In-service structure prestress detection method based on resistance strain effect

Abstract

,The invention relates to the technical field of prestress detection, in particular to an in-service structure prestress detection method based on a resistance strain effect. The method comprises the steps of obtaining the resistivity of a prestressed steel strand of a prestressed concrete structure under effective prestress, calculating the original resistance of the prestressed steel strand according to the resistivity of the prestressed steel strand, the design length of the prestressed steel strand and the strain under the design tension; measuring the actual resistance of the prestressed steel strand under the effective prestress, and calculating the effective prestress of the prestressed steel strand according to the original resistance of the prestressed steel strand, the actual resistance under the effective prestress, and the corresponding relation between the resistance and the strain and the corresponding relation between the strain and the stress. According to the in-service structure prestress detection method based on the prestress steel strand resistance strain effect, effective prestress nondestructive detection of an in-service prestress concrete structure can be achieved, and the prestress detection precision can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of prestress detection, in particular to an in-service structure prestress detection method based on the resistance strain effect. Background technique [0002] In the field of civil engineering, prestressed concrete structures have been widely used. Among them, the prestressed steel strand is the key stress member of the prestressed concrete structure, and its health directly affects the durability and safety of the structure. During the construction and operation phase of the bridge, affected by factors such as material performance, construction status and environmental conditions, the prestressed concrete structure will produce prestress loss, which will reduce the prestress level of the structure and uneven distribution of prestress, which will affect the working performance of the structure. Once the prestressed concrete structure fails, it will bring huge safety hazards to the structure. Therefore, i...

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Problems solved by technology

[0006] To sum up, although there are many researches on effective prestress detection of structures, most of the detection methods proposed are not suitable for in-service structures, and the few methods that can be used for effective prestress detection of in-service structures have low accuracy. , high cost, low signal-to-noise ratio, etc.

However, the applicant has found in actual research that the prestressed steel strand is a metal conductor, and the resistance of the metal conductor will change under the influence of deformation and temperature (resistance strain effect)

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