Effect of External Post-Tensioning Strengthening Technique on Flexural Capacity of Simple Supported Composite Castellated Beam

This research is carried out to study the effect of external post-tensioning technique on flexural capacity simply supported composite castellated beam experimentally. In this research, seven beams having same dimensions and material properties were cast tested up failure by applied two concentrated loads at 700 mm from each end. Two strands 12.7 diameter fixed side web strengthening located depth 180 top fiber section (dps) end beam. The have been tensioned using a hydraulic jack with constant stress 100 MPa. aims different shapes strand profiles techniques These divided into three groups. Each group contained while 7th kept without As control first included straight profile Post-tensioning. second triangular post-tensioning. third trapezoidal All supported, all them fully shear connections between concrete slab steel girder. 16 openings stiffened six stiffener plates welded beams. Three are web. these middle beam, four locations under loads. experimental results increasing 5.43% in load an average beams, 18.92% 20.71% above compared