Valuing method of plastic constitutive parameters of steel-polypropylene hybrid fiber concrete in ABAQUS

Abstract

The invention discloses a valuing method of plastic constitutive parameters of steel-polypropylene hybrid fiber concrete in ABAQUS. The method sufficiently considers influences on mechanical properties of concrete, caused by factors including different fiber types, volume fractions, long-diameter ratios and the like, and related parameters of a built-in concrete damage plasticity model (CDPM) in the ABAQUS are properly revised, so that the related parameters can be more accurately matched with a yield criterion, a hardening rule and a flowing law of the steel-polypropylene hybrid fiber concrete, and a very good reference is provided or refined non-linear analysis of a fiber concrete structure under a complicated stress state.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an ABAQUS-based method for obtaining values ​​of plastic constitutive model parameters of steel-polypropylene hybrid fiber concrete. Background technique [0002] Since the beginning of this century, fiber reinforced concrete has developed rapidly. In order to accurately determine its true constitutive model, scholars at home and abroad have conducted a lot of research and proposed stress-strain mathematical expressions under various loading conditions, and applied them to Into the finite element simulation analysis, but the simulation results often can not reflect the nonlinear stress behavior of fiber reinforced concrete, such as the change of mechanical properties such as matrix multiaxial strength, volume deformation, hysteretic energy consumption after the fiber is added cannot be obtained better performance. At present, the large-scale general-purpos...

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Problems solved by technology

[0002] Since the beginning of this century, fiber-reinforced concrete has developed rapidly. In order to accurately determine its true constitutive model, scholars at home and abroad have conducted a lot of research and proposed stress-strain mathematical expressions under various loading conditions, and applied them to Into the finite element simulation analysis, but the simulation results often can not reflect the nonlinear stress behavior of fiber reinforced concrete, such as matrix multiaxial strength, volume deformation, hysteretic energy consumption and other mechanical properties changes after the addition of fibers cannot be obtained better performance

At present, the large-scale general-purpose finite element software ABAQUS is widely used for its powerful simulation function, among which, its built-in concrete damage plasticity model (CDPM) plays a key role in the mechanical performance analysis of ordinary concrete structures, but for fiber reinforced concrete, Especially for hybrid fiber concrete, the model is not very applicable and needs to be further revised, but related work has not been reported so far, which limits the research depth of this field to a large extent, and is not conducive to hybrid fiber concrete. Further Popularization and Application of Concrete Materials

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