Damage quantitative evaluation method of reinforced concrete test piece

Abstract

The invention relates to a damage quantitative evaluation method of a reinforced concrete test piece. The damage quantitative evaluation method comprises the following steps: step I: pouring a test piece; step II: performing the pretreatment before the test; step III: connecting an induction system to a dynamic strain gauge, and performing pre-loading; step IV: applying the load according to a predetermined repeated loading rule, recording stress-strain data, reading residual strain on the surface of the concrete after a unloading standing target time after the test is ended, and calculating the residual strain (shown in description) of the concrete at the initial tensile fatigue damage state, accumulated residual strain sigma rc of the concrete at an initial state of the tensile fatigue damage corresponding to the tensile damage of the concrete and the residual strain sigma r of the concrete after N times of circulation of the tensile fatigue load; and step V: quantifying the damage quantitative of the single-axis tensile concrete by adopting a residual strain method according to the consistence of a damage development rule and a fatigue deformation rule of the concrete. The damage quantitative evaluation method of the reinforced concrete test piece is simple in operation and high in test stability.

Description

technical field [0001] The invention relates to the technical field of research on properties of damaged concrete materials, in particular to a damage quantitative evaluation method for reinforced concrete specimens. Background technique [0002] Concrete structures in the service process work under the joint action of load and environment, and the research results of concrete durability under no load cannot reasonably reflect the actual state of the structure. Concrete structures are often subjected to erosion such as seawater, deicing salt, and carbon dioxide while bearing loads. Under the coupling effects of load and environmental factors or multiple factors, concrete structures often fail before reaching the design life. The huge economic loss and casualties caused by it have aroused widespread concern both at home and abroad. Concrete is a typical porous material, and the corrosive medium invades the interior of the concrete through the pores of the concrete, which lea...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiency that existing current test methods cannot complete the axial tensile damage test of concrete under repeated loading, the present invention provides a damage quantitative evaluation method for reinforced concrete specimens that is easy to operate and has high test stability

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