Earthquakes and Structures

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Out-of-plane performance of infill masonry walls reinforced with post-compressed wedges under lateral-concentrated push load

  • Sanghee Kim (Department of Architectural Engineering, Kyonggi University) ;
  • Ju-Hyun Mun (Department of Architectural Engineering, Kyonggi University) ;
  • Jun-Ryeol Park (Department of Architectural Engineering, Kyonggi University) ;
  • Keun-Hyeok Yang (Department of Architectural Engineering, Kyonggi University) ;
  • Jae-Il Sim (Korea Disaster Prevention Safety Technology Co. Ltd)
  • Received : 2024.03.21
  • Accepted : 2024.04.12
  • Published : 2024.06.25
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Abstract

Infill masonry walls are vulnerable to lateral loads, including seismic, wind, and concentrated push loads. Various strengthening metal fittings have been proposed to improve lateral load resistance, particularly against seismic loads. This study introduces the use of post-compressed wedges as a novel reinforcement method for infill masonry walls to enhance lateral load resistance. The resistance of the infill masonry wall against lateral-concentrated push loads was assessed using an out-of-plane push-over test on specimens sized 2,300×2,410×190 mm3. The presence or absence of wedges and wedge spacing were set as variables. The push-over test results showed that both the unreinforced specimen and the specimen reinforced with 300 mm spaced wedges toppled, while the specimen reinforced with 100 mm spaced wedges remained upright. Peak loads were measured to be 0.74, 29.77, and 5.88 kN for unreinforced specimens and specimens reinforced with 100 mm and 300 mm spaced wedges, respectively. Notably, a tighter reinforcement spacing yielded a similar strength, as expected, which was attributed to the increased friction force between the masonry wall and steel frame. The W-series specimens exhibited a trend comparable to that of the displacement ductility ratio. Overall, the findings validate that post-compressed wedges improve the out-of-plane strength of infill masonry walls.

Keywords

Acknowledgement

This work was supported by National Research Foundation of Korea (NRF) Grant (NRF-2021R1I1A2048618 and NRF-2022R1A4A5028239).

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