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拉挤GFRP管材与钢管连接的拉伸试验研究
祝明桥, 李志彬, 王瑶, 张紫薇
湖南科技大学 土木工程学院, 湖南 湘潭 411201
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,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。
关键词:  GFRP管材  胶接连接  螺栓连接  拉伸试验
DOI:10.11835/j.issn.2096-6717.2019.077
分类号:TU382
基金项目:国家自然科学基金(51578236)
Tensile test of pultruded GFRP pipe connected with steel pipe
Zhu Mingqiao, Li Zhibin, Wang Yao, Zhang Ziwei
Department of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, P. R. China
Abstract:
The reliable connection of pultrusion forming GFRP pipe joints is a prerequisite to ensure the normal operation of the components. In order to explore its tensile connection performance, two kinds of connection modes of bonding connection and bolt connection in GFRP pipe and steel pipe connector are adopted in this study to carry out the tensile test. 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 were studied in the adhesive bonding test. The 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 sensitive to the increase of the load-bearing capacity any more. Therefore, the 1.6 times the pipe diameter can be regarded as the effective bond length of the GFRP pipe. Additionally, 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 results show that when e/d 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 readily deduced for calculating the load-bearing capacity.
Key words:  GFRP pipe  adhesive bonding  bolt connection  tensile test
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