Measuring sensor for measuring bond slip at interface between structural steel and concrete and measuring method thereof

Abstract

The invention, which belongs to the field of civil engineering, relates to a measuring sensor for measuring the bond slip at an interface between a structural steel and concrete and a measuring methodthereof. With the measuring sensor, the bond slip between the structural steel and the concrete can be measured conveniently and accurately and the bonding stress and bond slip at the interface can be obtained. The measuring sensor is mainly composed of a special spring steel disc, a strain gauge, force transmission fixtures, a flatheaded rounded limit rod, an inverted-U-shaped metal housing, a rectangular metal housing, a metal housing in a shape like a Chinese character "tu" and wires. Two resistance strain gauges are pasted to the front side and the rear side of the special spring steel disc respectively; and a thin wire is welded to each o resistance strain gauge. The two force transmission fixtures are fixed at the front side and the rear side of the special spring steel disc by rivets to form a core measuring element; the core measuring element is inserted into a measuring box formed by three metal housings; the metal housing in a shape like a Chinese character "tu" is fixed bya screw and is installed at a to-be-measured interface that has been drilled and is provided with the flatheaded rounded limit rod to form a measuring sensor. The measuring sensor and the measuring method have advantages of clear principle, high flexibility, linearity, reasonable and adjustable measuring range, simple processing and manufacturing, great convenience in mounting; and great easinessin operation; and a problem that the bond slip at the interface between the structural steel and the concrete is difficult to measure is solved.

Description

technical field [0001] The invention belongs to the field of civil engineering, and relates to a test and measurement device, in particular to a bonded slip measurement sensor and a measurement method for the interface of a steel-concrete composite structure, which are used to measure the relative slip at the interface between the steel and concrete, and then establish the steel The mechanical model of bond-slip at the interface with concrete is used to study the mechanical properties of bond-slip at the interface of the composite structure. Background technique [0002] In the steel-concrete composite structure, the bond between the steel and the concrete is the premise to ensure that the two work together, so as to realize the stress transfer between the steel and the concrete, which is the same as the bond between the steel bar and the concrete in the reinforced concrete structure. Slip is similar, and it is precisely because of the existence of this bond that steel and c...

AI Technical Summary

Problems solved by technology

These methods cannot directly measure the internal bond-slip characteristics very well, and there are many empirical formulas in actual calculations, which still do not essentially better reflect the bond-slip performance at the interface of the combined structure. Therefore, the bond-slip characteristics at the interface between steel and concrete are studied, and the relative slip and bond stress distribution at the internal interface between steel and concrete are obtained, and a reasonable bond-slip constitutive model is established. It is of great significance to design shear connectors and analyze their influence on the mechanical performance of structures in numerical simulation.

Images