Seismic performance of post-tensioned cast-in-place reinforced concrete beams

Date

2025-1-10

Author

Tuncer, Ertürk

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Post-tensioning is an efficient solution for reinforced concrete beams in long-span moment-resisting frame systems. This study experimentally investigates the seismic performance of post-tensioned reinforced concrete beams. For this purpose, exterior and interior post-tensioned beam-to-column joints were chosen from a code-compliant prototype frame building and 1:2 scaled specimens were constructed. The primary test variables were mild steel ratio, load-balancing ratio, and specimen location. The laboratory results were examined through comparisons of base shear-lateral displacement, moment-curvature, crack width, energy dissipation, equivalent viscous damping ratio, and stiffness degradation. A simple section analysis approach was taken to specify the minimum mild steel ratio of bonded post-tensioned reinforced concrete beams for ductile response. In addition to those, non-linear finite element analyses were conducted to simulate the behavior of the test specimens and compare with the experimental findings. After validating the model, stress profiles for reinforcing steel and tendon were studied. Lastly, the maximum crack width, tendon stress, confined concrete strain, and ultimate curvature computed using numerical model were compared with experimental results and design codes.

Subject Keywords

Post-tension, Reinforced concrete beam, Seismic design, Mild steel

URI

https://hdl.handle.net/11511/113422

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Graduate School of Natural and Applied Sciences, Thesis