Collapse of reinforced thermoplastic pipe (RTP) under combined external pressure and bending moment. (15th January 2015)

• Record Type: Journal Article
• Authors: Bai, Yong; Tang, Jiandong; Xu, Weiping; Cao, Yu; Wang, Ruoshi
• Is Part Of: Ocean engineering. Volume 94(2015)
• Page Start: 10
• Page End: 18
• Publication Date: 2015-01-15
• Subjects: RTP pipeline -- Collapse -- Engineering design formula -- Finite element model; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2014.10.002
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: With shear deformation and pre-buckling deformation included, a 2D mathematical model for composite pipes is developed to analyze the collapse of RTP pipe under pure external pressure, pure bending moment, or combined external pressure and bending moment. The models for RTP pipes are developed based on the models of steel pipe proposed by Kyriakides and his co-workers. Theoretical analyses of collapse of RTP pipe under short-term hydrostatic external pressure, bending moment, or combined external pressure and bending moment have been presented in this paper. The effects of radius–thickness ratios, initial ovality and initial stresses, pre-buckling deformation and modulus of elasticity have been discussed. Through data fitting, formulas of RTP collapse under pure external pressure, pure bending moment, or combined external pressure and bending moment have been developed. A good agreement between the calculation based on formulas and finite element analysis verifies the efficiency of the formulas. Highlights: In this study the behavior (ovalization instability) of RTP pipes combined bending load and external pressure is presented. Data fittings are conducted to obtain the engineering calculation formulas of the bearing capacity of the pipe under pure external pressure, pure bending moment and combined bending and external pressure. A finite element model is built with commercial FE software ABAQUS to verify the formulas and good agreement has been achieved.