林业工程学报2025，Vol.10Issue(2)：180-186,7.DOI:10.13360/j.issn.2096-1359.202404032
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
摘要
Abstract
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 resistance and elastic deformation capacity.However,the performance was relatively poor under combined tensile and shear stress,suggesting that tensile-shear stress should be minimized or avoided in practical engineering applications to enhance durability.Specifically,under the optimal condition of a 45° angle and a 15 mm depth micro-notch,the shear bearing capacity reached 14.20 kN,the shear stiffness was 8.43 kN/mm,and the shear strength was 11.83 MPa,demonstrating superior overall shear performance.This study offers valuable experimental evidence for the design and optimization of timber-concrete composite structures.By laying the groundwork for micro-notch applications in modern construction,it supports the advancement of wood-concrete composite structures as a sustainable,high-performance,and practical building solution.关键词
微切口/胶合木/木混组合梁/抗剪性能Key words
micro-notch/glulam/timber-concrete composite beam/shear resistance分类
建筑与水利引用本文复制引用
金苞蕾,鹿相戎,韩聪,王硕,阙泽利..木混组合梁微切口连接处的抗剪性能研究[J].林业工程学报,2025,10(2):180-186,7.基金项目
江苏省研究生科研与实践创新计划(KYCX22-1080). （KYCX22-1080）
