摘要:拉挤型GFRP管材节点的可靠连接是保证其正常工作的前提。为研究其拉伸连接性能，本文采用胶接连接和螺栓连接两种连接方式对GFRP管材与钢管连接件分别开展了拉伸试验研究。在胶接连接试验中研究了胶层剪应力沿长度方向的分布特征、受力机理及失效过程、胶接长度对承载力影响等。试验结果表明：胶层剪应力在加载初期沿长度方向分布呈现两端大、中间小的分布特征，高应力发生在胶接端，并随荷载上升逐步往加载端胶层转移；胶接长度的增加能显著提高连接构件承载力，但当长度达到管径的1.6倍后，继续增加胶接长度对承载力的提升并不大，故可考虑将1.6倍管径作为GFRP管材的有效胶接长度。在螺栓连接试验中研究了e/d（端距/栓径）、螺栓排数n对连接承载力及破坏模式的影响，试验结果表明：当e/d=7时，承载力达到最大值，破坏形式以挤压破坏为主；根据螺栓排数n与承载力的关系，可以推导相应折减系数来计算承载力。

Abstract: The reliable connection of pultrusion forming GFRP pipe joints is a prerequisite to ensure the normal operation of the components. In order to research its tensile connection performance, this paper adopts two kinds of connection modes of bonding connection and bolt connection in GFRP pipe and steel pipe connector, and carries out its tensile test research respectively. The distribution characteristics, force mechanism, failure process and the influence of bonding length on load-bearing capacity of glue layer shear stress along the length direction was studied in the adhesive bonding test. The experimental results show that the shear stress of the glue layer is large at both ends and small in the middle along the length direction at the initial stage of loading. As the load increased, the stress gradually shifted towards the loading end of the glue layer. The increase of bonding length can significantly improve the load-bearing capacity of the connecting parts, but when the length reaches 1.6 times of the pipe diameter, the increase of the bonding length is not obvious to the increase of the load-bearing capacity. Therefore, the 1.6 times the pipe diameter can take into account as the effective bond length of the GFRP pipe. The influence of e/d (edge distance/bolt diameter) and bolt row number on the connection load-bearing capacity and failure mode were studied in the bolt connection experiment. The experiment results show that when is equal to 7, the load-bearing capacity reaches the maximum value and the main failure mode is extrusion failure. According to the relationship between the bolt row number and the load-bearing capacity, the corresponding reduction coefficient can be deduced for calculating the load-bearing capacity.

FRP-混凝土组合箱形截面双层交通结合体系受力机理及设计方法研究项目（项目编号：51578236）