Numerical and experimental study of concrete I-beam subjected to bending test with cyclic load

Abstract

This paper provides guidelines for cyclic loading bending test simulation and modal analysis of a reinforced concrete I-beam. For this purpose, experimental and numerical cyclic bending test were performed. In the experimental study, the natural frequencies of the structure in the intact and damaged states were measured. The simulation of the cyclic bending test was done with Concrete Damaged Plasticity model (CDP), implemented in Abaqus finite element software. Based on the experimental results, different constitutive models for concrete were evaluated. In order to evaluate the dynamic behavior of the structure in the numerical model, the automatic calibration of the finite element model by Genetic Algorithm (GA) was used. With the calibrated numerical model, methodologies for estimating the overall damage of the structure based on its dynamic properties were proposed. The results confirm that the well-designed numerical model is able to efficiently represent the cyclic loading bending test. In addition, the proposed global damage estimates demonstrate the coherence between numerical and experimental models.

Numerical investigation on slim floors: comparative analysis of ASB and CoSFB typologies

“…The first was dilation angle, which measures the slope of the plastic potential for high confinement stresses -low values are related to concretes of fragile behavior, whereas high ones represent a ductile behavior. Another parameter is flow potential eccentricity, defined as a form assumed by the flow surface, usually a hyperbola of 0.1 default value [33]. The biaxial/uniaxial compressive strength ratio was adopted for the description of the point at which concrete fails due to biaxial compression (1.16 default value).…”

“…The fourth parameter determined was ratio of the distances between the hydrostatic axis and compression meridian and tension meridian (Kc), which defines the shape of the concrete failure surface (the default value in ABAQUS® is 0.6667). Viscosity repairs convergence difficulties when the model shows degradation of stiffness [33]. Table 3 displays the values of the parameters.…”

“….The mathematical formulation of the tension and compression behavior of the concrete used in CDP is provided in Ribeiro et al [33]. CDP also enables the definition of damage variables, which represent the degradation of the concrete stiffness under concentrated or cyclic loads.…”

New damage evolution law in plastic damage models for fiber‐reinforced cementitious composites

“…Different laws have been established based on experimental data, 10,11 and theoretical descriptions. 12,13 Simple evolution laws are commonly used to simulate the nonlinear response of concretes 14 and ultrahigh performance fiber reinforced concretes. 15,16 The equivalent uniaxial plastic strain is employed to quantify the damage field, as suggested by Birtel and Mark.…”

One-way shear and punching strength of reinforced concrete slabs without transverse reinforcement under concentrated loads

“…A large number of studies contributed to predicting the sectional shear capacity of reinforced concrete (RC) beams (RIBEIRO et al, 2020;SANTOS et al, 2019) and the punching capacity of flat slabs or slab-column connections (SOUSA et al, 2021b; GENIKOMSOU; POLAK, 2015) using three-dimensional (3D) non-linear finite element analyses (NLFEA).…”