Test piece and method for shear capacity testing of steel-concrete interface shear connecting piece

Abstract

The invention discloses a test piece and a method for shear capacity testing of a steel-concrete interface shear connecting piece. The test piece comprises a steel plate, a concrete block, a stirrup and a shear connecting piece, and is characterized in that the number of the shear connecting piece is one, wherein the concrete block is cuboid and the cross section of the concrete block is square; the stirrup is a cuboid stirrup with a square cross section enclosed by a reinforcing steel bar; the stirrup is cast in the concrete block; the geometric center of the stirrup is overlapped with the geometric center of the concrete block; two opposite sides of the cross section of the stirrup are parallel with two opposite sides of the cross section of the concrete block; the concrete block is cast on the steel plate; the rod end of the shear connecting piece is welded to the steel plate; and the shear connecting piece is perpendicular to the steel plate and is positioned in the center of an interface of the steel plate and the concrete block. According to the test piece and the method, the influence of loading eccentricity can be corrected to achieve accurate shear capacity of a combined structure shear connecting piece; and the cohesion of the steel-concrete interface can be measured.

Description

technical field [0001] The invention relates to a test specimen and a method thereof for measuring the shear bearing capacity of a shear connector between steel and concrete interfaces. Background technique [0002] At present, the push-out test is generally used to test the shear force transfer between steel and concrete. When the push-out test is used to study the shear strength of the shear connectors, if the force of all the shear connectors in the push-out test piece can be guaranteed to be equal and loaded simultaneously , the test results can accurately reflect the mechanical performance of each shear connector. However, the test loading and the specimen itself are affected by many random factors, such as the deviation of the specimen, the compactness of the concrete around the shear connector, the deviation of the welding position of the shear connector, the difference in welding quality, and the loading eccentricity, etc. , making it difficult to ensure that the lo...

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Problems solved by technology

However, the test loading and the specimen itself are affected by many random factors, such as the deviation of the specimen, the compactness of the concrete around the shear connector, the deviation of the welding position of the shear connector, the difference in welding quality, and the loading eccentricity, etc. , making it difficult to ensure that the loads on each shear connector are exactly equal

At the same time, the requirements of the pressure testing machine and the size of the huge push-out test piece make the push-out test often limited by the test equipment, test site and funds, and it is difficult to measure the bond between the steel plate and the concrete with the ordinary push-out test piece

[0003]When the test piece is introduced to test the influence of the corrosion of the shear connector on the shear bearing capacity, due to the concrete material properties, current density, etc., it is difficult to ensure that each The corrosion degree of the shear connectors is the same, and the different degrees of corrosion lead to uneven force, so that the corrosion degree of the shear connectors bears a larger load and destroys faster, which affects the ultimate bearing capacity, so it is difficult to accurately judge the corrosion shear. True load-carrying capacity of force connectors

Moreover, the overall mass of the test piece is too large, so that the accuracy of the weighing instrument that meets the range is relatively rough, and it is difficult to use the weighing method to measure the loss of corrosion mass

It is therefore difficult to accurately measure the effect of corrosion on the shear transfer between steel and concrete

At present, there is no special test device and method for the shear force transfer of steel-concrete interface.

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