竹集成材握钉性能试验研究  

Experimental Study on Withdrawal Performance of Laminated Bamboo Lumber

作　　者：陈国[1] 吴迪[1] 王畅 张恩浩 周通 CHEN Guo;WU Di;WANG Chang;ZHANG Enhao;ZHOU Tong(College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]南京林业大学土木工程学院,江苏南京210037

出　　处：《土木工程与管理学报》2024年第1期13-18,共6页Journal of Civil Engineering and Management

基　　金：国家自然科学基金(52178220)。

摘　　要：为研究单调加载下的竹集成材(LBL)握钉性能,对260个LBL钉节点试件进行拔出试验,以钉种类、钉直径、有效锚固长度以及作用力方向与LBL顺纹方向的夹角为参数,研究其破坏模式和握钉性能。结果表明:破坏模式与钉种有关,与钉直径、锚固长度和角度无关,光圆钉试件无可见破坏,而螺钉和麻花钉试件的破坏模式主要表现为钉杆环向的竹纤维发生剪切破坏,LBL内部竹纤维被环向肋纹切断并拉出试件表面。极限抗拔承载力随钉直径和有效锚固长度的增大而增加,顺纹向的承载力略低于横纹向。对于相同直径的钉而言,顺纹向螺钉和麻花钉的极限承载力分别为光圆钉的2.6倍和1.3倍,而横纹向的螺钉和麻花钉的抗拔承载力分别为光圆钉的2.3倍和1.2倍。LBL握钉力理论计算值和试验值吻合良好,误差不超过13%。In order to study the withdrawal performance of laminated bamboo lumber(LBL)under monotonic loading,260 specimens were tested to investigate the effect of the nail type,diameter,effective penetration depth,and angle between the loading and grain of LBL on the failure modes and withdrawal performance.It is found that the failure modes are closely related with the nail type but not nail diameter,effective penetration depth,and loading angle.No visible failures were found in the specimens inserted by the smooth-shanked nail.For screws and twist nails,significant failure phenomena were recorded,including bamboo fibers shear failure around the nail,and bamboo fiber in the LBL members were cut off and pulled out of the specimens.The maximum withdrawal resistance increases with the increase of the nail diameter and effective penetration depth,and the withdrawal capacity in the longitudinal direction is slightly lower than that in the transverse direction.For the specimens with the same nail diameter,the ultimate withdrawal capacity of screws and twist nails in the longitudinal direction is 2.6 times and 1.3 times that of smooth-shanked nails,while the capacity of screws and twist nails in the transverse direction is 2.3 times and 1.2 times that of smooth-shanked nails,respectively.Good agreement between the experimental results and the theoretical results predicted by the suggested formula is achieved,and the error is not greater than 13%.

关 键 词：竹 钉 竹集成材 拔出试验 握裹力 抗拔承载力 

分 类 号：TU366.1[建筑科学—结构工程] TU531.3