Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Investigation of Seismic Performance of RC Wall-Slab Frames with Masonry Infill

조적채움벽을 갖는 RC 벽-슬래브 골조의 내진성능 연구

  • 김찬호 (단국대학교 건축학부) ;
  • 이승제 (단국대학교 건축학부) ;
  • 허석재 (단국대학교 내진리모델링연구소) ;
  • 엄태성 (단국대학교 건축학부)
  • Received : 2022.03.04
  • Accepted : 2022.04.06
  • Published : 2022.05.01
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Abstract

This study investigated the seismic performance of reinforced concrete (RC) wall-slab frames with masonry infills. Four RC wall-slab frames with or without masonry infill were tested under cyclic loading. The RC frames were composed of in-plane and out-of-plane walls and top and bottom slabs. For masonry infill walls, cement bricks were stacked applying mortar paste only at the bed joints, and, at the top, a gap of 50 mm was intentionally left between the masonry wall and top RC slab. Both sides of the masonry walls were finished by applying ordinary or fiber-reinforced mortars. The tests showed that despite the gap on top of the masonry walls, the strength and stiffness of the infilled frames were significantly increased and were different depending on the direction of loading and the finishing mortars. During repeated loading, the masonry walls underwent horizontal and diagonal cracking and corner crushing/spalling, showing a rocking mode inside the RC wall-slab frame. Interestingly, this rocking mode delayed loss of strength, and as a result, the ductility of the infilled frames increased to the same level as the bare frame. The interaction of masonry infill and adjacent RC walls, depending on the direction of loading, was further investigated based on test observations.

Keywords

Acknowledgement

이 연구는 한국연구재단의 대학중점연구소(NRF-2018R1A6A1A070258) 및 개인기본연구(NRF-2019R1F1A1059248) 지원사업의 연구비지원을 받아 수행되었습니다. 섬유보강 모르타르 미장에 도움을 주신 (주)에이엠에스엔지니어링에 감사드립니다.

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