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钢筋拼接GFRP管混凝土组合构件是利用在2个独立的GFRP管连接处的内部设置一定长度钢筋笼,再在内部浇注混凝土,而形成的一种新的连续GFRP管混凝土组合构件。近年来,不少国内外研究人员对连续GFRP管混凝土构件的力学性能做了一些研究,而对拼接GFRP管混凝土构件的力学性能研究较少,所以,有必要借助试验,研究其力学性能。该文主要对钢筋拼接GFRP管混凝土组合构件的轴压性能进行了一定的试验研究,试验结果表明,在荷载达到60%Pu(Pu-极限荷载)左右时,GFRP管开始发挥“套箍”作用,拼接试件破坏位置不同于连续试件发生在一定范围内,而是发生在距连接处一定距离,并且,钢筋连接件的箍筋对混凝土起到约束作用。此外,试件破坏时纵筋均屈服,且纵筋对连接处的变形基本没有影响,拼接试件连接处均未破坏,说明采用低含钢率1.96%即可保证拼接GFRP管轴心受压组合构件正常工作。
Reinforced splicing GFRP pipe is a kind of new continuous GFRP pipe concrete composite component which is formed by pouring concrete inside by setting a length of reinforcement cage inside two independent GFRP pipe connections. In recent years, many researchers at home and abroad have made some researches on the mechanical properties of concrete members with continuous GFRP tubes. However, there are few studies on the mechanical properties of concrete members with GFRP tubes. Therefore, it is necessary to study the mechanical properties of GFRP concrete by means of experiments. In this paper, the axial compression properties of GFRP pipe reinforced concrete splicing members are studied. The results show that when the load reaches about 60% Pu (Pu-ultimate load), the GFRP pipe begins to play “ ”The role of splicing test pieces destruction location is different from the continuous specimen occurred within a certain range, but occurred at a distance from the junction, and the reinforcement of the connecting stirruns play a constraint on the concrete. In addition, when the test piece is damaged, the longitudinal bars yield, and the longitudinal bars have no effect on the deformation of the connection. The connection of the spliced test pieces is not damaged. This shows that the axial compression of the spliced GFRP pipe can be ensured by using the low steel content of 1.96% Combination of components to work properly.