Measurement Sensor And Measurement Method For Measuring Bond-Slip At Steel-Concrete Interface

A measurement sensor for measuring bond-slip at a steel-concrete interface (SCI), wherein the measurement sensor can conveniently and accurately measure bond-slip between steel and concrete, and obtain bond stress and bond-slip at a steel-concrete interface;

• the measurement sensor comprises a core measurement element, a measurement box, and two flat-head rounded-corner limiting rods (5);
• the core measurement element is inserted into the measurement box;
• and the core measurement element is located between the two flat-head rounded-corner limiting rods (5);
• the core measurement element comprises a spring steel sheet (1), two electric resistance strain gauges (2), and two force transmission clamps (3), wherein the two electric resistance strain gauges (2) are respectively bonded on the front and back sides in the middle of the spring steel sheet (1), each electric resistance strain gauge (2) is connected to a data acquisition instrument through a wire (14), and the wires (14) are led out from a wire leading hole (13) on a to-be-measured contact surface (11);
• the force transmission clamps (3) are respectively fastened on the front and back sides of the spring steel sheet (1), a protruding structure is designed in the middle of each force transmission clamp (3), and a distance between two protruding points of the two force transmission clamps (3) is D;
• and a reversed deformation space is kept between the spring steel sheet (1) and 7C-shaped transmission force clamps;
• the measurement box comprises a Π-shaped metal jacket (6), two rectangular metal jackets (7), two inverted T-shaped metal jackets (8), and screws (9) with spring rings, wherein two sides of the Π-shaped metal jacket (6) are connected to the two rectangular metal jackets (7) through the screws (9), the bottom of the rectangular metal jackets (7) is rigidly connected to the upper part of the inverted T-shaped metal jackets (8), and the bottom of the metal jackets (8) and the to-be-measured contact surface (11) are sealed through sealant;
• a rectangular groove is provided for insertion of the core element on each of an upper inner wall of the Π-shaped metal jacket (6), the inner wall of the rectangular metal jackets (7), and the inner wall of the inverted T-shaped metal jackets (8);
• the wire leading hole (13) is provided on the to-be-measured contact surface (11), two threaded holes (12) used for fastening the flat-head rounded-corner limiting rods (5) are provided on two sides of the wire leading hole (13), the two threaded holes (12) and the wire leading hole (13) are arranged along a direction of to-be-measured bond-slip;
• and a distance between the two threaded holes (12) is D.