GFRP缠绕管-螺旋筋复合约束混凝土柱轴压性能试验OA

To investigate the axial compression performance of GFRP wrapped tube-spiral reinforced concrete composite columns,11 specimens were subjected to axial compression performance tests with varying parame-ters including GFRP tube wall thickness,reinforcement ratio of spiral stirrup,yield strength of spiral stirrup,and aspect ratio.The failure modes of the specimens,the characteristics of load-displacement curves,the law of strain variation,the ultimate bearing capacity,and the ductility were explored.The results show that adding steel cages to GFRP wrapped concrete columns can transform the failure mode of specimens from brittle failure mode to ductile failure mode,and significantly improve both bearing capacity and ductility.The restraining effect of spiral stirrup is mainly manifested in the elastic-plastic stage and the flow plastic stage.Increasing the ratio of spiral stirrup and the yield strength of spiral stirrup can significantly improve the axial compression per-formance of the specimen.Compared with galvanized iron wire,the specimens with high-strength steel wire as spiral stirrup exhibit an increase of approximately 30%in bearing capacity and an improvement of around 70%in ductility.With the increase of aspect ratio,the axial compressive bearing capacity decreases by about 7.41%,and the ductility decreases by about 42.59%.The brittle fracture characteristics are more prominent.