GFRP管混凝土柱的GFRP管拼接方法

GFRP tube splicing method of GFRP concrete column

为解决实际工程中GFRP管长度不足的问题,需要将两个或两个以上GFRP管拼接起来,并保证拼接处的力学性能,设计了基于钢筋、钢板锚筋及钢管连接件的拼接GFRP管钢筋混凝土试件,并通过试验,研究了拼接GFRP管钢筋混凝土轴心受压性能.试验结果表明:当加载到35%Pu(极限荷载)左右时,在GFRP管的表面出现白纹;当加载到65%Pu左右时,GFRP管开始产生套箍约束作用,继续加载,套箍约束作用继续存在.拼接试件的破坏以GFRP管的断裂为标志,破坏发生在距构件端部250 mm处,而对比试件的破坏发生在沿试件长度方向的中间位置;试验所设计的3种连接方式均能够保证拼接GFRP管钢筋混凝土轴心受压试件正常工作.

In order to solve the problem of GFRP tube in practical engineering,two or more than two GFRP tubes were spliced together and the mechanical properties of the joint were guaranteed. The experimental research on the mechanical property of continuous reinforced concrete-filled GFRP tubular specimen and splicing composite columns connected with steel bars,steel plates and steel tubes subjected to axial loading was conducted,and the results showed that the white stripes appeared on the surface of GFRP tube when the load respectively reached about35% Pu（ Pu-limit load）,and the confinement effect of GFRP tube began to produce when the load reached 65%Pu.With continued loading,the confinement effect still existed,and the failure of splicing specimens with GFRP tube was a symbol,and the splicing specimens occurred near the end of connectors around 250 mm. Relatively,the failure of the continuous specimen occurred in the middle position along the length direction of the specimen. The chosen connecting ways with three methods could ensure the normal work of splicing reinforced concrete-filled GFRP tubular composite columns under axial compression.