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Proposition of Response Modification Factor of Low-rise Steel Intermediate Moment Frame in Korea using FEMA P695

FEMA P695를 이용한 국내 저층 철골 중간모멘트골조의 반응수정계수 제안

  • Han, A Rum (Frontier Architectural, Urban, and Environmental Engineering, Hanyang University) ;
  • Kim, Taewan (Architectural Engineering, Kangwon National University) ;
  • Yu, Eunjong (Frontier Architectural, Urban, and Environmental Engineering, Hanyang University)
  • 한아름 (한양대학교 첨단건축도시환경공학과) ;
  • 김태완 (강원대학교 건축공학과) ;
  • 유은종 (한양대학교 첨단건축도시환경공학과)
  • Received : 2013.10.21
  • Accepted : 2013.11.19
  • Published : 2014.01.02

Abstract

In current seismic design code, steel moment frames are classified into ordinary, intermediate, and special moment frames. In the case of special moment frames which have large R-factor, economic design is possible by reducing the design lateral force. However, there is difficulty for practical application due to constraints such as strong column-weak beam requirement. This study evaluated if steel intermediate moment frame could maintain enough seismic capacity when the R-factor is increased from 4.5 to 6. As for the analytical models, steel moment frames of 3 and 5 stories were categorized into four performance groups according to seismic design category. Seismic performances of the frames were evaluated through the procedure based on FEMA P695. FEMA P695 utilizes nonlinear static analysis(pushover analysis) and nonlinear dynamic analysis(incremental dynamic analysis, IDA). In order to reflect the characteristics of Korean steel moment frames on the analytical model, the beam-column connection was modeled as weak panel zone where the collapse of panel zone was indirectly considered by checking its ultimate rotational angle after an analysis is done. The analysis result showed that the performance criteria required by FEMA P695 was satisfied when R-factor increased in all the soil conditions except $S_E$.

Keywords

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