胶合竹顺纹植筋的抗拔性能  

Pull-out Strength for Glued-in Rod Parallel to the Grain of Structural Guled Laminated Bamboo

作　　者：张秀标 江泽慧 孙正军 武秀明 刘焕荣 

机构地区：[1]国际竹藤中心,北京100102

出　　处：《东北林业大学学报》2015年第4期96-100,107,共6页Journal of Northeast Forestry University

基　　金：林业公益性行业科研专项(201204701)

摘　　要：选择胶合竹为研究对象,以双组分环氧树脂为胶黏剂,采用拉—拉荷载模式开展胶合植筋连接抗拔性能研究。主要探讨了边距、胶层厚度以及长径比等对植筋连接抗拔强度的影响。结果表明:边距对植筋连接抗拔强度有一定影响,边距过小导致胶合竹开裂,抗拔强度下降,推荐边距应大于4d(植筋杆直径);胶层厚度对植筋抗拔强度影响不显著;长径比是影响植筋连接抗拔强度的重要因子,抗拔强度随长径比的增大而增大,并存在一个临界植入深度使得抗拔强度等于植筋杆屈服强度。胶合竹与胶黏剂粘接界面名义剪切强度随长径比的增大而减小。根据长径比给出植筋抗拔强度预测方程。试验过程中主要产生胶合竹开裂、植筋杆拔出和植筋杆屈服3种破坏模式。With structural glued laminated bamboo as study object,we used two-component epoxy to study the pull-out strength of glued in rod,and tested the specimens in pull-pull configuration. We also studied the influence of edge distances,glue thickness and the slenderness ratio on pull-out strength. The edge distances had certain effect on pull-out strength,the pull-out strength was decreased when the edge distance was too small; because the glulam was cracking in this case,the recommended edge distances was 4d（ d is the rod diameter）. The glue thickness had insignificant effect on pull-out strength. The slenderness ratio has an important effect on pull-out strength. The pull-out strength was increased with the slenderness ratio increasing,and there was a critical embedded depth making the pull-out strength of glued-in rod equal to the yield strength of the steel rod. The nominal shear strength of glulam / adhesive was decreased with slenderness ratio increasing. We got the mean pull-out strength of a single axially loaded rod set parallel to the grain. The main failure modes were glulam cracking,shear failure along the rod and yielding of the rod.

关 键 词：胶合竹 边距 胶层厚度 长径比 抗拔强度 

分 类 号：S781.9[农业科学—木材科学与技术]