Experimental study on friction loss of steel strand of pre-tensioned prestressed beam

pretensioned steel strand;  friction loss;  tension control stress;  bending angle;  bender;  Anti-friction sheets

The bender is to realize the friction loss of the prestressed ribs after passing through the bending at 13° of the prestressed reinforcement of the pre-tensioned line, analyze the main factors affecting the friction loss of the steel strand, and put forward the calculation method and related suggestions of the friction loss of the prestressed rib of the bender used in the test. The test results show that the friction loss of the steel strand is proportional to the bending angle and linear with the tension control stress, and the extrusion stress of the steel plate above the hole of the steel strand of the bender is only 2.1% of the tension control stress, indicating that the bender has a reliable strength and safety guarantee basis.