SEISMIC BEHAVIOR OF POST-TENSIONED BEAMS

Date

2024-7-26

Author

Karageyik, Can

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Post-tensioning is an effective alternative for beams of long span moment resisting frame systems. Such frames are designed by using the behavior factors given for conventional reinforced concrete structures under the assumption of similar ductility levels. In this study, the behavior of post-tensioned beams was experimentally investigated to evaluate their ductility ranges for seismic resistance. For this purpose, an exterior post-tensioned beam-column joint was selected from a code compliant designed prototype frame building to produce 1:2 scaled specimens. The key test variables were the presence of prestressing and the ratio of mild reinforcement. Test results demonstrate that ductility is affected by amount of mild reinforcement and presence of prestress, therefore, a minimum and maximum amount of mild reinforcement are needed to reach ductility levels similar to the reinforced concrete. The required amount of longitudinal rebar for target ductility was studied through the parametric study of post-tensioned members calibrated with the experiment outputs. Subsequently, ductility dependent behavior factor demands, Rdemand obtained from nonlinear time history analyses of two prototype buildings were related with curvature ductility and corresponding mild steel reinforcement amounts.

Subject Keywords

Post-tension, Reinforced Concrete, Beam, Seismic Design, Ductility

URI

https://hdl.handle.net/11511/110502

Collections

Graduate School of Natural and Applied Sciences, Thesis