Earthquakes and Structures

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Experimental study on replaceable precast concrete beam-column connections

  • Seung-Ho Choi (Department of Disaster Management and Fire Safety Engineering, University of Seoul) ;
  • Sang-Hoon Lee (Department of Architectural Engineering and the Smart City Interdisciplinary Major Program, University of Seoul) ;
  • Jae-Hyun Kim (Department of Architectural Engineering, University of Seoul) ;
  • Inwook Heo (Department of Architectural Engineering, University of Seoul) ;
  • Hoseong Jeong (Department of Architectural Engineering, University of Seoul) ;
  • Kang Su Kim (Department of Architectural Engineering and the Smart City Interdisciplinary Major Program, University of Seoul)
  • Received : 2023.03.15
  • Accepted : 2023.12.19
  • Published : 2024.01.25
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Abstract

The purpose of this study was to develop a system capable of restoring the seismic performance of a precast concrete (PC) connection damaged by an earthquake. The developed PC connection consists of a top-and-seat angle, post-tensioning (PT) tendons, and U-shaped steel. The PC beam can be replaced by cutting the PT tendons in the event of damage. In addition, the seismic performance of the developed PC beam-column connection was evaluated experimentally. A PC beam-column connection specimen was fabricated, and a quasistatic cyclic loading test was conducted to a maximum drift ratio of 2.3%. Subsequently, the PC beam was replaced by a new PC beam, and the repaired PC connection was loaded to a maximum drift ratio of 5.1%. The structural performance of the repaired PC connection was then compared with that of the original PC connection. The difference in the load at the drift ratio of 2.3% between the original and the repaired PC specimens was only 0.2%. The residual drift ratio in the repaired PC specimen did not exceed 1.0% at the 2.0 % drift ratio cycles, which satisfies the life safety performance level specified in ACI 374.2R-13. When the developed PC connection system is used, structural performance can be restored by rapidly replacing the damaged elements.

Keywords

Acknowledgement

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2021R1I1A1A01040337).

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