Abstract: Glass fiber reinforced plastics has been widely applied in various engineering areas for several decades. Both the domestic and foreign have carried out extensive research, but few on the longtermproperties of glass fiber reinforced plastics. The current domestic design is basically based on the initial performance reduction according to certain safety coefficient. The safety of this kind of design method needs further research. From the perspective of viscoelastic analysis, this paper designs the experiment scheme on the basis of theoretical research. And, though concrete experiment, the relationshipe of the strength of different layer spread angle of glass fiber reinforced plastic under certain stress level with the keeping time was measured. Based on the experimental data processing, the long-term performance of retained strength and its relation with the time was deduced,proving the accuracy of the conclusion by combining with the relevant specification.

Key words: glass fiber reinforced plastic, long-term performance, creep property, reserved strength