Title: | Torsional Behavior of Reinforced Concrete Beams Repaired or Strengthened with Transversal External Post – Tension Elements, Gamal Ismail Khalil, Ahmed Saeid Debaiky, Mohamed Hussien Makhlouf, and Ahmed EL-Sayed Ewis, IJSTE - International Journal of Science Technology & Engineering | Volume 4 | Issue 4 | October 2017, ISSN (online): 2349-784X |
Authors: | Gamal Ismail Khalil, Ahmed Saeid Debaiky, Mohamed Hussien Makhlouf, and Ahmed EL-Sayed Ewis |
Year: | 2017 |
Keywords: | Torsion, Post-Tension, Strengthening, Ductility, Web Opening |
Journal: | International Journal of Science Technology & Engineering (IJSTE) |
Volume: | Vol. 4 |
Issue: | 4 |
Pages: | 54-73 |
Publisher: | Not Available |
Local/International: | International |
Paper Link: | Not Available |
Full paper | Gamal Ismail Khaleel_02.pdf |
Supplementary materials | Not Available |
Abstract: |
This paper investigate the efficiency of using post-tension stainless steel links and steel links systems for strengthening and repairing R.C beams without and with web opening subjected to pure torsion. Post-tension force was produced in vertical links of high strength material using steel plate at top and bottom surface of the beams anchored with fine threads. Twenty Two specimens are divided into two parts, one part deal with solid beams and other deal with beams with web opening. The effect of post-tension force in vertical links, spacing between vertical links, post-tension technique (links – U shape), plates configuration and opening length are the effective variables on the torsion capacity were studied in this research. The experimental results shows that the post-tension system is very effective strengthening and repairing method to enhance torsion beam capacity up to 27.55 %. This system also increase the beams ductility, delay the appearance of first crack and reduce the crack width within increasing in applied torque till failure. Torsion capacity of beams with web opening strengthened with post-tension system significantly improves over the control beams and in some case reach the capacity of solid control beam. Failure of beams strengthened with post-tension system was due to spalling of concrete cover due to torsional moment. The failure of beams with web opening strengthening with post-tension system was in solid part not in opening corner as control beams with web opening. |