While the subduction zone earthquakes have long ground motion durations, the effects are also not covered in seismic design provisions. Additionally, the collapse risk of steel frame buildings subjected to long-duration ground motions from subduction earthquakes remains poorly understood. This paper presents the influence of ground motion duration on the collapse risk of steel frame buildings with special concentrically braced frames in chevron configurations. The steel buildings considered in this paper are designed at a site in Seattle, Washington, according to the requirements of modern seismic design provisions in the United States. For this purpose, the nonlinear dynamic analyses employ two sets of spectrally equivalent long and short-duration ground motions. Based on the use of high-fidelity structural models accounting for both geometric and material nonlinearities, the estimated collapse capacity for the modern code-compliant steel frame buildings is, on average, approximately 1.47 times the smaller value when considering long-duration ground motion record, compared to the short-duration counterpart. Due to the sensitivity to destabilizing P-Delta effects of gravity loads, the influence of ground motion duration on collapse risk is more profound for medium-to-high-rise steel frame buildings compared to the low-rise counterparts.

A B S T R A C T
1. 서 론
2. 해석대상 건물
    2.1 해석대상 건물 선정 및 설계하중
    2.2 구조부재 설계
    2.3 해석대상 건물 부지의 확률론적 지진재해도 해석
3. 비선형 구조해석모델 개발 및 동적해석
    3.1 구조해석 모델
    3.2 지반가속도 기록 및 비선형 구조해석
4. 붕괴위험도 평가
    4.1 조건부 붕괴위험도 평가
    4.2 연평균 붕괴빈도 평가
5. 결 론
감사의 글
REFERENCES

• 황성훈(국립금오공과대학교 건축학부 조교수) | Hwang Seong-Hoon (Assistant Professor, School of Architecture, Kumoh National Institute of Technology) Corresponding author
• 임유진(국립금오공과대학교 건축공학과 석사과정) | Yim Yu Jin (Master’s Course, Department of Architectural Engineering, Kumoh National Institute of Technology)