Abstract
Sandwich pipes (SP) can be an effective solution for the ultra-deepwater submarine pipeline, combining high structural resistance with thermal insulation capability. Besides polymer, steel fiber reinforced concrete (SFRC) can be another choice for the annular material, based on the characteristics of high fracture toughness and good adhesion with metal. The purpose of this chapter is to investigate numerically the ultimate strength of SP filled with SFRC under external pressure and longitudinal bending. The mechanical behavior of SFRC is simulated using a Concrete Damaged Plasticity (CDP) model whose parameters are estimated by uniaxial tension, compression, and four-point bending tests. The applicability of the parameters obtained is verified by simulating the compression and four-point bending tests, where the results show good correlation between measured and predicted numerical values. Pressure–curvature ultimate strength for SP with perfect adhesion and no adhesion interface condition is obtained. Besides, a parametric study is performed to investigate the effect of the thickness of each layer on the pressure–curvature collapse envelope of SP.
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An, C., Duan, M., Estefen, S.F., Su, J. (2021). Sandwich Pipes Filled with Steel Fiber Reinforced Concrete. In: Structural and Thermal Analyses of Deepwater Pipes . Springer, Cham. https://doi.org/10.1007/978-3-030-53540-7_3
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