不同构造尺寸下山毛榉木榫旋转焊接SPF基材连接节点的抗剪性能  

Shear performance of beech dowel rotary welded SPF substrate joints with different structure dimensions

作　　者：马瑞煜 王宁 高颖[1] 孟鑫淼 朱旭东 杨娟 Ma Ruiyu;Wang Ning;Gao Ying;Meng Xinmiao;Zhu Xudong;Yang Juan(School of Materials Science and Technology,Beijing Forestry University,Beijing 100083,China;School of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;School of Architectural Engineering,Yangzhou Polytechnic Institute,Yangzhou 225100,Jiangsu,China)

机构地区：[1]北京林业大学材料科学与技术学院,北京100083 [2]北京林业大学水土保持学院,北京100083 [3]扬州工业职业技术学院建筑工程学院,江苏扬州225100

出　　处：《北京林业大学学报》2024年第5期143-153,共11页Journal of Beijing Forestry University

基　　金：北京林业大学“北京市大学生科学研究与创业行动计划”(S202210022106);青年科学基金项目(31901252)。

摘　　要：【目的】为明确构造尺寸对木榫旋转焊接节点抗剪性能的影响,并初步探究节点的群栓组合效应。【方法】采用山毛榉木榫旋转焊接SPF(spruce-pine-fir)基材,通过单剪试验,首先研究了端距、间距和行距对节点抗剪承载性能的影响规律,其次研究了不同直径下的单木榫和双木榫连接节点的抗剪承载性能。【结果】节点的抗剪承载性能主要取决于端距和间距,行距的影响较小。木榫剪切是最主要的节点破坏模式,但当端距≤4d(d为焊接后木榫直径)、间距≤3d时,基材发生了块剪和开裂,承载力大幅降低。随着端距、间距和行距尺寸的增大,节点的峰值荷载先增大后减小。当端距6d、间距5d、行距3d时,木榫旋转焊接节点的抗剪承载性能最优,其峰值荷载分别为3.36、6.68、6.97 kN。木榫旋转焊接连接节点中会存在明显的群栓组合效应,随着木榫直径的增加,节点的群栓组合系数呈现先减小后增大的趋势,当木榫直径≤10 mm时,群栓组合系数大于1.00。【结论】当选用山毛榉木榫旋转焊接SPF基材时,为保证节点的抗剪性能,节点的端距应不小于5d,间距应不小于4d,行距应不小于2d。推荐节点设计时参考端距6d、间距5d、行距3d。木榫旋转焊接节点的群栓组合系数受直径的影响明显,直径范围8~10 mm节点的群栓组合系数更大。[Objective]This study aims to clarify the influence of structure dimensions on the shear performance of wood dowel rotary welding joints and explore group effect of the joints.[Method]This paper investigates the influence of end distance,spacing distance and row distance on the shear performance of joints using a beech(Fagus sylvatic)dowel rotary welded SPF(spruce-pine-fir)substrate in a single shear test,and the shear performance of single dowel and double dowel joints with different diameters.[Result]Shear performance of joints is mainly dependent on the end distance and spacing distance,with the influence of row distance being small.The dominant failure mode was wood dowel shear.However,when the end distance was less than or equal to 4d(d is the wood dowel diameter after welding)and spacing was less than or equal to 3d,block shear and cracking occurred in the substrate,substantially reducing the shear performance.The joint peak load increased first and then decreased as the end distance,spacing distance,and row distance dimensions increased.When the end distance was 6d and the spacing was 5d,the optimal shear performance of the dowel rotary welding joint was achieved with a row spacing of 3d.The peak load was 3.36,6.68,and 6.97 kN,respectively.The dowel rotary welding joint exhibited an obvious group effect,with the combination coefficient of group effect showing a trend of decreasing and then increasing with the increase of wood dowel diameter.When the diameter of the dowel was less than or equal to 10 mm,the combination coefficient of group effect was greater than 1.00.[Conclusion]To ensure the shear performance of the joints,the joints should have an end distance not less than 5d,a spacing distance not less than 4d,and a row distance not less than 2d.The recommended end distance for joint design reference is 6d,with a spacing distance of 5d and a row distance of 3d.The joint combination coefficient of group effect of dowel rotary welding is influenced by the diameter,with a diameter range of 8−10 mm resul

关 键 词：木榫 旋转焊接 抗剪性能 构造尺寸 群组效应 

分 类 号：S781[农业科学—木材科学与技术] TU366.2[农业科学—林学]