Mechanical Properties of Simply Supported Prestressed Concrete Beams under Repeated Over-Loadings

Abstract

Results of an experimental investigation on the mechanical behavior of simply supported prestressed concrete beams under repeated over-loading are described. This load was characterized by higher maximum load near the failure and the relatively slow loading velocity counting at most 100 cycles to the failure. Differences between the dynamic properties of grouted beams and of non-grouted beams under these loadings are also discussed. Test results give many interesting suggestions for the theoretical approach on the load-deformation relation of prestressed concrete baems subject to repeated over-loadings. It must be noticed that the deformation-dependent change of dissipated energy for the prestressed concrete beam is quite different from that for steel structure and of U-shaped curves.