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This paper describes the analysis of the mechanical behavior of the plastic pipe reinforced by cross helically winding steel wires (PSP) under pure internal pressure. PSP is a new kind of composite pipe developed rapidly in China recently and it consists of an inner high-density polyethylene (HDPE) layer, several steel wire layers over wrapping the liner and an outer polyethylene coating. To investigate the mechanical properties of steel wire layers, the elastic parameters of the composite monolayer plate are considered as transverse isotropic and derived based on Halpin-Tsai Equations. The stress and strain functions of each layers are obtained using anisotropic elastic mechanical theory and the unknown constants are determined by equilibrium equations and interface conditions. Using ABAQUS, a finite element model (FEM) is established to study the mechanical behavior and failure mode. Results derived from the theoretical method and FEM are presented and compared. Simplified engineering formula of burst pressure is also obtained. The effect of winding angle on PSP is also discussed by parametric analysis. Values of burst capacity predicted from the theoretical method, FEM and simplified engineering formula are in great agreement with the experimental results.

The collapse and buckling behaviors of reinforced thermoplastic pipe (RTP) under external pressure are studied in this paper. A theoretical model which includes axial and shear deformation is applied based on the model initially proposed by Kyriakides and his coworkers. Simulation of the reinforced layers of RTP is simplified using equivalent stiffness method. The load–displacement relation of RTP under external pressure is obtained based on the theoretical model. A three-dimensional (3D) finite element model (FEM) is also built to simulate the response of RTP using the software abaqus. Numerical simulation results from abaqus are similar to those from theoretical model. Besides, external pressure tests for RTP are carried out and the test results are compared with the analyzed results. Finally, factors that influence the external pressure capacity are also studied.