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

作　　者：谢婉琼 陈伯望[1] XIE Wanqiong;CHEN Bowang(School of Civil Engineering,Central South University of Forestry and Technology,Changsha 410004,China)

机构地区：[1]中南林业科技大学土木工程学院,湖南长沙410004

出　　处：《四川建筑科学研究》2024年第4期8-16,共9页Sichuan Building Science

基　　金：湖南省科技创新计划资助项目(2022GK4052)。

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。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 

分 类 号：TU366.1[建筑科学—结构工程]