Experiment on installment tension technology of prestressed concrete beams

In order to analyze the influence of installment tension technology on concrete beam prestress loss, bearing capacity and deflection characteristics, aimed at post-tensioned prestressed concrete beam, experimental research on installment tension technology of rectangular prestressed concrete beams was carried out considering the influence of concrete ages and tension methods. Taking the rectangular concrete beams into two groups, one group was tensioned by stages at 4 d, 8 d and 12 d of concrete ages respectively and the other was tensioned once at 28 d of concrete age. Then the continuous thirty days' prestress loss monitoring was processed, and the reciprocating bearing capacity, deflection and failure mode of concrete beams were analyzed. The results show that the prestress loss of concrete at later period can be reduced by prestessed installment tension at early ages while the cracking load and yield load of concrete beams are improved without affecting the bending ductility failure form. © 2015, Xi'an Highway University. All right reserved.