复合材料科学与工程Issue(3)：1-6,29,7.DOI:10.19936/j.cnki.2096-8000.20250328.001
拼装式复合材料圆管接头弯曲性能试验研究
Experimental study on the bending performance of assembled joints for composite circular tubes
摘要
Abstract
To enable the rapid on-site assembly and construction of lightweight fiber reinforced polymer(FRP)emergency footbridge,an assembled composite tubular joint that incorporates pre-tightened toothed connection(PT-TC)and metal tube threads was proposed.Four-point bending tests were conducted on two types of specimens with different local structures to compare and analyze their mechanical behaviors,such as failure modes and ultimate load-bearing capacities.The results indicate that the proposed assembled composite tubular joint not only facilitates rapid assembly but also exhibits high flexural behavior,making it suitable for composite tubular beam configuration in e-mergency footbridges.When the assembled joint was subjected to bending loads,the absence of a chamfer on the metal sleeve of the PTTC led to localized transverse shear failure and initial damage to the composite tube.Thereaft-er,compression and tension stresses were induced on the upper and lower side of the composite tube,respectively,resulting in premature longitudinal fiber failure.Adjacent composite tubes experienced typical bending-induced de-lamination.However,when a chamfer was introduced,there was no obvious local transverse shear failure of the composite tube at the corresponding junction of the dissimilar materials,which shows typical bending failure charac-teristics.Unlike with axial loading,when the joints are subjected to bending loads,optimizing the chamfer design at the metal sleeve's end is crucial.This optimization not only improves the failure mode of the assembled composite tubular joint but also enhances its bearing capacity by approximately 15%.关键词
纤维增强复合材料/应急人行桥/拼装式结构/圆管连接/预紧力齿连接/抗弯性能Key words
fiber reinforced composite/emergency pedestrian bridge/assembled structure/tubular joint/pre-tightened teeth connection/flexural behavior引用本文复制引用
袁帅,张冬冬,段金辉,高一峰,张芸强,莫昌金..拼装式复合材料圆管接头弯曲性能试验研究[J].复合材料科学与工程,2025,(3):1-6,29,7.基金项目
国家自然科学基金(52278230) （52278230）
江苏省自然科学基金(BK20221531) （BK20221531）
