首页|侧压竹集成材抗剪强度试验研究

侧压竹集成材抗剪强度试验研究

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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.
Experimental study on shear strength of side-pressure laminated bamboo lumber
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.

side-pressure laminated bamboo lumbershear strengthexperimental studystrength standard valuestrength design value

谢婉琼、陈伯望

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中南林业科技大学土木工程学院,湖南 长沙 410004

侧压竹集成材 抗剪强度 试验研究 强度标准值 强度设计值

湖南省科技创新计划资助项目

2022GK4052

2024

四川建筑科学研究
四川省建筑科学研究院

四川建筑科学研究

影响因子:0.422
ISSN:1008-1933
年,卷(期):2024.50(4)
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