Abstract
The performance of glass fiber-reinforced epoxy resin (GFRP) reinforced circular steel tubes under axial compression was studied using both numerical and experimental methods. Through axial compression tests, the effects of steel tube thickness, GFRP winding angle (the angle between the axis of the tube and the tangential direction of winding fiber) and specimen length on specimens' failure modes and stability carrying capacity were studied; and proved that GFRP can improve the axial compression behavior of steel tube. A UMAT subroutine for GFRP that could consider 6 initial failure modes (fiber tension or compression failure, resin tension or compression failure and stretch or compression in-layer delamination failure) and damage evolution was developed, and then the axial compression processes of specimens were simulated; moreover, a further parametric analysis to examine specimens of different GFRP thickness and winding angle, steel tube diameter and thickness, as well as specimen length was carried out. A predictive formula was introduced to estimate the buckling load of specimen by modifying the Perry-Robertson equation. Finally, based on the simulation and the equivalent concept, the application of GFRP reinforced circular steel tube in the reticulated mega-structure was discussed.
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