Anisotropic Nonlinear Elastic Model of Concrete and Secondary Development in ABAQUS

Abstract

Abstract:In order to solve the convergence problem of concrete constitutive in the softening phase, an anisotropic nonlinear elastic constitutive model (ANECM) was proposed, which was developed based on the uniaxial concrete constitutive relation in the Chinese code for design of concrete structures (GB 50010-2010). The user material subroutine (UMAT) based on ANECM is developed in ABAQUS software. The above UMAT is applied to analyze a simulation model in ABAQUS software. The result shows that compared to the default plastic-damage concrete constitutive in ABAQUS, ANECM is an effective and appropriate model to simulate the performance of concrete and it has improved the convergence problem.

Parametric Study of Flexural Strengthening of Concrete Beams with Prestressed Hybrid Reinforced Polymer

“…The material model of concrete is available in the commercial software Abaqus (6.10). However, there are some limitations of the model in Abaqus, such as the convergence problem of concrete constitutive response in the softening phase [13]. In addition, the damage factor of concrete in the model of Abaqus is obtained by fitting the stress-strain curve of the test, which cannot truly reflect the relationship between plastic strain and the damage factor.…”

Study on the mechanical characteristics of sand pebble surrounding rock considering the disturbance effect of tunnel excavation

“…To quantitatively assess the mechanical property variations of sand and gravel soil for engineering applications, several scholars have utilized a blend of experiments and theoretical derivations to investigate soil stress conditions and mechanical parameters through soil constitutive models (Peng et al, 2019;Jia et al, 2021;Zhang et al, 2020). Although this method offers fresh perspectives on calculating the intricate mechanical properties of tunnel surrounding rock, traditional constitutive models are no longer adequate for practical engineering as engineering conditions grow more complex (Cui and Dong, 2018;Sun and Yan-sheng, 2018;Zhao et al, 2020). Concurrently, for a more comprehensive examination of the physical-mechanical properties of soil during construction disturbances, Xu explored the adaptation of the Duncan-Chang model using China's ISO standard sand (Xu et al, 2012).…”