Numerical analysis of damage and failure behavior of concrete

Abstract

The paper discusses an anisotropic continuum damage model for concrete and its numerical implementation into a finite element program to provide an efficient approach suitable for boundary-value problems analyzing nonlinear concrete behavior. The phenomenological continuum approach is based on kinematic description of damage. Irreversible deformation behavior as well as volume increase of material samples even under compression loading are simulated by a damage strain rate tensor. The elastic constitutive equations are affected by damage strain tensors modeling decrease of elastic material parameters. The numerical procedure is based on the damage predictor–elastic corrector technique and the corresponding consistent tangent modulus is presented. Different experiments have been performed and deformation fields are analyzed by digital image correlation technique. Numerical simulations of the experiments show good agreement of the results and elucidate stress and damage states in the specimens. They allow prediction of failure modes of the tested specimens agreeing well with photographs of fractured cylinders and cubes. They also demonstrate the efficiency and the applicability of the proposed continuum damage model.

A chemo-micromechanical damage model of concrete under sulfate attack

“…Liao et al (2020) recorded the constitutive relationship of sulfateattacked concrete. The stress-induced microcracks were interpreted by damage variables based on the continuum damage mechanics (Bru¨nig and Michalski, 2020;Chen et al, 2020aChen et al, , 2020bJu, 1989Ju, , 1990Liu et al, 2020;Oucif et al, 2019;Ju, 1987a, 1987b;Tixier and Mobasher, 2003;Zhou and Ju, 2019;Zhou et al, 2016Zhou et al, , 2017Zhu et al, 2016), which has been widely adopted as the basis of other damage models (Chen et al, 2021;Fan et al, 2020;Liu et al, 2019;Sochu et al, 2018;Yan et al, 2019;Zhang et al, 2019Zhang et al, , 2020. In this context, the constitutive response of the progressively damaged material is simulated by a constitutive law of uniaxial stress-strain, which links the local strain with the damage.…”

Feasibility of segmented concrete in wind turbine tower: Numerical studies on its mechanical performance

“…Taking the tower piece of Floor19-3 as an example, the seam surface shows a pattern of compressive stress when the elastic modulus of rubber is equal to 6 MPa (seen in Figure 15). Taking into account its low tensile strength and less brittle behavior under compressive loading (Brünig and Michalski, 2020), this stress state of wind turbine tower is beneficial for the concrete material in terms of avoiding crack generation, which can have a significant effect on the behavior and strength of concrete (Kamali et al., 2020; Suchorzewski et al., 2018). When the elastic modulus of rubber pad is increased to 1 or 3 GPa, uneven distribution of tensile stress (blue contour) appears at the seam surface.…”

Local damage identification of high-strength circular concrete-filled steel tubes under low cycle fatigue

“…The post-local buckling degradation in strength and stiffness can be implicitly considered in the stress-strain model of steel fiber elements. The confinement effect, a phenomenon of strength and ductility enhancement for concrete materials due to bi-lateral compressive forces (Patel et al., 2014; Bai et al., 2016), and fatigue damage due to cyclic reversal results in stiffness degradation (Brünig and Michalski, 2020; Ding and Li, 2018), are coupled in the corresponding stress-strain model of concrete elements.…”