1.辽宁工程技术大学 土木工程学院;2.东北大学 资源与土木工程学院
1.School of Civil Engineering,Liaoning Technical University;2.School of Resourced of Civil Engineering,Northeastern University
In order to study the influence of creep behavior of glass fiber reinforced concrete hollow columns under axial compression, the mechanical properties of the hollow were analyzed according to the mechanical characteristics of the hollow column under axial compression in this paper. The creep formula of the GFRP tube reinforced concrete hollow column was established under axial compression.A creep analysis program was developed to calculate the creep strain-time relationship curve. And the correctness of creep program was verified by existing tests. On this basis, the influence of the main design parameters,such as action load, thickness of GFRP tube wall, strength grade of concrete and hollow ratio on creepperformance was calculated and analyzed. The results showed that creep of hollow columns increased rapidly in the early stage(28 days) of load action, and the growth rate was relatively slow after 28 days, and tended to be stable after about 6 months. The biggest influence on creep of GFRP tube reinforced concrete hollow columns under axial compression was action,followed by the thickness of GFRP tube wall. The influence of concrete strength grade and hollow ratio was relatively small.The conclusion can provide reference for engineering practice.