四肢规格材格构柱轴心受压性能试验  

Research on axial compression performance of 4-leg standard lumber lattice columns

作　　者：杜姚姚 张苏俊[1,2] 朱旭东 张文娟 DU Yaoyao;ZHANG Sujun;ZHU Xudong;ZHANG Wenjuan(Architectural Engineering Institute,Yangzhou Polytechnic Institute,Yangzhou 225127,China;College of Civil Science and Engineering,Yangzhou University,Yangzhou 225100,China)

机构地区：[1]扬州工业职业技术学院建筑工程学院,扬州225127 [2]扬州大学建筑科学与工程学院,扬州225100

出　　处：《林业工程学报》2022年第3期158-165,共8页Journal of Forestry Engineering

基　　金：国家自然科学基金(31901252);江苏省基础研究计划(自然科学基金)(BK20180276);江苏省高等学校自然科学研究项目(18KJB220012);江苏省住建厅科技项目(2018ZD119);扬州市国际合作项目(YZ2020203)。

摘　　要：传统木结构建筑的原材料主要是原木和锯材,严重依赖于大量的天然林木资源。木材不仅存在天然的缺陷,其尺寸也不能满足施工建筑的要求且面临运输和现场安装等困难,这些问题很大程度上限制了传统木结构建筑的应用和发展。为了提高木材利用率,实现现代化装配式的要求,提出了一种SPF规格材格构柱代替传统的实心木柱作为结构承重构件。对3组共9个四肢规格材格构柱进行轴心受压试验,研究了轴向和弱轴柱中的荷载-位移曲线、柱跨中的荷载-应变曲线,分析了格构柱的破坏形态、变形和稳定承载力。结合试验结果与理论推导,对规格材格构柱的稳定系数进行修正,提出了规格材格构柱稳定系数经验计算公式。通过ABAQUS软件建立有限元模型并进行数值模拟,与试验结果进行对比分析,验证数值模拟的准确性。研究结果表明:该类SPF规格材格构柱在轴心荷载作用下的破坏形态分为整体失稳破坏和单肢失稳破坏,局部沿顺纹方向、木节和节点处产生裂纹以及柱端压溃破坏,并得出格构柱单肢长细比越大,轴向位移和柱中侧向位移越大,极限应变也越大,极限承载力随着单肢长细比的增大而降低的结论。上述试验研究与理论分析为规格材格构柱在实际工程中的应用提供设计参考和理论依据。The raw materials of traditional wooden structure are mainly logs and converted timber,which depend heavily on a large number of natural forest resources.Since wood has natural defects,its natural shape and size cannot meet the requirements of construction,transportation,and site installation,which have seriously limited the development and application for traditional wooden structures.In order to improve the utilization rate of wood and meet the requirements of modern assembly,this study proposes a type of Spruce-Pine-Fir(SPF) dimension lumber lattice columns to replace the traditional solid wood columns as the structural load-bearing member.In this study,the axial compression tests of three groups of nine 4-leg standard lumber lattice columns were carried out,load-displacement curves of axial and weak axis column midpoint and load-deformation curves of column midpoint were investigated,and the failure modes,deformation and stability bearing capacity of the lattice columns were analyzed.Based on the test results and theoretical deduction,the stability factor of the grillage columns was modified,and the empirical formula of the stability factor was proposed.The finite element model was established using the ABAQUS software.The numerical simulation was carried out,and the calculated results were compared with the experimental results to verify the accuracy of the numerical simulation.Results showed that the failure pattern of this SPF lattice column under axial load can be divided into integral failure and single limb failure,cracks occurred locally along the grain direction,and knots,joints,and column end crushed.It was found that the greater the slenderness ratio of a single limb,the greater the axial displacement and the lateral displacement in the column and the ultimate strain;the ultimate bearing capacity decreased with the increase in slenderness ratio of a single limb.The above experimental research and theoretical analysis provide design reference and theoretical basis for the applications of the specific

关 键 词：SPF规格材 格构柱 轴心受压 承载力 有限元分析 

分 类 号：TU223[建筑科学—建筑设计及理论]