Analysis of Stress–Strain State in a Steel Pipe Strengthened With a Composite Wrap

Abstract

In this paper, strengthening of a steel pipe with a composite wrap is analyzed. An analytical model taking into account joint reaction of the pipe and the wrap, twodimensional stress state and plastic strains in the pipe wall is developed. Verification of the model is performed by comparison of the numerical results to the fullscale test results for a strengthened pipe under the action of internal pressure. The developed model is applied to the analysis of a buried gas pipeline subjected to the internal pressure and temperature loading. The results obtained with the analytical model are compared to the results of a finiteelement simulation. A good agreement is established. The effect of wrap thickness on the stress–strain state and loadcarrying capacity of the strengthened pipe is studied.