(1 凯里学院建筑工程学院， 贵州 556011；2 江苏科技大学土木工程与建筑学院， 镇江 212003)

［摘要］西南木结构民居的节点主要采用带销钉的直榫连接，明销直榫连接是其中最常用的连接方式之一。为了研究明销直榫节点的力学性能，设计了8个足尺明销钉直榫节点和2个无销钉直榫节点，并进行抗弯的单调加载试验，得到不同类型节点的弯矩转角曲线以及拔榫量-转角曲线，探讨销钉形状、位置对直榫节点性能的影响。研究表明：明销直榫节点在单向加载的情况下，其弯矩转角曲线大致分为弹性受力阶段和塑性发展阶段，节点的失效原因主要是木材强度的破坏导致其变形过大而失去承载力；销钉对直榫节点有一定约束作用，能提高直榫节点的力学性能，降低其拔榫量；方形销钉对直榫节点约束性更强，销钉的位置对直榫节点影响较小。 

［关键词］木结构；明销直榫节点；单向加载；力学性能 

中图分类号：TU366-2 文献标识码：A文章编号：1002-848X(2021)21-0136-06

Research on mechanical performance of straight mortise-tenon joints with exposed dowels under uniaxial loading 

WANG  Zhanguang1,  LIU  Renyuan1,  SHI  Ang2,  WANG  Tingting2,  SHAO  Jianhua2 

(1 Architectural and Civil Engineering Institute, Kaili University, Guizhou 556011， China；2 School of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212003， China) 

Abstract:Traditional dwellings in Southwest China are mainly made of timber structures with tenon-and-mortise joints, straight mortise-tenon with exposed dowels is one of the most commonly used connection methods. In order to study the mechanical performances of straight mortise-tenon joints with exposed dowels, eight full-scale straight mortise-tenon joints with exposed dowels and two full-scale straight mortise-tenon joints were designed for monotone loading test of bending, the moment-rotation curves and pullout tenon-rotation curves of different type joints were obtained. The influence of dowel shape and position on the performance of straight mortise-tenon joints were discussed. Research results show that the moment-rotation curve of the straight mortise-tenon joints with exposed dowels can be divided into the elastic stress stage and the plastic development stage under uniaxial loading. The failure of the joint is mainly due to the failure of wood strength, which leads to excessive deformation and loss of bearing capacity. The dowels can restrain the straight mortise-tenon joints to a certain extent, which can improve the mechanical preformance and reduce the amount of tenon pullout; the square dowel is more restrictive to the straight mortise-tenon joint, and the position of the dowel has little effect on straight mortise-tenon joints. 

Keywords:wood structure； straight mortise-tenon joint with exposed dowel； uniaxial loading； mechanical preformance

*贵州省教育厅创新群体重大研究项目(黔教合KY字［2017］048)，贵州省科技计划项目(黔科合LH字［2019］1288号)，凯里学院十四五一流学科“土木工程”。

 作者简介：王展光，博士，Email:wzg3262396@163.com； 通信作者：邵建华，博士，教授，Email:shaojianhua97@163.com。