Establishment method for fiber mixed concrete compressive strength destroying rule

Abstract

The invention discloses an establishment method for a fiber mixed concrete compressive strength destroying rule. The establishment method is based on a classic W-W five-parameter model, and comprises the following steps: using a special parameter demarcating method, introducing influence coefficients eta t and eta c of deviatoric stress which is applied by fiber to pull and compress meridian lines, and then fitting the influence coefficients with a fiber characteristic value lambda f to finally obtain the compressive strength destroying rule which is applicable to the fiber mixed concrete. The method is mature in theoretic foundation, clear in principal introduction, convenient in computation step, particularly strong in applicability, and applicable to determination of compressive strength destroying yield surfaces of concrete doped with various fibers in a plurality of doping manners and can obtain the result meeting the requirements for scientific research or engineering application.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for establishing a failure criterion of compressive strength of hybrid fiber concrete. Background technique [0002] Since the end of the last century, fiber reinforced concrete has been widely used due to its superior strength and deformation properties, especially hybrid fiber reinforced concrete, which often exhibits superior mechanical properties due to the hybrid effect of fibers. So far, many scholars at home and abroad have conducted a lot of research on the mechanical properties of hybrid fiber reinforced concrete structures or components, and achieved rich research results. However, due to the limited research scale, the conclusions obtained are often only applicable to the corresponding structures or components. In order to further promote the application of hybrid fiber reinforced concrete, it is necessary to conduct in-depth constitutiv...

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Problems solved by technology

[0003] In order to solve the above-mentioned technical problems, the present invention overcomes the ubiquitous failure criterion of the compressive strength of existing concrete materials, mostly for ordinary or single fiber concrete, and mostly empirical or semi-empirical formulas, lacking reliable theoretical basis, and the physical meaning of parameters It is not very clear and cannot be directly applied to hybrid fiber concrete materials, resulting in the problem that the established strength failure criteria are often not adaptable. A hybrid fiber concrete compression strength failure criterion is proposed

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