Seismic reliability comparison of steel frames with various lateral load carrying systems

Gholami Moushangaie, Mehrdad (2018) Seismic reliability comparison of steel frames with various lateral load carrying systems. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

Research Aim: Investigating the Seismic Vulnerability of highly Used Steel Structures in Iran, regular and irregular Steel moment frames and concentrically braced frames Systems, with Irregularities in the Earthquake events, and Comparing them to Select an Optimal Structural System for a building. Research method: The present study investigates the seismic reliability of the two common structural systems in steel buildings, namely the steel concentrically braced frames and steel moment resisting frames, using the fragility curve method, also this study investigates the impact of vertical irregularity of the structure with soft story on this comparison. More precisely, first Two groups of regular structures, namely, three and six stories frames, with a steel moment resisting frame system and concentrically steel braced frames will be designed then the same exact structures this time with vertical irregularity, namely, a soft story will be designed. These structures are then evaluated using incremental dynamic analysis, which is a collection of non-linear time-history analyzes that are scaled, and finally, the fragility curve of each of these structures for three levels of performance (Immediate occupancy, life safety, and collapse prevention) are extracted and compared with each other. Findings: When the soft floor is placed on the first floor, it can be seen that in this states the braced frames are in the most critical state in comparison to moment resisting frames. Conclusion: The sensitivity of the concentrically braced frames is also centered on the placement of the soft floor in the first floor, and when the soft floor falls on the first floor, the structure's performance in the earthquake is weaker and the probability of deterioration and especially overturning is higher in them.

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