］作为一种新型的组合构件，木-混凝土组合梁具有良好的力学性能。螺钉连接件施工简便、成本较低，并且具有较好的延性，被广泛地应用于木-混凝土组合体系中。通过4组推出试验对木-混凝土组合梁螺钉连接件的抗剪性能进行研究，重点分析了混凝土种类和螺钉直径对螺钉连接件受力性能的影响。结果表明：使用轻骨料混凝土代替普通混凝土对螺钉连接件的受力性能没有明显影响；随着螺钉直径的增大，连接件的承载能力和刚度显著提高。在对螺钉的实际受力状态进行分析的基础上，建立了木-混凝土组合梁螺钉连接件抗剪承载力的理论计算模型。与欧洲规范中螺钉连接件的计算公式相比，新建立的计算模型可以更为准确地预测木-混凝土组合梁螺钉连接件的抗剪承载力。

［关键词］木-混凝土组合梁；螺钉连接件；推出试验；抗剪承载力

中图分类号：TU398-6文献标识码：A文章编号：1002-848X(2021)04-0114-05

Study on the mechanical behavior and calculation methods of the screw connector for timber-concrete composite beams

JIANG Yuchen1, HU Xiamin2

(1 College of Civil Engineering, Taihu University of Wuxi, Wuxi 214064, China；2 College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China)

Abstract:As a new type of composite component, the timber-concrete composite (TCC) beam has excellent mechanical performance. The screw connector is widely used in TCC systems as a result of its construction convenience, low erection cost and good ductility. Four groups of push-out tests were conducted to investigate the shear performance of timber-concrete composite beam screw connectors, considering the influence of the varying concrete type and screw diameter on the mechanical performance of screw connector. The results show that using lightweight concrete instead of normal concrete has no obvious influence on the mechanical performance of screw connectors. As the diameter of the screw increases, the bearing capacity and stiffness of screw connectors increase apparently. On the basis of analyzing the actual stress state of the screw, the calculation model for the shear capacity of timber-concrete composite beam screw connections was established. By comparison with the calculation formulas for screw connectors proposed in Eurocode, the new-established calculation model can make better prediction of the shear capacity of timber-concrete composite beam screw connectors.

Keywords:timber-concrete composite beam;screw connectors;push-out test;shear capacity

*国家自然科学基金项目（51478220）,江苏省高校自然科学基金项目（19KJB560022）。

作者简介：江雨辰，博士，讲师，Email：superjyc@hotmail.com;通信作者：胡夏闽，硕士，教授，Email：huxm_njtech@163.com。