摘要
正交胶合木(Cross-laminated timber,CLT)胶层剪切强度是其胶合质量评价的重要指标。依据层板模量(8~12 GPa为低、12~16 GPa为中、16 GPa以上为高)、层数(3、5层)、层板厚度(15、25 mm)、组坯方向(正交和45°)共设置6种组坯方式,按照LY/T 3039—2018《正交胶合木》测试CLT板胶层剪切强度。研究结果表明:胶层剪切的破坏模式主要有沿着木材表面发生锯齿状剪切破坏和沿着横向层层板年轮方向剪切破坏;加载速率对胶层剪切强度影响不显著;除层板厚度对CLT板胶层剪切强度影响不显著外,表层层板模量、层板层数、组坯方向对CLT板胶层剪切强度存在显著性影响。
The bonding shear strength of cross laminated timber(CLT)is an important index to evaluate the bonding quality of CLT.There were six kinds of layup methods including the modulus of outer laminate(>8~<12 GPa(low),≥12~≤16 GPa(middle),and>16 GPa(high),the number of layers(three layers and five layers),the thickness of timber(15 mm and 25 mm),and layup directions(orthogonal and inclined 45 degrees).Based on LY/T 3039—2018,the bonding shear strength of CLT plate was tested.The results showed that the main failure modes were serrated shear failure along the wood surface and shear failure along the annual ring of transverse direction of the laminate.The loading rate had no significant effect on the bonding shear strength of CLT.The MOE of outer laminate,the laminate number,and the direction of layup had significant effects on the bonding shear strength of CLT plate,except that the laminate thickness.
作者
龚迎春
任海青
丁青锋
GONG Ying-chun;REN Hai-qing;DING Qing-feng(Research Institute of Wood Industry,Chinese Academy of Forestry,Beijing 100091,China;Suzhou Crownhomes Co.,Ltd.,Suzhou 215100,Jiangsu,China)
出处
《木材科学与技术》
北大核心
2021年第2期49-53,共5页
Chinese Journal of Wood Science and Technology
基金
国家重点研发计划“绿色建筑及建筑工业化”(2017YFC0703501)
国家木竹产业技术创新战略联盟科研计划“木竹多高层结构体系开发与设计”(TIAWBI201908)。
关键词
正交胶合木
胶层剪切强度
落叶松
破坏模式
组坯结构
缝隙宽度
cross-laminated timber
bonding shear strength
Larix kaempferi(Lamb.)Carr.
failure modes
lay-up structure
gap width
