Dede, Sahin; Rossetto, Tiziana; Freddi, Fabio; (2024) Post-Fire Seismic Response of High-Rise Tunnel-Form Buildings. In: Proceedings of the 18th World Conference on Earthquake Engineering (18WCEE). International Association for Earthquake Engineering (IAEE)

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Abstract

Urban fires represent one of the major disasters frequently occurring in densely populated built environments. Except for rare cases of extreme residential fires leading to visible structural damage, reinstating the aesthetic appearance of the building without in-depth structural investigations is a widely followed practice for most fire-damaged buildings. Such a scenario does not generally jeopardise the daily service of the building thanks to the safety coefficients adopted in the gravity design. However, this may significantly affect the response and safety of buildings located in seismically active regions. The city of Istanbul is expecting a large earthquake in the near future and regularly suffers from thousands of residential fires annually, as revealed by the statistics of the Istanbul Fire Brigade. To investigate the effects of fire damage on the seismic response of building structures, the present paper numerically evaluates the seismic performance of an existing high-rise tunnel-form building, considering several fire damage scenarios of increasing intensity and progressive spread. Tunnel-form buildings are a popular typology used in mass housing projects in Turkey and are widespread across the country. A 14-storey tunnel-form building constructed in Istanbul is considered for case study purposes, and a state-of-the-art 3D finite element model of the case study building is developed in OpenSeesPY to carry out the numerical simulations. Numerical models are developed for the original undamaged structure and for several post-fire scenarios. Varying levels of deterioration caused by the intensity and spread of fire scenarios are reflected at material and section levels within the finite element models. Changes in the seismic response are investigated through nonlinear time history analyses performed on the undamaged and fire-damaged structures. The outcomes of this preliminary study present the increased seismic vulnerability in the post-fire state and highlight the impacts of the fire scenarios on different structural response parameters.

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