木混组合梁微切口连接处的抗剪性能研究  

Study on the shear properties of micro-notch joints of wood-concrete composite beams

作　　者：金苞蕾 鹿相戎 韩聪 王硕 阙泽利 JIN Baolei;LU Xiangrong;HAN Cong;WANG Shuo;QUE Zeli(College of Materials Science and Engineering,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]南京林业大学材料科学与工程学院,南京210037

出　　处：《林业工程学报》2025年第2期180-186,共7页Journal of Forestry Engineering

基　　金：江苏省研究生科研与实践创新计划(KYCX22-1080)。

摘　　要：微切口作为一种新型剪力连接形式,结合了中国古建筑中榫卯结构与混凝土结构的优势,取长补短,为木材与混凝土的连接提供了一个新的备选方案。为探究木混组合梁微切口连接件的抗剪性能,设计并制作了不同角度和深度微切口连接的木混组合构件,通过推出试验检测微切口的抗剪承载力、抗剪刚度和抗剪强度,统计分析在纯剪、拉剪和压剪状态下微切口角度和深度对抗剪性能的影响,从而获得较优的微切口深度与角度组合。最后建立了微切口连接木混组合构件抗剪强度理论公式并进行验证,理论值与实际值吻合良好。研究表明,微切口承受压剪复合应力时抗剪性能更优越,而拉剪复合应力下的性能较差,建议在实际工程应用中尽量避免微切口处承受拉剪复合应力;压剪45°、15 mm深度的微切口抗剪承载力达到14.20 kN,抗剪刚度为8.43 kN/mm,抗剪强度为11.83 MPa,具有较强的弹性变形能力,综合抗剪性能优异。本研究为木混组合结构的设计与优化提供了试验依据,为木材和混凝土组合结构在现代建筑中的推广应用奠定了基础。As an innovative shear connection method,the micro-notch combines the advantages of traditional mortise-and-tenon joints and the concrete structures used in ancient Chinese architecture.It provides a novel solution for effectively connecting wood and concrete components in composite structures.Traditional metal connectors,while commonly used,often increase the weight of the structure and introduce potential issues such as corrosion,which can compromise durability over time.The micro-notch connection,however,utilizes precisely cut notches to improve bonding strength and energy absorption,providing a lighter,more durable alternative that is also aesthetically aligned with natural wood elements.This study investigated the shear performance of micro-notch connectors specifically in wood-concrete composite beams.To this end,composite specimens with micro-notches of varying angles and depths were designed and fabricated to assess performance across multiple configurations.Key parameters,including shear bearing capacity,shear stiffness,and shear strength of these micro-notches,were evaluated through push tests to determine how effectively they could withstand different types of loading conditions.The effects of micro-notch angles and depths on shear properties were statistically analyzed under pure shear,tensile shear,and compressive shear conditions,aiming at identifying the optimal combinations of micro-notch depth and angle for different applications.Furthermore,a theoretical model was developed to predict the shear strength of wood-concrete composite components connected by micro-notches.This model was validated by comparing its theoretical values with experimental results,revealing a close correlation between the predicted and observed outcomes.This alignment underscored the reliability of the theoretical model for predicting performance in practical applications.The research indicated that micro-notch shear performance was most robust under combined compression and shear stress,exhibiting a high level of resistanc

关 键 词：微切口 胶合木 木混组合梁 抗剪性能 

分 类 号：TU398.9[建筑科学—结构工程]