Abstract
Purpose This purpose of this paper is to quantify the effect of local instability arising from high shear loading on response of steel girders subjected to fire conditions. Design/methodology/approach A three-dimensional nonlinear finite element model able to evaluate behavior of fire-exposed steel girders is developed. This model, is capable of predicting fire response of steel girders taking into consideration flexural, shear and deflection limit states. Findings Results obtained from numerical studies show that shear capacity can degrade at a higher pace than flexural capacity under certain loading scenarios, and hence, failure can result from shear effects prior to attaining failure in flexural mode. Originality/value The developed model is unique and provides valuable insight (and information) to the fire response of typical hot-rolled steel girder subjected to high shear loading.
Highlights
IntroductionStructural members, when exposed to fire, experience loss of capacity and stiffness due to temperature-induced degradation in strength and modulus properties of constituent materials
Structural members, when exposed to fire, experience loss of capacity and stiffness due to temperature-induced degradation in strength and modulus properties of constituent materials.When the capacity at the critical section of the member drops below the applied moment due to loading, failure occurs
This flexural limit state, valid for most common scenarios, may not be representative in certain situations where shear effects can be dominant in a fire-exposed member
Summary
Structural members, when exposed to fire, experience loss of capacity and stiffness due to temperature-induced degradation in strength and modulus properties of constituent materials. In contrast to ambient temperature design philosophy, where a beam is generally designed to satisfy flexural limits state, and checked for shear resistance, failure of beams under fire conditions is derived based on flexural limit state only This flexural limit state, valid for most common scenarios, may not be representative in certain situations where shear effects can be dominant in a fire-exposed member. A review of literature clearly shows that most previous studies focused on fire behavior of beams predominantly subjected to bending effects (Kodur and Dwaikat, 2010; Dwaikat and Kodur, 2011; Aziz and Kodur, 2013) These studies considered effects of various factors on flexural response of fire-exposed steel beams, such as restraint conditions and inelastic response. The model was validated against test data on beams and the model was applied to examine the influence of shear on fire response of steel girders under different loading configurations and web slenderness
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