Izvorni znanstveni članak
Validation of the developed triaxial nonlinear material model for concrete
Mirela Galić
; University of Split, Faculty of Civil Engineering, Architecture and Geodesy
Pavao Marović
; University of Split, Faculty of Civil Engineering, Architecture and Geodesy
Sažetak
This paper presents a validation of newly developed material model for concrete. The model is based on a combination of elasto-fractureplastic formulation, considering all dominant influences in concrete: yielding in compression, fracture in tension, softening and hardening. The modified Mohr-Coulomb criterion for dominant compression stresses, the modified Rankine criterion for dominant tension stresses, exponential softening and the function for hardening are considered in this model. All constitutive equations are defined by elementary material parameters (Young’s modulus of elasticity, Poisson’s coefficient, maximal uniaxial tensile and compression stresses, the coefficient of tensile correction, maximal tensile and maximal compression strains). A multi-surface presentation of the model is implemented which permits the rapid convergence of the mathematical procedure. The model uses return-mapping algorithm for the integration of the constitutive equations with associated and non-associated flow rules. Considering triaxial stress state, the paper presents the structural validation of a developed numerical model, which is incorporated into computer programme PRECON3D, illustrated on four examples, both experimental and numerical, taken from the literature: (i) four point bending of normalstrength and high-strength reinforced concrete beams with four different constant-zone lengths and two different reinforcement ratios; (ii) three point bending of reinforced concrete beam; (iii) prestressed concrete beam; (iv) prestressed Π-beam.
Ključne riječi
material model; nonlinearity; triaxial stress state; concrete numerical analysis; validation
Hrčak ID:
184819
URI
Datum izdavanja:
18.7.2017.
Posjeta: 755 *