Structural Engineering and Mechanics

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Effectiveness of seismic repairing stages with CFRPs on the seismic performance of damaged RC frames

  • Duran, Burak (Department of Civil Engineering, Dokuz Eylul University, Tinaztepe Campus) ;
  • Tunaboyu, Onur (Department of Civil Engineering, Anadolu University, 2 Eylul Campus) ;
  • Kaplan, Onur (Earth and Space Sciences Institute, Anadolu University, 2 Eylul Campus) ;
  • Avsar, Ozgur (Department of Civil Engineering, Anadolu University, 2 Eylul Campus)
  • Received : 2017.11.14
  • Accepted : 2018.05.13
  • Published : 2018.08.10
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Abstract

This study aims at evaluating the performance of repairing technique with CFRPs in recovering cyclic performance of damaged columns in flexure in terms of structural response parameters such as strength, dissipated energy, stiffness degradation. A 2/3 scaled substandard reinforced concrete frame was constructed to represent the substandard RC buildings especially in developing countries. These substandard buildings have several structural deficiencies such as strong beam-weak column phenomenon, improper reinforcement detailing and poor material properties. Flexural plastic hinges occurred at the columns ends after testing the substandard specimen under both constant axial load and reversed cyclic lateral loading. Afterwards, the damaged columns were externally wrapped with CFRP sheets both in transverse and longitudinal directions and then retested under the same loading protocol. In addition, ambient vibration measurements were taken from the undamaged, damaged and the repaired specimens at each structural repair steps to identify the effectiveness of each repairing step by monitoring the change in the natural frequencies of the tested specimen. The ambient vibration test results showed that the applied repairing technique with external CFRP wrapping was proved to recover stiffness of the pre-damaged specimen. Moreover, the lateral load capacity of the pre-damaged substandard RC frame was restored with externally bonded CFRP sheets.

Keywords

Acknowledgement

Supported by : Anadolu University

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