Earthquakes and Structures

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Experimental investigation of a frame retrofitted with carbon textile reinforced mortar

  • Sinan M., Cansunar (Faculty of Civil Engineering, Istanbul Technical University) ;
  • Kadir, Guler (Faculty of Civil Engineering, Istanbul Technical University)
  • Received : 2022.05.31
  • Accepted : 2022.11.16
  • Published : 2022.11.25
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Abstract

The research investigates experimentally the effect of confinement on structural behavior at the ends of beam-column in reinforced concrete (RC) frames. In the experimental study, five specimens consisting of 1/3-scaled RC frames having single-bay, representing the traditional deficiencies of existing buildings constructed without receiving proper engineering service is investigated. The RC frame specimens were produced to represent most of the existing buildings in Turkey that have damage potential. To decrease the probable damage to the existing buildings exposed to earthquakes, the carbon Textile Reinforced Mortar (TRM) strengthening technique (fully wrapping) was used on the ends of the RC frame elements to increase the energy dissipation and deformation capacity. The specimens were tested under reversed cyclic lateral loading with constant axial loads. They were constructed satisfying the weak column-strong beam condition and consisting of low-strength concrete, such as compressive strength of 15 MPa. The test results were compared and evaluated considering stiffness, strength, energy dissipation capacity, structural damping, ductility, and damage propagation in detail. Comprehensive investigations of these experimental results reveal that the strengthening of a brittle frame with fully-TRM wrapping with non-anchored was effective in increasing the stiffness, ductility, and energy dissipation capacities of RC bare frames. It was also observed that the frame-only-retrofitting with an infill wall is not enough to increase the ductility capacity. In this case, both the frame and infill wall must be retrofitted with TRM composite to increase the stiffness, lateral load carrying, ductility and energy dissipation capacities of RC frames. The presented strengthening method can be an alternative strengthening technique to enhance the seismic performance of existing or moderately damaged RC buildings.

Keywords

Acknowledgement

The experimental research was carried out at the Structural and Earthquake Engineering Laboratory of Istanbul Technical University. The authors thank the technical staff of the laboratory for their helpful assistance, and also the Scientific Research Project Unit of Istanbul Technical University (BAP) for providing the financial support (Protocol #3555) for the Ph.D. study.

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