GFRP支撑结构扣件节点转动刚度研究

Research on torsional stiffness of fastener joints in GFRP supporting structure

玻璃纤维增强塑料(简称“GFRP”)支撑结构节点转动刚度是研究GFRP支撑结构稳定性的重要参数,但目前尚未展开研究。本文首先通过试验对不同拧紧力矩下GFRP支撑结构扣件节点转动刚度进行研究,建立了弯矩-转角曲线,得到了不同拧紧力矩下的节点转动刚度;然后建立有限元模型对拧紧力矩如何影响扣件节点转动刚度进行机理分析;最后得到了不同拧紧力矩对节点转动刚度的影响机理。研究表明:GFRP圆管扣件连接节点属于半刚性节点,增大节点的拧紧力矩,节点的转动刚度随着拧紧力矩的增大而增大。本文得到的GFRP扣件节点转动刚度可以为GFRP扣件式支撑结构整体稳定承载力的研究与计算提供理论依据。

The torsional stiffness of GFRP support structure joints is an important parameter to study the stability of GFRP support structure,but it has not been studied.In this paper,the torsional stiffness of fastener joints of GFRP support structure under different tightening torques is studied through experiments,and the bending moment-rotation angle curve is established to obtain the torsional stiffness of joints under different tightening torques.Then the finite element model is established to analyze how the tightening torque affects the torsional stiffness of the fastener joint.Finally,the influence mechanism of different tightening torques on the rotational stiffness of the joint is obtained.The research shows that the GFRP tube fastener connection node is a semi-rigid node.With the increase of the tightening torque of the node,the rotational stiffness of the node increases with the increase of the tightening torque.The torsional stiffness of GFRP fastener joints obtained in this paper can provide a theoretical basis for the research and calculation of the overall stability bearing capacity of GFRP fastener support structure.