马尾松胶合木顺纹植筋抗拔性能研究

Study on Pull-out Strength for Glued-in Rod Parallel to the Grain of Pinus Massoniana Lamb Glulam

笔者选择国产马尾松胶合木为研究对象,并以双组份环氧树脂为胶黏剂,开展胶合植筋连接性能研究。采用拉-拉荷载模式,研究了植筋杆直径和植入深度对胶合木植筋抗拔强度和破坏模式的影响。研究结果表明:长径比是影响植筋连接破坏载荷的重要因子。破坏载荷随长径比的增大而增大,木材与胶黏剂粘接界面名义剪切强度随长径比λ的增大而减小。试验中主要产生木材开裂、植筋杆拔出和植筋杆屈服3种破坏模式。

Glulam made by Pinus massoniana was chosen as the main study object. Two-component epoxywas used and the performance of glued in rod was studied. The specimens were tested in pull-pull configuration. The influence of rod diameter and embedded length on pull-out strength was studied and the main failure modes were also analyzed. The results showed that the failure load increased with the slenderness ratio increasing. The nominal shear strength of wood/adhesive decreased with slenderness ratio increasing. The main failure modes were wood cracking, shear failure along the rod and yielding of the rod.