In the United States, seismic design standards are crucial in classifying buildings into Risk Categories I to IV. These categories are based on the buildings' occupancy type and the potential risk they pose to public safety, the protection of human life, and the socioeconomic consequences of structural collapse in the event of an earthquake. As the risk category increases, a higher seismic importance factor and more stringent drift limits are imposed on the respective building. This results in enhanced lateral strength and stiffness of the seismic force-resisting system. This study, which compares the seismic demands of special moment frame buildings assigned to high-risk categories, focusing on static system overstrength, ductility, and collapse risk, provides practical insights for structural engineers and architects. For this purpose, nonlinear static and dynamic analyses are performed to quantify the seismic demands of 18 steel frame buildings assigned to Risk Categories II, III, and IV. The findings indicate that buildings in Risk Category II do not meet the target collapse risk of 1% in 50 years, as specified in ASCE/SEI 7. For buildings in higher risk categories, the equivalent lateral force method for estimating seismic base shear is deemed more effective in ensuring adequate seismic performance.

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1. 서 론
2. 대상건물
3. 비선형 구조해석모델
4. 비선형 구조해석
    4.1 비선형 정적해석
    4.2 비선형 동적해석
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