Experimental and Analytical Study on Strengthening of Reinforced Concrete T-Beams Using External Prestressing
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A parametric study was carried out to investigate the structural behavior of reinforced concrete T beams under different external prestressing conditions. This paper adopted two external prestressing methods; to study and to compare the behaviour of externally prestressed tendons that is, 12 mm diameter steel bars and 12.7 mm steel strands by strengthening T-shaped reinforced concrete (RC) beams which is subjected to static loads. The influences of concrete strength, reinforcement ratio of the non-prestressed tensile steel bars and prestressing force on the these tendons in terms of ultimate load and load deformation were examined. The test results revealed that, compared with unstrengthened RC beams, the specimens externally strengthened with prestressed steel bars or steel strands showed a better performance in load carrying capacity. After that the better prestressing method was modelled and validated by finite element software ANSYS. It can provide a reference for the further promotion of the structure.