EXPERIMENTAL STUDY OF DUCTILILY OF PRESTRESSED HIGH-STRENGTH CONCRETE BEAMS

Experimental results about ductility of 24 prestressed concrete beams under static test are presented. For the test beams, the grade of concrete strength is from C40 to C80, the prestress ratio is from 0.6 to 1.0; the reinforcement index is from 0.17 to 0.32; and the uniform extended ratio of strand is 3.6% and 5.0%. The analysis of load deflection relationship of test beams is conducted. The effects of the concrete strength, the extended ratio of strand, the prestress ratio, and the reinforcement index on the displacement ductility and the failure states of prestressed concrete beams are studied. Design suggestions are proposed.