Structural retrofitting of simply supported reinforced concrete beams using turnbuckle exterior post tensioning

Authors

• Bernardo A. Lejano, De La Salle University, Manila
• Dustin Grimares, De La Salle University, Manila
• Mikael Peñamante, De La Salle University, Manila
• Janina Roxas, De La Salle University, Manila
• Kenneth Roi P. Toral, De La Salle University, Manila

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Document Type

Article

Source Title

DLSU Research Congress 2015

Publication Date

3-2015

Abstract

Due to long term environmental exposure and excessive loading experienced by aging structures, the structural performance of reinforced concrete members are affected; whereas RC beams deflect over time and eventually compromises the flexural performance and serviceability of the structure. Instead of demolishing structures considered to have poor performance, a turnbuckle type of exterior post tensioning system would be used as a retrofitting method in order to resolve the structural, environmental and cost problems. The turnbuckle exterior post tensioning (T-EPT) makes use of a turnbuckle mechanism to provide pre-stressing force to a flexural member. An experimental method was designed in order to determine the effectiveness of the T-EPT in terms of retrofitting RC beams back into its original condition and further increase its load carrying capacity. The experimental results proved that the effectiveness of applying the T – EPT depends on the elastic condition of the RC beams. The T- EPT was effective in retrofitting RC beams deflected until the elastic range; however, for beams deflected up to the inelastic range, the turnbuckle mechanism only provided 15% decrease in permanent deformation. Even if the inelastic RC beams were not brought back to its original condition (zero deflection), the experiment have presented further improvements. The pre – stressing force applied by the T – EPT increased load carrying capacity of the RC beams up to 40% for the elastic range, and up to 27% for the inelastic range. Based on the experiment made, recommendations were obtained to further improve some procedures in testing the T- EPT.

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Recommended Citation

Lejano, B. A., Grimares, D., Peñamante, M., Roxas, J., & Toral, K. P. (2015). Structural retrofitting of simply supported reinforced concrete beams using turnbuckle exterior post tensioning. DLSU Research Congress 2015 Retrieved from https://animorepository.dlsu.edu.ph/faculty_research/15120

Disciplines

Structural Engineering

Keywords

Buildings—Retrofitting; Reinforced concrete; Post-tensioned prestressed concrete

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