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ORIGINAL ARTICLE

Experimentally based parameters applied to concrete damage plasticity model for strain hardening cementitious composite in sandwich pipes Huarong Cheng

. Claudio M. Paz . Bianca C. Pinheiro . Segen F. Estefen

Received: 6 January 2020 / Accepted: 16 June 2020 Ó RILEM 2020

Abstract Sandwich pipes (SPs) composed of two concentrically steel tubes with a strain hardening cementitious composite (SHCC) filling core is a new concept designed for oil and gas transportation in deep waters. In this concept, the SHCC core is the most critical component that should withstand the combined loading of high hydrostatic pressure and bending moment. This paper proposes a particular concrete damage plasticity (CDP) model for the SHCC core based both on experimental data and on the continuum damage mechanics theory. The basic fundamentals of the CDP model can be divided into three major issues, namely, damage evolution, yield criterion, and plastic flow rule. For the damage evolution, two models of damage variables, under tension and compression, respectively, were built based on uniaxial experimental data available and the fracture energy theory. For the yield criterion, the parameters for the Lubliner model were fitted according to available experimental data from uniaxial and biaxial compressive tests. For the plastic flow rule, the dilation angle was deduced from the results of triaxial compressive tests combined with the Drucker-Prager type plastic flow rule. Finally, H. Cheng (&)  C. M. Paz  B. C. Pinheiro  S. F. Estefen Subsea Technology Laboratory, COPPE, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil e-mail: [email protected] H. Cheng China Ship Science Research Center, Wuxi, Jiangsu, China

four-point bending tests were carried out on SHCC specimens and collapse tests were conducted on SP models to allow a correlation study between experimental data and results obtained from numerical simulations incorporating the proposed CDP model. The correlation between numerical and experimental results showed good agreement, demonstrating that the proposed CDP model can accurately reproduce the mechanical behavior and damage distribution experienced by an SHCC material. Keywords Concrete damage plasticity model  Continuum damage mechanics  Strain hardening cementitious composite  Sandwich pipes

1 Introduction Strain hardening cementitious composite (SHCC), also named pseudo ductile cementitious composite (PDCC) [1] or engineered cementitious composite (ECC) [2, 3], is a large class of cement-based material that exhibits high ductility and multiple cracking in tensile tests [1, 4]. It belongs to the family of highperformance fiber-reinforced cementitious composites [5]. This material is widely used in bridges, dams, highway pavements, and civil engineering structures [6]. SHCC has also been applied in the design of a new

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class of subsea pipes to withstand high hydrostatic pressures, known as sandwich pipes (SPs) [7, 8