Simulação de fogo pós-sismo em estruturas metálicas: Aspetos de modelação no OpenSees

01/22/2021

Events such as earthquakes and fires can cause severe consequences, in terms of life and property losses. Cascading events like post-earthquake fires (PEF) increase the damage caused by the earthquake alone, mainly due to the fact that damaged structures are more vulnerable to the fire effects, than the undamaged ones. Thus, PEF is often responsible for additional damage to buildings. The current work is focused on investigating the influence of the damage induced by a seismic event on the fire resistance of a steel structure. A benchmark case is considered, and by performing several analyses assuming different fire scenarios, earthquakes and nonlinear frame element models, recommendation on the development of such analysis are provided. Results of different frame element models, which are developed in the OpenSees (Open System for Earthquake Engineering Simulation) platform, are compared in order to demonstrate the influence of different modeling choices in what concerns seismic behavior assessment. Existing models and analysis of steel frame structures in fire are explored, which are suitable to the case study example used herein. Criteria to evaluate structural resistance, based on EN1998-3, is proposed and tested in the scope of the case study. Finally, the PEF scenario is analyzed considering a couple of seismic events and two fire scenarios. Comparison is made between the response of damaged and undamaged structure.

Authors in the community:

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  R

  Rita De Almeida Palma

  ist425268

Supervisors of this institution:

• 

  R

  Rita Maria Do Pranto Nogueira Leite Pereira Bento

  ist12284

civil-engineering - Civil engineering

por - Portuguese

Instituto Superior Técnico