结构用共挤木塑复合材承压性能研究  

Bearing Performance of Co-Extruded Wood-Plastic Composites for Structural Application

作　　者：李俞谕 侯剑山 何文辉[2] 程少杰 杨俊成 欧荣贤[3] 丛沛桐[1] LI Yuyu;HOU Jianshan;HE Wenhui;CHENG Shaojie;YANG Juncheng;OU Rongxian;CONG Peitong(College of Water Conservancy and Civil Engineering,South China Agricultural University,Guangzhou 510642,Guangdong,China;State Key Laboratory of Subtropical Building and Urban Science,South China University of Technology,Guangzhou 510642,Guangdong,China;Institute of Biomass Engineering,Key Laboratory of Energy Plants Resource and Utilization(Ministry of Agriculture and Rural Affairs),South China Agricultural University,Guangzhou 510642,Guangdong,China)

机构地区：[1]华南农业大学水利与土木学院,广东广州510642 [2]华南理工大学亚热带建筑与城市科学全国重点实验室,广东广州510642 [3]华南农业大学生物质工程研究院,农业农村部能源植物资源与利用重点实验室,广东广州510642

出　　处：《木材科学与技术》2024年第5期57-67,共11页Chinese Journal of Wood Science and Technology

基　　金：广东省重点领域研发计划项目“再生低碳生态建筑材料研究与部品开发”(2020B0202010008);广东省林业局林业科研重点项目“装配式竹塑复合结构关键技术及其应用”(2024KJQT001)。

摘　　要：以聚氯乙烯(polyvinyl chloride,PVC)基木塑复合材料与丙烯腈-苯乙烯共聚物为原料,采用共挤出成型工艺制备结构用共挤木塑复合材料(co-extruded wood-plastic composites,Co-WPC)。为推进Co-WPC在网壳结构领域的应用,以螺栓直径和加载方向为参数,对Co-WPC进行全孔承压试验,并对承压模型进行有限元分析。随着螺栓直径的增大,Co-WPC的承压强度下降,螺栓直径为10 mm时,Co-WPC的承压强度达到最小值(39.0 MPa);在螺栓直径相同的情况下,试件在垂直于挤出方向加载的承压强度大于平行方向加载,模拟与试验的承压强度相对误差控制在15%以内,模拟荷载-位移曲线与试验曲线吻合良好;根据各国现行木材设计标准和试验数据,提出Co-WPC的承压强度计算公式,相对误差控制在10%以内,较好地预测了Co-WPC的承压强度。Structural co-extruded wood-plastic composites(Co-WPC)were prepared using PVC-based wood-plastic composites and acrylonitrile-styrene copolymer(AS)engineering plastics as raw materials,made through a co-extrusion molding process.To promote the application of Co-WPC in the field of reticulated shell structures,bearing tests under full bolt-hole loading were conducted on the Co-WPC,with bolt diameter and loading direction as variables.The bearing model was analyzed using finite element analysis.The results showed that as the bolt diameter increased,the bearing strength decreased.It reached a minimum value of 39.0 MPa at a bolt diameter of 10 mm.For the same bolt diameter,the bearing strength of specimens loaded perpendicular to the extrusion direction was greater than that of those loaded parallel to the extrusion direction.The relative error between the simulated and experimental bearing strengths is controlled within 15%.The simulated load-displacement curves correlated well with the experimental curves.Based on current wood design standards from various countries and the experimental data,a formula for calculating the bearing strength of Co-WPC was proposed.The formula accurately predicted the bearing strength,with a relative error within 10%.

关 键 词：结构用木塑复合材料 承压强度 孔周材性调整 有限元分析 

分 类 号：TU531[建筑科学—建筑技术科学] S795.9[农业科学—林木遗传育种]