不同构型集成竹格栅夹芯板抗弯性能  

Bending performance of laminated bamboo sandwich panels with different lattice configurations

作　　者：王智丰[1,2] 周李承 Wang Zhifeng;Zhou Licheng(School of Civil Engineering,Central South University of Forestry&Technology,Changsha 410004,Hunan,China;Hunan Engineering Laboratory for Manufacturing and Application Technology of Modern Timber Structure Engineering Material,Central South University of Forestry&Technology,Changsha 410004,Hunan,China)

机构地区：[1]中南林业科技大学土木工程学院,湖南长沙410004 [2]中南林业科技大学现代木结构工程材制造及应用技术湖南省工程实验室,湖南长沙410004

出　　处：《北京林业大学学报》2025年第1期147-155,共9页Journal of Beijing Forestry University

基　　金：国家自然科学基金面上项目(32471984),湖南省自然科学基金面上项目(2024JJ5631);湖南省教育厅优青项目(23B0236);湖南省研究生科研创新项目(QL20230192);中南林业科技大学引进人才项目(2019YJ048)。

摘　　要：【目的】针对集成竹利用效率不高,使用形式较为单一的问题,探索其轻质、高效特性的先进结构形式,这对推动竹材在工程领域的应用方面具有重要意义。本研究旨在探究不同构型格栅芯体对集成竹格栅夹芯板弯曲性能的影响,选出不同格栅构型中抗弯性能最优的结构,为其在实际工程的应用提供理论依据。【方法】以集成竹为原材料,通过嵌锁法分别设计加工3种具有不同构型(三角形格栅、方形格栅和Kagome形格栅)的集成竹格栅夹芯板。对不同格栅芯体的集成竹格栅夹芯板进行四点弯曲试验,探讨夹芯板结构的受弯性能,分析夹芯板结构在受弯荷载下的破坏机理、跨中挠度、抗弯刚度和极限承载力的变化规律,并对3种不同芯体集成竹格栅夹芯板结构的比强度和比刚度进行对比。同时,采用有限元方法建立集成竹格栅夹芯板四点弯曲试验模型,并进行数值模拟分析。【结果】3种不同构型格栅芯体的集成竹格栅夹芯板结构在受弯加载过程中均表现为剪切破坏。三角形集成竹格栅夹芯板的承载能力最好,三角形和Kagome形格栅极限承载力分别为38.7和27.5 kN,较极限承载力22.5 kN的方形格栅增加了71.9%和22.2%;同时三角形集成竹格栅夹芯板的比强度为133.5 kN·m/kg,较方形(94.6 kN·m/kg)和Kagome形(96.7 kN·m/kg)分别提高了41.2%和38.1%。有限元模型的模拟结果与试验结果较一致,能有效预测集成竹格栅夹芯板的弯曲性能。【结论】3种格栅构型中三角形集成竹夹芯板弯曲性能最优,能够更好地发挥集成竹轻质高强的性能优势。研究结果可为竹材在工程领域的应用提供一种高效的结构形式及理论依据。[Objective]Integrated bamboo has low utilization efficiency and is used in a rather limited variety of forms in engineering applications.So exploring advanced structural forms that integrate the lightweight and high-efficiency characteristics of bamboo is of great significance in promoting the application of bamboo in the field of engineering.This study aims to investigate the impact of different lattice configurations on bending performance of laminated bamboo sandwich panels,select the structure with the best bending resistance among various lattice configurations,and provide a theoretical basis for its application in practical engineering.[Method]Three kinds of laminated bamboo sandwich panels with different lattice cores,namely triangular lattice,square lattice and Kagome lattice,were designed and processed with laminated bamboo as raw material by interlocking method in this study.A four-point bending test was carried out on laminated bamboo sandwich panels with different lattice cores,and the bending performance of sandwich panels was discussed.The failure mechanism of sandwich panels under bending load,as well as the variation law of mid-span deflection,bending stiffness and ultimate bearing capacity,were analyzed,and the specific strength and specific stiffness of laminated bamboo sandwich panels with three different core layers were compared.At the same time,a four-point bending test model of laminated bamboo sandwich panels was established by finite element method,and numerical simulation was carried out.[Result]Three kinds of sandwich panels with different lattice cores all showed shear failure during the bending loading,among which the triangular lattice sandwich panel had the best bearing capacity.Compared with square lattice sandwich panel with ultimate bearing capacity of 22.5 kN,the ultimate bearing capacity of sandwich panels with triangular lattice and Kagome lattice was 38.7 and 27.5 kN,increased by 71.9%and 22.2%,respectively.The specific strength of laminated bamboo sandwich panel with triangu

关 键 词：结构板材 有限元法 失效模式 弯曲强度 集成竹夹芯板 格栅构型 

分 类 号：S781.9[农业科学—木材科学与技术]