Multi-hazard life cycle cost analysis of steel buidlings with special moment resisting frames

In this study the performance-based design (PBD) methodology is used for the design and subsequently the life-cycle cost analysis of steel buildings with moment resisting frames subjected to wind and earthquake hazards. A case study on two 50-story buildings, designed to meet different performance levels, is presented. The first building is designed to meet the ASCE-7-10 limit for the annual probability of failure under wind loading conditions. The second building is designed for a higher annual probability of failure due to wind excitation. Incremental dynamic analysis (IDA) is performed for the structures for both seismic and wind hazards and results are presented in the form of collapse fragility curves. The performances of both structures, during very frequent wind events, is assessed in terms of occupant comfort. The potential economic losses due to both hazards are calculated and presented in terms of annual expected losses. Through this case study, it is observed that designing a structure with a higher annual probability of failure due to wind excitation could be a better investment strategy if the capital cost and expected life-cycle losses are taken into account.