Testing device for interface bond stress of steel reinforced concrete and manufacturing method

Abstract

The invention discloses a testing device for interface bond stress of steel reinforced concrete. The testing device comprises a universal testing machine and a testing device body, wherein the testingdevice body is connected with the universal testing machine; the testing device body comprises a testing piece fixing frame and a concrete test piece; the testing piece fixing frame comprises an upper pressing plate and a lower pressing plate; the upper pressing plate is distributed at the upper part of the concrete test piece; round through holes are formed in four corners and the center of theupper pressing plate respectively; the lower pressing plate is distributed at the lower part of the concrete test piece; bolts are longitudinally distributed in the round through holes in the four corners of the upper pressing plate respectively; a pulled steel bar is vertically distributed in the round through hole formed in the center of the upper pressing plate. The invention further provides amanufacturing method of the testing device for the interface bond stress of the steel reinforced concrete; the manufacturing method comprises the following steps: treating the pulled steel bar; fixing the pulled steel bar; pouring the concrete test piece; mounting the testing piece fixing frame. The testing device disclosed by the invention is simple in structure and high-precision test of the bond pre-stress of the concrete is realized.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a reinforced concrete interface bonding stress testing device and a manufacturing method. Background technique [0002] Reinforced concrete structures are loaded by two materials with different properties, steel and concrete, and their ability to work together is mainly due to the effective bonding between the two. This bond enables the transfer of stress at the interface between the steel and concrete, thereby establishing the working stresses necessary for the load bearing of the structure. Therefore, the bond between steel and concrete is the basic premise of the two working together. [0003] The bonding problem of reinforced concrete structures is not only of great significance in theory, but also in engineering practice, such as the anchorage, lap joint and extension of steel bars, etc. One of the main purposes of the detail structure design of steel bars is to o...

AI Technical Summary

Problems solved by technology

When the reinforced concrete member is subjected to load, in some parts of the member or structure, there will be relative slippage between the steel bar and the concrete, which will cause cracks in the member or excessive corners at the joints, which will affect the normal use of the structure. It will affect the bearing capacity of the structure and cause the structure to be damaged; especially when the steel bars in the concrete are corroded, it will not only cause the decline of its own mechanical properties and cause the cracking of the surrounding concrete, but also reduce its ability to work with the concrete and aggravate the structure. or component failure, the ductility is also weakened; therefore, the bonding problem is a problem that has attracted the attention of academia and engineering circles very early

This situation is concentratedly reflected in the two completely different methods of dealing with the bonding problem in the current reinforced concrete structure codes of various countries. Many countries require the calculation of the bonding stress, but the value standards of the bonding strength are inconsistent; the other It does not calculate the bond stress at all, but gives a very general structural requirement on the basis of the test; therefore, it is necessary to design a reinforced concrete interface bond stress test device

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