结构用单板层积材的斜纹承压力学性能.pdf

第17卷第1期建筑材料学报Val, 17, No. 12014年2月JOURNAL OF BUILDING MATERIALSFeb.;2014文章编号:1007-9629(2014)01-0115-05结构用单板层积材的斜纹承压力学性能钟永,邢新婷,任海青,张冉(中国林业科学研究院木材工业研究所,北京100091)摘要:为了研究纹理角度对结构用单板层积材(LVL)承压力学性能的影响,进行了180个不同纹理角度试件的承压测试,结果表明:随着纹理角度的增加,试件的斜纹承压强度和刚度均明显下降;斜纹承压共发生纤维的褶皱破坏、剪切破坏和横纹受压破坏3种破坏模式.将GB50005-2003木结构设计规范中的斜纹承压公式与国外常用 Hankinson计算公式、 Norris强度准则进行分析比較后发现, Hankinson计算公式能够更好地预测LVL的斜纹承压强度值;在同时考虑斜纹承压破坏模式的前提下,采用最大应力强度准则亦能较好地预测LVL的斜纹承压强度关键词:斜纹承压;单板层积材;承压强度;刚度;强度准则中图分类号:TS653.3文献标志码:Adoi:10.3969/j.issn.1007-9629.2014.01.021Properties of Structural Laminated Veneer Lumber inCompression at an Angle to GrainZHONG Yong, XING Xinting, REN Haiqing, ZHANG Ran(Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China)Abstract: In order to study the effect of angle between load and wood grain on the compressive strengthstiffness and failure mode for structural laminated veneer lumber(LVL), a total of 180 samples were testedin static compression under various angle. The results show that the compressive strength and stiffness areSignificantd with the increase of angle. There are three kinds of failure modes in compressivetest, that is, wood fiber folding failure, shearing failure and crushing failure. By comparison of the calcu-ation formula in Chinese standard GB 50005-2003 with Hankinsion formula and Norris criterion as thestrength criterion for structural laminated veneer lumber, it is found that Hankinsion formula can fit thedata better and can be used to better predict the compressive strength under various angles. Besides, themaximum stress criterion can also be used to predict compressive strength when the failure models are considered at the same timeKey words: compression at an angle to grain; laminated veneer lumber(LVL); compressive strength; stiffness; strength criterion单板层积材(LVL)是工程木中的一种,俗称旋一,其决定了销连接节点等复杂受力情况下的整切板胶合木,由多层单板平行施胶层叠并加温加体强度.Hil2)于1947年将各向同性材料常用的压而成.因其具有良好的力学性能,故常用于大空间 Mises屈服准则推广到各向异性材料中去,但未考的公共建筑、体育场馆等建筑中虑材料拉压强度的不同.针对木材这一特殊材料,斜纹承压强度是木材力学性质的重要指标之 Y amada等、陈志勇等相继进行了木材在复杂收稿日期:2012-08-22;修订日期:2012-10-19基金项目:“十二五”国家科技支撑计划项目(2012BAD23B01)第一作者:钟永(1985-),男,溯北荆州人,中国林业科学研究院助理研究员,硕士,E-mail:zhongyong108163.com通信作者:任海青(1969-),女,上海人,中国林业科学研究院研究员,博士生导师,博土,E-mail:renhqcatf.ac.cn