Abstract
Detennining the constitutive model is a key procedure in numerical simulation of concrete structures. The uniaxial stress-strain curve is important information to determine the concrete constitutive model. This paper provided a simplified stress-strain curve of concrete that can be used in simulation. The comparison between Chinese Code and the simplified curve shows that the simplified curve of uniaxial compression is close to the code value. Numerical simulation of concrete beams show that the simplified curve proposed has high computational efficiency and good convergence.
Highlights
Large-scale FEM software, such as ABAQUS, ANSYS, etc, has been used in various fields
In a numerical simulation analysis, the uniaxial stress-strain curve is an important information to define the constitutive model of material, which affects the accuracy and efficiency of the analysis
The corresponding expressions are given in Chinese Code for Design of Concrete Structures[6]
Summary
Large-scale FEM software, such as ABAQUS, ANSYS, etc, has been used in various fields. In a numerical simulation analysis, the uniaxial stress-strain curve is an important information to define the constitutive model of material, which affects the accuracy and efficiency of the analysis. Some different uniaxial sterss-strain expressions were proposed in researches on mechanical properties of concrete[1,2,3,4,5]. The corresponding expressions are given in Chinese Code for Design of Concrete Structures[6]. The researcher and engineer must modify the stress-strain curve for structural simulation in FEM, such as a simulation with Concrete Damaged Plasticity Model (CDP model) in ABAQUS. Convergence and convenience of simulation, a more simple and convenient expression based on Chinese code was proposed in this paper
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