玻璃纤维加强型胶合木梁柱植筋节点受力性能研究

Research on the mechanical behavior of GFRP reinforced glulam beam-column glued-in rod joints

针对胶合木梁柱纯植筋节点的延性及耗能不足问题,提出采用玻璃纤维增强复合材料(GFRP)的加强型梁柱植筋节点,以使植筋有效发挥作用,改善节点受力性能。运用ABAQUS软件分析了纤维布粘贴方式、层数对植筋节点受力性能的影响,确立合理的粘贴方案后,采用试验与数值模拟相结合的方式,对比分析有、无加强型胶合木梁柱植筋节点在低周往复荷载作用下的破坏形态及滞回性能。结果表明:玻璃纤维增强复合材料对节点的加强效果明显,节点延性和耗能均得到有效改善;但在保证植筋节点承载力达到预期目标的情况下,有必要根据设计承载力要求合理控制GFRP的粘贴层数,以避免浪费。

In order to solve the problems of insufficient ductility and energy dissipation capacity of pure glulam joints with glued-in rods,a reinforced beam-column joint with glass fiber reinforced polymer(GFRP)was proposed to make the steel rods play an effective role and improve the mechanical performance of the joints.Abaqus software was used to analyze the influence of the bonding methods and the number of layers of fiber cloth on the mechanical properties of the reinforced joints.After establishing a reasonable bonding scheme,the failure mode and hysteretic behavior of the reinforced and unreinforced glulam beam-column joints under low cyclic loading were compared and analyzed by means of experiment and numerical simulation.The results show that the GFRP have obvious strengthening effect on the joints,and the ductility and energy dissipation capacity of the joints are effectively improved.However,it is necessary to reasonably control the number of GFRP layers to avoid waste in the case of ensuring that the bearing capacity of the joint reaches the expected goal.