基于钢板钢筋连接的拼接GFRP管混凝土组合构件抗弯性能试验研究

基于钢板钢筋连接的拼接GFRP管混凝土组合构件是利用在两个独立的GFRP管连接处的内部设置钢板钢筋连接件，再在内部浇筑混凝土，而形成的一种新的连续GFRP管混凝土组合构件。目前，国内外对拼接GFRP管混凝土组合构件的抗弯性能研究尚未见到相关报道，所以，该文对拼接GFRP管混凝土组合构件进行抗弯性能试验研究很有意义。试验结果表明，连接钢筋含量影响着拼接构件的破坏模式，含钢率为1.96%的试件破坏发生在连接处，含钢率为2.94%的试件破坏发生在焊接钢筋端部附近，此外，含钢率高的试件承载力比含钢率低的明显高，并且拼接构件承载力均高于相应对比试件，说明，试验所采用的钢板钢筋连接是可行的，均能保证试件正常工作，建议最小含钢率取为1.96%。

EXPERIMENTAL RESEARCH ON BENDING PERFORMANCE OF SPLICED CONCRETE-FILLED GFRP TUBE COMPOSITE MEMBERS CONNECTED WITH STEEL PLATES

The spliced concrete-filled GFRP tube composite member connected with steel plates is a new type of composite member, which is formed by connecting two independent GFRP tubes with steel plates and filling the tubes with concrete. At present, few researches have been conducted on the bending performance of the spliced concrete-filled GFRP tube members, thus the work presented in this paper is new. The test results showed that the content of the connecting steel bars influenced the failure mode of the spliced members. For the member with the steel ratio of 1.96%, the damage occurred at the joint; while for the member with the steel ratio of 2.94%, the damage occurred near the end of the welded reinforcement. Besides, the test specimen with high steel ratio had higher bearing capacity than those with low steel ratio. Moreover, the spliced members had higher bearing capacity than their non-spliced counterparts, showing the splicing through steel plates was feasible and could guarantee the mechanical behaviour of the spliced members. The minimum steel ratio was suggested to be 1.96%.