侧压竹集成材抗剪强度试验研究
Experimental study on shear strength of side-pressure laminated bamboo lumber
谢婉琼 1陈伯望1
作者信息
- 1. 中南林业科技大学土木工程学院,湖南 长沙 410004
- 折叠
摘要
侧压竹集成材为天然竹片经精制、干燥、碳化、胶合压制而成的板材或枋材,是一种新型的绿色建材.为探究侧压竹集成材的抗剪性能,对 4 组 60 个侧压竹集成材清材小试件进行了抗剪强度试验,得到了其顺纹切向、顺纹径向、横纹切向、横纹径向的抗剪强度,分析了清材小试件在不同受剪方向的破坏特征、荷载-位移关系,提出了侧压竹集成材抗剪强度标准值和设计值的计算公式;同时进行了 2 组 12 个东北落叶松胶合木清材试件的顺纹切向和顺纹径向抗剪强度试验,并与侧压竹集成材的抗剪强度进行了对比.结果表明:侧压竹集成材具有良好的抗剪性能,顺纹剪切呈脆性破坏,横纹剪切具有比较好的延性;侧压竹集成材的抗剪强度平均值比东北落叶松胶合木高 33.9%,其强度标准值和设计值可为侧压竹集成材的工程设计提供依据.
Abstract
Side-pressure laminated bamboo lumber is a natural bamboo sheet re-fined,dried,carbonized and glued,and pressed into a sheet material or lumber,which is a new type of green building material.To investigate the shear resistance of side-pressure laminated bamboo lumber,four groups of sixty clear wood specimens of side-pressure laminated bamboo lumber were tested for shear strength,and the shear strengths of its parallel-to-grain chord,parallel-to-grain radial,transverse chord,and transverse radial were obtained,the failure characteristics and load-displacement curve of the clear wood specimens in different shear directions were analyzed,and the calculation formulas of the strength standard value and the strength design value of the side-pressure laminated bamboo lumber were proposed.The shear strength tests of two groups of twelve clear wood specimens of northeast larix glued timber in the parallel-to-grain chord and parallel-to-grain radial were conducted and compared with the shear strength of side-pressure laminated bamboo lumber.The results show that the side-pressure laminated bamboo lumber has excellent shear behavior,brittle failure in shear along the grain,and excellent ductility in shearn transverse.The average shear strength of side-pressure laminated bamboo lumber is 33.9%higher than that of laminated bamboo glued timber,the strength standard value and the strength design value can provide the basis for the engineering design of side-pressure laminated bamboo lumber.
关键词
侧压竹集成材/抗剪强度/试验研究/强度标准值/强度设计值Key words
side-pressure laminated bamboo lumber/shear strength/experimental study/strength standard value/strength design value引用本文复制引用
基金项目
湖南省科技创新计划资助项目(2022GK4052)
出版年
2024
NETL
NSTL
万方数据