An experimental study on dynamic ultimate limit states of prestressed concrete and prestressed reinforced concrete beams under high speed loading

摘要

This paper presents an experimental study on the dynamic ultimate limit states of prestressed concrete (PC) and prestressed reinforced concrete (PRC) beams under high speed loading. First, the static and high speed loading tests were performed for the PC and PRC beams with different bond conditions, respectively. It was found from the tests that the ultimate deformations of unbonded PC and PRC beams become about 1.6-2.6 times larger than those of the bonded PC and PRC beams under high speed loading. Second, it was also noted that the ultimate deformations of bond PRC beams are in general about 30% larger than those of PC beams with the same flexural strength. Finally, it was found from the PC tendon strain distributions that the unbond condition of PC tendon influences remarkably on the ultimate deformations of unbond PC and PRC beams.