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Reliability Analysis of a 9-story Steel Building under Post Earthquake Fires

Speaker: Negar Elhami Khorasani, Graduate Student
Series: MMS Brown Bag Seminars
Location: Engineering Quad E219
Date/Time: Tuesday, October 1, 2013, 12:30 p.m. - 1:30 p.m.

Abstract:

Post earthquake fires are major hazards with possible intense consequences. Civil engineering design is moving towards the concept of resilient cities, which requires buildings with structural systems to perform adequately after extreme hazards and ensure human safety. One way to achieve such objectives is to use probabilistic system-level analysis of structures to quantify and optimize risk of failure due to an extreme event. The uncertainties in occurrence of the event as well as behavior of the structure under the hazard should be considered. This research studies probabilistic performance of a 9-story steel building with moment resisting frames on the perimeter under post earthquake fires. As part of the reliability analysis, the building is analyzed under multiple earthquake scenarios and fire locations with variable fire load density. The 9-story frame is modeled in the open source software OpenSees. System-level analysis is performed and interaction of members with each other, under both seismic and fire events, is considered together in one program. The building experiences permanent plastic deformation after the earthquake, and then the fire event starts in one of the compartments of the structure, with the initial condition of a damaged structure that is leaning due to plastic deformation. The probability of failure is calculated for the different considered scenarios.