Hybrid fiber reinforced concrete elastic-plastic constitutive model and construction method thereof

Abstract

The invention discloses a hybrid fiber reinforced concrete elastic-plastic constitutive model and a construction method thereof. Based on a uniaxial and true triaxial press test result, the hybrid fiber reinforced concrete three-dimensional space failure criterion, the intensifying / softening criterion and the non-associative plastic flow rule are determined through a corresponding stress-strain (axial strain, lateral strain and volumetric strain) relation curve considering the influences of different fiber types, fiber volume contents and draw ratios, and the incremental type hybrid fiber reinforced concrete elastic-plastic constitutive model reflecting fibration is constructed. The model can accurately describe the mechanical behaviors including multiaxial strength, strain strengthening and softening, constraint sensitivity and plastic flow non-relevancy and has high applicability and extensibility.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an elastic-plastic constitutive model of hybrid fiber concrete and a construction method thereof. Background technique [0002] Since the end of the last century, fiber-reinforced concrete has attracted widespread attention due to its superior mechanical properties, especially hybrid fiber-reinforced concrete, whose mechanical properties tend to be superior due to the effect of fiber hybridization. So far, many scholars at home and abroad have carried out a lot of research in this field and achieved rich research results, but most of the existing research is experimental research, and initially explored the effect of adding one or two specific fibers on the fiber. The influence of the mechanical properties of concrete materials, the research on the constitutive relationship of hybrid fiber reinforced concrete is relatively limited. Therefore, this limits th...

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Problems solved by technology

So far, many scholars at home and abroad have carried out a lot of research in this field and achieved rich research results, but most of the existing research is experimental research, and initially explored the effect of adding one or two specific fibers on the fiber. The influence of the mechanical properties of concrete materials, the research on the constitutive relationship of hybrid fiber reinforced concrete is relatively limited. Therefore, this limits the extent and depth of research in this field to a large extent, which is not conducive to the further promotion of hybrid fiber reinforced concrete materials.

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