Testing apparatus used for testing bonding properties of steel bar-concrete under cyclic loading

Abstract

The invention provides a testing apparatus used for testing the bonding properties of steel bar-concrete under cyclic loading. The testing apparatus comprises fixed hinged supports, a movable hinged support, a middle joint hinge, thread circular steel columns and an upper part connection mechanical device, wherein the upper sides of the fixed hinged supports are fixed with a concrete test piece, the lower sides of the fixed hinged supports are fixed with a loading device, and the steel columns are arranged in the middle of the fixed hinged supports; the upper side of the movable hinged support is fixed with the concrete test piece and the lower side of the fixed hinged support is fixed with the loading device; the middle joint hinge is fixed at left and right sides of the concrete test piece for preventing the test piece from influence of other factors in tiny rotation under cyclic loading; a steel plate above the upper part connection mechanical device is connected with a counterforce device of a testing machine; a porous steel plate below the upper part connection mechanical device is connected with the two fixed hinged supports; and the steel plate is connected with the porous steel plate through a spherical hinge. The testing apparatus provided by the invention overcomes the problem that the stress states of steel bars and concrete in drawing and bonding testing under cyclic loading are not consistent with actual situations; and the testing apparatus can test the bonding properties of steel bar-concrete via a half-beam type test piece.

Description

technical field [0001] The invention belongs to the field of civil engineering and structural engineering, and relates to a test device for testing the bonding performance of steel bars and concrete under repeated loads. Background technique [0002] In reinforced concrete structures, reliable bonding is the basis for ensuring that the two materials, steel and concrete, work together. The bond performance of steel-concrete has been a fundamental issue in civil and structural engineering for a long time. Under repeated loads such as earthquakes and winds, the bonding performance between steel bars and concrete will decline with the loading process, thus endangering the safety of the structure. Therefore, it is necessary to test the bonding parameters between steel bars and concrete by means of experiments for structural design and analysis. [0003] At present, the bond performance test between steel bar and concrete under repeated load is mainly carried out by pull-out tes...

AI Technical Summary

Problems solved by technology

Studies have shown that the stress state will have a greater impact on the bonding performance, and the applicability of the results of the test conducted under the non-true stress state will be limited

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