Elastoplastic constitutive model of steel fiber reinforced concrete considering fiber slippage and construction method thereof

Abstract

The invention provides an elastoplastic constitutive model of steel fiber reinforced concrete considering fiber slippage. The elastoplastic constitutive model of the steel fiber reinforced concrete is characterized in that the model is as shown in the following formula. According to the elastoplastic constitutive model of the steel fiber reinforced concrete considering fiber slippage disclosed by the invention, composite material mixing theories are used, and steel fiber and matrix concrete constitutive equations are respectively obtained based on a thermodynamic dissipation inequation. Matrix concrete is the elastoplastic constitutive model, and steel fibers are one-dimensional elastic constitutive models considering fiber interface slippage. The plasticity of the matrix concrete adopts Hsieh-Ting-Chen four-parameter yield criteria and Drucker-Prager classic plastic flow rules, and plastic hardening / softening criteria adopt a modified Guo Zhenhai model. The parameters of the steel fiber one-dimensional elastic constitutive model considering an interface are determined through a steel fiber pullout test. The parameters of the concrete elastoplastic constitutive model can be calibrated by uniaxial and true three-axial compression tests. The model considers a steel fiber slip mechanism in the meso-scale, and combines elastic constitutive structures of the ordinary concrete and the steel fibers to construct the elastoplastic constitutive model of the steel fiber reinforced concrete, thereby being simple and feasible, and having important promoting significance to basic theoretical research of the fiber reinforced concrete.

Description

An elastic-plastic constitutive model of steel fiber reinforced concrete considering fiber slippage and its construction method technical field The invention belongs to the technical field of building materials, and in particular relates to an elastoplastic constitutive model of steel fiber concrete considering fiber slippage and a construction method thereof. Background technique For nearly half a century, steel fiber reinforced concrete has been widely used in building construction, pavement, railway track, airport runway, tunnel lining, dam and other engineering fields due to its superior mechanical properties. The accurate description of the constitutive model of steel fiber reinforced concrete is of great significance to the mechanical properties, nonlinear analysis and safety evaluation of steel fiber reinforced concrete structures or components. The constitutive relationship models of steel fiber reinforced concrete currently established are mostly numerical constit...

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Problems solved by technology

The constitutive relationship models of steel fiber reinforced concrete currently established are mostly numerical constitutive equations based on macroscopic test results, which do not reflect the reinforcement mechanism of steel fibers on concrete at the mesoscopic scale.

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