Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
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Earthquake Resistance of Modular Building Units Using Load-Bearing Steel Stud Panels

내력벽식 스터드패널을 적용한 모듈러건물유닛의 내진성능

  • Ha, Tae Hyu (Research Institute of Industrial Science & Technology) ;
  • Cho, Bong-Ho (Dept. of Architectural Engineering, Ajou University) ;
  • Kim, Tae Hyeong (Dept. of Architectural Engineering, Ajou University) ;
  • Lee, Doo Yong (Dept. of Architectural Engineering, Ajou University) ;
  • Eom, Tae Sung (Dept. of Architectural Engineering, Dankook University)
  • 하태휴 (포항산업과학연구원 건축구조본부) ;
  • 조봉호 (아주대학교, 건축공학과) ;
  • 김태형 (아주대학교, 건축공학과) ;
  • 이두용 (아주대학교, 건축공학과) ;
  • 엄태성 (단국대학교, 건축공학과)
  • Received : 2013.02.20
  • Accepted : 2013.08.06
  • Published : 2013.10.27
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Abstract

Cyclic tests on modular building units for low-rise buildings composed of stud panels and a light-weight steel perimeter frame, were performed to evaluate the earthquake resistance such as stiffness, load-carrying capacity, ductility, and energy dissipation per load cycle. The strap-braced and sheeted stud panels were used as the primary lateral load-resistant element of the modular building units. Test results showed that the modular building units using the strap-braced and sheeted stud panels exhibited excellent post-yield ductile behaviors. The maximum drift ratios were greater than 5.37% and the displacement ductility ratios were greater than 5.76. However, the energy dissipation per load cycle was poor due to severe pinching during cyclic loading. Nominal strength, stiffness, and yield displacement of the modular building units were predicted based on plastic mechanisms. The predictions reasonably and conservatively correlated with the test results. However, the elastic stiffness of the strap-braced stud panel was significantly overestimated. For conservative design, the elastic stiffness of the strap-braced stud panel needs be decreased to 50% of the nominal value.

본 연구에서는 스터드패널과 경량철골골조로 구성된 모듈러건물 유닛의 강성, 하중재하능력, 연성능력, 에너지소산능력 등 내진성능을 평가하기 위하여 주기실험을 수행하였다. 모듈러건물 유닛의 횡력저항요소로서 스트랩브레이스 및 시트강판으로 보강된 스터드패널을 사용하였다. 실험 결과, 스트랩브레이스 및 시트강판 보강 스터드패널을 사용한 모듈러건물유닛은 우수한 연성거동을 보였다. 최대변위비는 5.37% 이상을 보였고, 변위연성도는 5.76 이상인 것으로 나타났다. 그러나 주기거동 동안 핀칭이 크게 발생하여 주기당 에너지소산량은 좋지 않은 것으로 나타났다. 모듈러건물유닛의 소성메커니즘을 바탕으로 내진설계를 위한 강도, 항복변위, 탄성강성 등 설계식을 제안하였고 실험 결과와 비교를 통하여 제안된 설계식을 검증하였다. 제안된 방법은 모듈러건물유닛의 하중재하능력, 강성 등 내진성능을 합리적으로 예측하였다. 그러나 스트랩브레이스 보강 스터드패널의 탄성강성은 크게 과대평가되었으므로, 안전한 내진설계를 위해서는 구조해석 시 탄성강성을 50%로 줄이는 것이 필요하다.

Keywords

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