Device and method for testing bond performance between reinforced bar and concrete under repeated load

Abstract

The invention relates to the technical field of construction engineering test and detection, in particular to a device and method for testing the bond performance between a reinforced bar and concreteunder repeated load. The device comprises a loading frame and a strain sensor mechanism; the loading frame comprises an upper loading plate and a lower loading plate, screw rods, a force transmissionplate, a ball joint assembly and a connecting rod, wherein the four corners of each one of the upper loading plate, lower loading plate and force transmitting plate are provided with screw rod holes,the screw rods penetrate through the screw rod holes respectively and are connected to form the integrated loading frame through fastening nuts cooperatively arranged on the screw rods, the strain sensor mechanism comprises a loading end deformation sensor mechanism, a free end deformation sensor mechanism and a test piece sensor mechanism. The device and method for testing the bond performance between the reinforced bar and the concrete under the repeated load have the advantages that the structure is simple, the installation and detachment of a test piece and the test operation are convenient, the precise control can be achieved, and accurate test data and results can be obtained through the loading control of a multi-function electro-hydraulic servo test machine and an existing data acquisition technology.

Description

technical field [0001] The invention relates to the technical field of construction engineering testing and detection, in particular to a device and method for testing the bonding performance of reinforcement and concrete under repeated loads. Background technique [0002] In the concrete structure, the good bonding performance between the reinforcement and concrete is the key to ensure the effective cooperation of the two different materials, the reinforcement and the concrete. The reinforcement is usually steel and fiber composite polymer reinforcement. Calculation, analysis of cracks, deformation and failure modes and other mechanical properties are of great significance, so they have long attracted the attention of scientific research and engineering technicians. A lot of research has been carried out on the bonding mechanism, failure mode, bond strength and slip performance and its influencing factors between reinforcement and concrete under unidirectional loads. In act...

AI Technical Summary

Problems solved by technology

Although the device of this invention can be used to detect the bonding performance between the reinforcement and the concrete matrix under repeated loads, it has the following problems: First, it lacks a deflection correction mechanism. The second is that the thread loading method will cause the reinforcement to be torsion, which will further increase the test error, especially the impact on the fiber composite polymer reinforcement is greater; the third is whether the specimen installation, reinforcement clamping, or loading The operation process is cumbersome, laborious and time-consuming, resulting in low test efficiency, and it is difficult to achieve precise test control and obtain accurate test results

Images