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Fire-after-earthquake resistance of steel structures using rotational capacity limits
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  • Journal title : Earthquakes and Structures
  • Volume 10, Issue 4,  2016, pp.867-891
  • Publisher : Techno-Press
  • DOI : 10.12989/eas.2016.10.4.867
 Title & Authors
Fire-after-earthquake resistance of steel structures using rotational capacity limits
Pantousa, Daphne; Mistakidis, Euripidis;
This paper addresses numerically the behavior of steel structures under Fire-after-Earthquake (FAE) loading. The study is focused on a four-storey library building and takes into account the damage that is induced in structural members due to earthquake. The basic objective is the assessment of both the fire-behavior and the fire-resistance of the structure in the case where the structure is damaged due to earthquake. The combined FAE scenarios involve two different stages: during the first stage, the structure is subjected to the ground motion record, while in the second stage the fire occurs. Different time-acceleration records are examined, each scaled to multiple levels of the Peak Ground Acceleration (PGA) in order to represent more severe earthquakes with lower probability of occurrence. In order to study in a systematic manner the behavior of the structure for the various FAE scenarios, a two-dimensional beam finite element model is developed, using the non-linear finite element analysis code MSC-MARC. The fire resistance of the structure is determined using rotational limits based on the ductility of structural members that are subjected to fire. These limits are temperature dependent and take into account the level of the structural damage at the end of the earthquake and the effect of geometric initial imperfections of structural members.
Fire-After-Earthquake loading;frame structures;rotational capacity;fire-resistance;
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