INVESTIGATION OF THE BEHAVIOR AND PROGRESSIVE COLLAPSE OF MID-RISE STEEL MOMENT-RESISTING FRAMES EXPOSED TO FIRE

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Chaboki M.; AGHAKOUCHAK A.A.

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Journal Paper

Paper Information

Journal: Sharif Journal of Civil Engineering Year:2020 | Volume:36-2 | Issue:2/2 Page(s): 139-149

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Title

INVESTIGATION OF THE BEHAVIOR AND PROGRESSIVE COLLAPSE OF MID-RISE STEEL MOMENT-RESISTING FRAMES EXPOSED TO FIRE

Author(s)

Chaboki M. | AGHAKOUCHAK A.A. | Issue Writer Certificate

Keywords

Steel moment resisting frame system

opensees software

nonlinear thermal analysis

Fire scenarios

progressive collapse

Abstract

This paper investigates the behavior of mid-rise steel moment-resisting frames (MRF) subjected to compartment re and progressive collapse scenarios due to oor drop and column removal. In this study, initially, a typical 15-story building with a moment-resisting frame system and a story height of 3. 2 (m) was designed using relevant chapters of national building code of Iran for conventional gravity and lateral loads. In order to perform thermal analyses, the most critical frame of this structure is modelled using opensees software. Then the nonlinear behavior of the frame is studied at elevated temperatures under di erent scenarios. In these analyses, the structure is subjected to both gravity and thermal loading simultaneously. Moreover, for performing thermal analysis, a standard re curve (ISO834) is used. Results of this study indicate that beams do not deform signi cantly until approximately 400 C; however, after that, vertical displacements of beams increase signi cantly due to degrading mechanical properties of steel. Moreover; beams deform and collapse at about 500 C to 650 C. In addition, the beam heating initially causes axial forces in the beams due to thermal expansion restraint. Furthermore, Demand to Capacity Ratios of beams increase from early stages of re and the most increase of DCRnom occurs at about 350 C to 400 C. Demand to Capacity Ratios of columns increase from early stages of re, causing the columns to reach their linear limit state in early stages. This behavior results from the thermal expansion of heated oor, which induce large horizontal displacement and, consequently, cause additional bending moment in the outer column. Moreover, by one story oor drop, columns survive up to 500 C. However, at higher temperatures (about 600 C to 750 C), these heated columns lose their strength and buckle. In column removal scenarios, in the rst and 7th stories, where beams lose their strength at about 200 C and 400 C, respectively, more damage is observed compared to oor drop scenarios. Fire in lower stories of structures is more critical than that in upper stories since they carry more gravity loads and start to behave nonlinearly at lower temperatures. Moreover, re in the middle spans produces a more critical situation than that in the end spans, and interior columns are more critical than corner columns.

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APA: Copy

Chaboki, M., & AGHAKOUCHAK, A.A.. (2020). INVESTIGATION OF THE BEHAVIOR AND PROGRESSIVE COLLAPSE OF MID-RISE STEEL MOMENT-RESISTING FRAMES EXPOSED TO FIRE. SHARIF: CIVIL ENINEERING, 36-2(2/2 ), 139-149. SID. https://sid.ir/paper/957245/en

Vancouver: Copy

Chaboki M., AGHAKOUCHAK A.A.. INVESTIGATION OF THE BEHAVIOR AND PROGRESSIVE COLLAPSE OF MID-RISE STEEL MOMENT-RESISTING FRAMES EXPOSED TO FIRE. SHARIF: CIVIL ENINEERING[Internet]. 2020;36-2(2/2 ):139-149. Available from: https://sid.ir/paper/957245/en

IEEE: Copy

M. Chaboki, and A.A. AGHAKOUCHAK, “INVESTIGATION OF THE BEHAVIOR AND PROGRESSIVE COLLAPSE OF MID-RISE STEEL MOMENT-RESISTING FRAMES EXPOSED TO FIRE,” SHARIF: CIVIL ENINEERING, vol. 36-2, no. 2/2 , pp. 139–149, 2020, [Online]. Available: https://sid.ir/paper/957245/en

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