A Dynamic Elastoplastic Model of Concrete Based on a Modeling Method with Environmental Factors as Constitutive Variables

Abstract

This paper develops a modeling method with incremental stress-strain-environment constitutive model to predict the change in the plastic mechanical behavior of concrete caused by environmental action, and it regards the environmental factor as a constitutive variable, similar to stress and strain. The yield condition of the model is a function of stress, the plastic internal variable, and the environmental variable. The loading-unloading criterion is established in the space constructed by the strain and the environmental variable to determine the contribution of mechanical loads and environmental factors to plastic deformation. By considering the strain rate as an environmental factor and applying the proposed method, a stress-strain-strain rate constitutive model of concrete is developed to describe the plastic flow caused by the combined action of stress and strain rate. In addition, constant-and variable-strain rate loading tests are performed to evaluate the performance of the established model. In particular, the model's capabilities are further highlighted by comparing the simulation results of the dynamic stress-strain model and the proposed model under loading conditions with rapidly decreasing strain rates.

Fatigue Evaluation of CFST Arch Bridge Based on Vehicle–Bridge Coupling Vibration Analysis

“…The anchor underlay and arch ring steel pipe adopted Q345D, the suspenders were made of PES (FD) 7-121 galvanized low-relaxation prestressed steel wire rope, and the tie rod adopted a φ15.2 prestressed steel strand. Both the concrete and steel materials behaved in the linear elastic stage, the elastoplastic process and strain rate of the material were not considered [30], and all bridge components were considered to be damage-free during vehicle loading and unloading. The concrete and steel material parameters are shown in Tables 2 and 3.…”