为研究内嵌GFRP筋增强胶合木梁的抗弯性能,制作了11根铁杉胶合木梁,依据欧洲BS EN 408标准,对其进行四点弯曲加载试验.试验参数包括:开槽位置、槽口数量及槽口形状.试验结果表明:对胶合木梁开槽会使胶合木梁的抗弯性能显著下降,而圆形槽口对于木材的破坏程度小于方槽;同时在受拉区和受压区对胶合木梁增强,其效果比单独在受拉区增强的效果更好,极限荷载和延性系数分别提高了5.88％、16.85％;仅在木梁受拉区增强时,增加GFRP筋的数量,除了延性得到改善外,刚度和极限承载能力均降低;采用圆形槽口增强时,其增强效果优于用方槽对胶合木梁的增强.
Study on Bending Behavior of Glulam Beams Reinforced with Bonded-in GFRP Rods
To learn the bending behavior of glulam beams reinforced with GFRP rods,making 11 hemlock glulam beams and conducting four-point bending tests based on BS EN 408.The test parameters included groove position,groove number and shape of the notches.The results show that when glulam beams are grooved,their bending performance significantly decreased and the damage degree of circular grooves for wood is less than the square grooves.At the same time,in the tensile and compressive area of glulam beams strengthen,its enhancement effect is superior to the beams that only strengthen in the tension zone.Its ultimate load and ductility coefficient increased by 5.88％ and 16.85％;When the tension zone of the glulam beams are reinforced,increasing the number of GFRP rods,its stiffness and ultimate bearing capacity reduced,but ductility improved.The reinforcement effect of circular groove is better than square groove.
NETL
NSTL
万方数据
维普
