Study On The Impact Of Layouts Of The Prestressed Steels On The Stress Behavior Of The UPC Beams With High Strength Reinforced Steels

As tensile non-prestressed steels, the rebar Graded HRB500not only can play it’s mechanical properties roles but also can improve UPC beams’ flexural behavior, when it is used in UPC beams. And the rebar Graded HRB500can improve UPC beams’ ultimate bearing capacity and prestressed steels, ultimate stress increment. This can solve the problem of UPC beams’lower ultimate bearing capacity. The layout of the prestressed steels is one of the factors affecting stress behavior of UPC beams. However, most researchers rarely took this factor into account seriously. In this text, we study the UPC beams flexural performance by carrying out a test study and the theoretical analysis, which have high strength reinforced steels and different layouts of the prestressed steels. The research results are helpful to the promotion of UPC beams.We design six UPC beams. We analyze the impact of the strength grade of the tensile non-prestressed steels and the layout of the prestressed steels on the ultimate bearing capacity and ultimate stress increment and midspan deflection of UPC beams by the test. We also analyze the cracks’development and distribution of test beams after cracks appear.The test results show that HRB500steels improve UPC beams’ultimate bearing capacity and ultimate stress increment. The layout of the prestressed steels not only has an effect on the ultimate bearing capacity, but also affects the ultimate stress increment of UPC beams. The UPC beams with tendons of parabolic curve profile have lower ultimate bearing capacity than that with tendons of straight curve profile, but the former’prestressed steels have higher ultimate stress increment than the latter’prestressed steels. The UPC beams with tendons of parabolic curve profile has lower whole rigidity than that that with tendons of straight curve profile, and they have lower deflection under the same load. We discover that UPC beams with the prestressed steels in the form of parabolic curve profile is superior to that with the prestressed steels in the form of straight curve profile in controlling the cracks’width and distribution.