Method for recognizing cross-section bending moment and curvature relation of reinforced concrete beam

Abstract

The invention discloses a method for recognizing the cross-section bending moment and curvature relation of a reinforced concrete beam. The method includes: using macroscopic displacement measured by a bending member for recognizing the cross-section bending moment and curvature relation of the reinforced concrete beam, namely, using the load-displacement relation under loads at each level, combining a conjugate beam method, and recognizing the cross-section bending moment and curvature relation of the bending member by a least square method, so that analysis of nonlinear bending member mechanical properties is benefited. The method has the advantages that the cross-section bending moment and curvature relation of the bending member is recognized accurately, so that corresponding materials can be selected accurately according to engineering structure forms, and the member can be designed reasonably.

Description

technical field [0001] The invention relates to the technical field of structural testing, in particular to a method for identifying the bending moment curvature relationship of a reinforced concrete beam section. Background technique [0002] Reinforced concrete structures are widely used in engineering, such as industrial and civil buildings, road engineering, bridges, water conservancy projects, underground engineering, etc., are widely used in this form of structure. With the development of economy, science and technology and the continuous improvement of social needs, researchers began to explore and develop steel-concrete composite structures with better mechanical properties (such as built-in T-shaped or steel box girders, etc.) and other new material components (such as fiber Reinforced composite materials - concrete structural members, etc.). The working principle of these components is similar to that of reinforced concrete components, that is, to make full use of...

AI Technical Summary

Problems solved by technology

However, due to the discreteness of materials and the limitation of measurement errors and measured data, there are certain errors in the obtained constitutive relations; the slip and friction between the contact surfaces of combined materials will also affect the actual stress-strain relationship of each layer of materials, These factors affect the section to a certain extent The reliability and accuracy of the relationship curve will affect the mechanical performance analysis of components and its application in engineering. It is impossible to accurately select corresponding materials and rationally design components according to the form of engineering structures.

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