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Seismic strengthening and rehabilitation of RC frame structures with weak beam-column joints by installing wing walls

  • Yuebing Li
  • Yasushi SanadaEmail author
  • Koki Maekawa
  • Haruka Katayama
  • Ho Choi
  • Kazuto Matsukawa
  • Susumu Takahashi
Original Research
  • 52 Downloads

Abstract

A substantial number of reinforced concrete (RC) buildings with seismically substandard beam-column joints have suffered severe damage in past earthquakes. This paper focuses on the installation of RC wing walls to upgrade weak beam-column joints and to rehabilitate those moderately damaged by earthquakes. Cyclic load tests were conducted using four specimens representing an exterior 1.5-story frame with a beam-column joint. The first specimen was for a benchmark specimen, the second and third were strengthened by installing wing walls to the interior or exterior of the columns, and the fourth was rehabilitated after the existing frame was moderately damaged. Consequently, the benchmark specimen suffered severe damage to the beam-column joint. The two strengthened specimens showed different damage behaviour: the second one was ductile with beam yielding, and the third one prevented the column-sway mechanism. For the rehabilitated specimen, the beam yielded and the maximum strength was nearly equivalent to that of the second specimen in which wing walls were installed to the interior side of the columns, but damage to the joint was more severe. The test results indicated that the developed wing wall installation method is practical not only for strengthening poorly detailed beam-column joints but also for rehabilitating such joints moderately damaged by earthquakes.

Keywords

Developing country Post-earthquake rehabilitation Reinforced concrete Retrofitting Unreinforced joint 

Notes

Acknowledgements

This study was financially supported by the Kajima Foundation’s Research Grant and the Asahi Glass Foundation. The design drawings of the investigated building were provided by the Department of Public Works and Highways (DPWH) of the Philippines. The on-site investigation reported herein was assisted by Mr. Hayato Nakamura of the Japan International Cooperation Agency (JICA). The experimental investigations were conducted with members of the Nakano laboratory, Institute of Industrial Science, the University of Tokyo at the Chiba Experiment Station. The authors are very grateful for the above support.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.School of Civil Engineering and ArchitectureNortheast Electric Power UniversityJilinChina
  2. 2.Graduate School of EngineeringOsaka UniversityOsakaJapan
  3. 3.Department of ArchitectureShizuoka Institute of Science and TechnologyShizuokaJapan
  4. 4.Institute of Industrial ScienceThe University of TokyoTokyoJapan
  5. 5.Department of ArchitectureDaido UniversityNagoyaJapan

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