Experimental apparatus and an experimental method for the negative bending moment zone of a continuous beam to bear load under chloride environment

An experimental apparatus for a negative bending moment zone of a continuous beam to bear load under chloride environment, comprising:

• a high-rigidity main frame, wherein the high-rigidity main frame comprises an I-steel base, auxiliary bases, a left steel column, a right steel column, a square steel top beam, a left support bracket, a right support bracket, a left reaction force bracket, and a right reaction force bracket;
• two opposite ends of the I-steel base are fixedly connected with the auxiliary bases respectively, the left steel column and the right steel column are vertically arranged on the auxiliary bases respectively and spaced from each other, and two opposite ends of the square steel top beam are respectively arranged on ends of the left steel column and the right steel column facing away from the auxiliary bases;
• the left support bracket and the left reaction force bracket are arranged on the left steel column and slidable between the I-steel base and the square steel top beam along the left steel column in a vertical direction, and the left support bracket is located below the left reaction force bracket;
• the right support bracket and the right reaction force bracket are arranged on the right steel column and slidable between the I-steel base and the square steel top beam along the right steel column in the vertical direction, the right support bracket is located below the right reaction force bracket;
• a loading system, wherein the loading system comprises a hydraulic jack, a load sensor and a load display;
• a bottom of the hydraulic jack is fixedly connected with the I-steel base, a top of the hydraulic jack is connected with the load sensor, and the load sensor is electrically connected to the load display;
• an erosion system, wherein the erosion system comprises an erosion capacity box with a scale, and the erosion capacity box is made of a transparent material;
• and
• a test beam, wherein the test beam is a continuous beam that meets design requirements, one end of the test beam is detachably arranged between the left support bracket and the left reaction force bracket, and another opposite end of the test beam is detachably arranged between the right support bracket and the right reaction force bracket;
• a top of the load sensor is in contact with the test beam and thereby the hydraulic jack and the load sensor are located between the I-steel base and the test beam;
• a bottom of the erosion capacity box is glued onto a negative bending moment zone of the test beam and thereby the erosion capacity box is located between the test beam and the square steel top beam, and the erosion capacity box is configured to supply a chloride solution to erode the negative bending moment zone of the test beam.