Dede, Sahin; Rossetto, Tiziana; Freddi, Fabio; (2023) Seismic performance of fire damaged structures: preliminary analysis of a 14-story case study structure. In: Proceedings of Conference Earthquake risk and engineering towards a resilient world (SECED 2023). Society for Earthquake and Civil Engineering Dynamics (SECED): Cambridge, UK.

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Abstract

Fires in residential buildings are one of the major and most frequent disasters affecting urban areas. Most fire-damaged buildings are repaired after the fire rather than demolished and replaced. In case of extreme fire events, the decision to repair the building usually involves extensive engineering investigation including materials testing and detailed damage assessment. However, these are often disregarded in case of small to medium size fires, where damage to structural elements may be less visible. In these cases, the repair process focuses on reinstating the aesthetic appearance of the building with limited consideration of how the strength of fireaffected structural elements may have been degraded. But what if the fire-affected building is sited in a seismic area? How will a fire-damaged building perform under seismic loading? The present paper presents an initial study that looks to help answer these questions. The paper evaluates the seismic performance of a typical high-rise reinforced concrete building in Istanbul (of tunnel-form construction), considering several fire damage scenarios. This region is considered for case study purposes due to its high seismic hazard and the high number of residential fires experienced every year (according to the data published by the Istanbul Fire Brigade). The case study structures are modelled in OpenSeesPY, with fire damage modelled considering deterioration in the material properties of the structural components under different scenarios of fire intensity and spread within the building. Nonlinear time history analyses are performed on the undamaged and fire-damaged structures to investigate the changes in the seismic response. The results highlight the increased seismic vulnerability of the fire-damaged structures and provide insights into which fire scenarios most affect the structure's seismic performance.

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