Hydraulic fixing device used for measuring bond properties of steel bar with concrete

Abstract

The invention discloses a hydraulic fixing device used for measuring bond properties of a steel bar with concrete. According to the hydraulic fixing device, a base plate, a top plate, and two side plates of an outer frame are all made of steel plates, and are welded together so as to form an integral body; the top plate is provided with a connecting bolt; the connecting bolt is connected with a load transducer; the middle part of the base plate is provided with a U-shaped groove; the middle part of the steel bar is arranged in a concrete test block, the upper part of the steel bar stretches out from the top of the concrete test block, and the lower part of the steel bar stretches out from the bottom of the concrete test block; the concrete test block is placed on the base plate, so that the lower part of the steel bar penetrates through the U-shaped groove and stretches out through the base plate; an upper backing plate is provided with a through hole, and is arranged on the top of the concrete test block; the upper part of the steel bar penetrates the through hole of the upper backing plate, and stretches upwards through the upper backing plate; and the bottom of a hollow jack is arranged on the upper backing plate, and the top of the hollow jack is pressed against the top plate. The hydraulic fixing device is suitable for site tests, is simple in structure, and is convenient for dismounting; and required materials and devices are few.

Description

technical field [0001] The invention relates to a hydraulic fixing device for measuring the bonding performance of steel bars and concrete, which belongs to the field of concrete construction. Background technique [0002] In the field of civil engineering, the bonding performance between steel bars and concrete is the prerequisite for the bearing of reinforced concrete structures or components. In existing projects, there are many slippages due to the bond degradation between steel bars and concrete, which eventually lead to major engineering accidents. Bonding of reinforced concrete structures is of great significance in engineering practice. The degradation of bonding is the main reason for the decrease of component strength, the degradation of stiffness and the increase of deformation. [0003] CN 102539319 A discloses a test device and a test method for directly measuring the dynamic bonding performance of concrete and steel bars under reciprocating loads. The concret...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to fix the concrete test piece when the steel bars on both sides of the concrete test piece are exposed to the bond performance test of the concrete, so that the concrete test piece is evenly stressed when it is fixed, especially around the steel bar. The concrete is evenly stressed to solve the vertical displacement problem of the concrete specimen itself during the test

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