Plastic-damage smeared crack model to simulate the behaviour of structures made by cement based materials

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:73-74

Article

Edalat Behbahani, A.¹  Barros, J. A. O.¹  Ventura-Gouveia, A.² 

[1] Univ Minho, ISISE, Sch Engn, Dept Civil Engn, Guimaraes, Portugal

[2] Polytech Inst Viseu, ISISE, Sch Technol & Management Viseu, Dept Civil Engn, Viseu, Portugal

关键词: FEM analysis;    Fixed smeared crack model;    Elasto-plasticity;    Isotropic damage;    Shear strengthening;   

DOI  :  10.1016/j.ijsolstr.2015.07.027

来源: Elsevier

【 摘 要 】

This work proposes a constitutive model to simulate nonlinear behaviour of cement based materials subjected to different loading paths. The model incorporates a multidirectional fixed smeared crack approach to simulate crack initiation and propagation, whereas the inelastic behaviour of material between cracks is treated by a numerical strategy that combines plasticity and damage theories. For capturing more realistically the shear stress transfer between the crack surfaces, a softening diagram is assumed for modelling the crack shear stress versus crack shear strain. The plastic-damage model is based on the yield function, flow rule and evolution law for hardening variable, and includes an explicit isotropic damage law to simulate the stiffness degradation and the softening behaviour of cement based materials in compression. This model was implemented into the FEMIX computer program, and experimental tests at material scale were simulated to appraise the predictive performance of this constitutive model. The applicability of the model for simulating the behaviour of reinforced concrete shear wall panels submitted to biaxial loading conditions, and RC beams failing in shear is investigated. (C) 2015 Elsevier Ltd. All rights reserved.

【 授权许可】

Free