大跨度竹质方梁的制备与抗弯性能研究  

Study on the preparation and bending properties of laminated bamboo block for long span

作　　者：彭亮[1] 黄汉霄 孙晓东[1] PENG Liang;HUANG Hanxiao;SUN Xiaodong(Hunan Academy of Forestry,Changsha 410004,China;School of Materials Science and Engineering,Central South University of Forestry&Technology,Changsha 410004,China)

机构地区：[1]湖南省林业科学院,湖南长沙410004 [2]中南林业科技大学材料科学与工程学院,湖南长沙410004

出　　处：《湖南林业科技》2020年第1期81-85,共5页Hunan Forestry Science & Technology

基　　金：湖南省重点研发计划“湖南竹资源高效培育与产业链增值关键技术研究与示范”(2016NK2144);“竹单板与泡沫铝夹芯复合功能型材料制造技术研究”(2017NK2241);湖南林业科技计划项目“功能性改良竹单板与泡沫金属材料复合制造技术研究”(XLK201711)

摘　　要：为了探究木质材料在大型建筑应用的可行性,以竹材为原料,利用层积热压组坯的方式制备长度为3 m和6 m的竹质方梁,对其进行四点抗弯测试,观察其在测试过程中的弯曲变形及破坏特征,分析弹性模量、静曲强度,根据其破坏形式分析竹质方梁结构及组坯方式对其抗弯性能的影响。结果表明:6 m竹质方梁弹性模量达10261.24 MPa,跨中竖向位移至86.97 mm而不破坏;3 m竹质方梁静曲强度达85.51 MPa。竹质方梁破坏均出现在弯曲的受拉面,且裂纹通过竹节处、胶合界面以及竹纤维排布方向蔓延,这与竹材本身结构特性有关。通过对3 m和6 m竹质方梁抗弯实验及分析,以期为竹质方梁在大跨度下的应用提供数据支撑。In order to research the feasibility of bamboo materials in large buildings,a laminated bamboo block with length of 3 m and 6 m was prepared using a method of hot die casting billets by lamination and taking bamboo as raw materials,and a four points bending test was conducted to measure the bending performance of laminated bamboo block,observe the bending deformation and failure characteristics during test,know about the elastic modulus and static bending strength and analyze the effect of structure and billet assembly mode on bending properties.The results showed that no failure in laminated bamboo block with length of 6 m at vertical displacement of 86.97 mm,and the elastic modulus was 10261.24 MPa.The static bending strength with length of 3 m was 85.51 MPa.Moreover,the failure was observed in tension interface,and the crack appeared in the tension interface during bending and spread through the bamboo joint,finger joint and arrangement direction of bamboo fiber.These behaviors were mainly related to the structural characteristics of bamboo itself.It was expected to provide data support for the application it in large span by the bending test and analysis of 3 m and 6 m laminated bamboo block.

关 键 词：毛竹 竹质方梁 抗弯性能 

分 类 号：TS612[轻工技术与工程] S781.3[农业科学—木材科学与技术]