SPF胶合木植筋抗拔性能研究

采用“拉-拉”荷载模式研究SPF（云杉-松木-冷杉）胶合木植筋抗拔性能，探讨了边距、胶层厚度以及长径比等对胶合木植筋连接抗拔强度和破坏模式的影响。结果表明：边距对植筋连接抗拔强度有显著影响，胶层厚度对植筋抗拔强度有极显著影响，长径比是影响植筋连接抗拔强度的重要因子；植筋连接抗拔强度随长径比的增大而增大，当长径比达到一定值时植筋抗拔强度取决于植筋杆的屈服强度；胶合木开裂、植筋杆拔出和植筋杆屈服是试验中的3种主要破坏模式。
The pull？？out strength of rod glued in spruce？？pine？？fir (SPF) glulam was tested by pull？？pull loads. The influences of edge distance, adhesive layer thickness and slenderness ratio on the pull？？out strength and failure modes were also analyzed. The results showed that the edge distance significantly influenced on the pull？？out strength, while the adhesive layer thickness even more significantly influenced on pull？？out strength. The slenderness ratio was also an important factor influencing the pull？？out strength, which increased with the increasing of slenderness ratio. When the slenderness ratio reached a certain value, the pull？？out strength was determined by the yield strength of the rod. The main failure modes were wood cracking, shear failure along the rod and yielding of the rod