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Closed-Form Procedure for Predicting the Capacity and Demand of Steel Beam-Columns under Fire

2011; American Society of Civil Engineers; Volume: 137; Issue: 9 Linguagem: Inglês

10.1061/(asce)st.1943-541x.0000443

1943-541X

Spencer E. Quiel, Maria Garlock, Ignacio Payá-Zaforteza,

Structural Behavior of Reinforced Concrete

During a fire, columns on the perimeter of a building will be subject to moments induced by both a thermal gradient and the restraint of axial expansion by adjacent heated beams, which themselves develop axial load. These members thus act as beam-columns because they are then subject to a combination of axial load plus moment caused by a combination of gravity plus thermal loading. This paper presents a two-pronged procedure to predict the behavior of the perimeter column as a beam-column, considering both the individual member response (including thermal gradients) and the global response (including the interactions of adjacent members). All methods discussed in the paper are closed-form (i.e., they require no iteration) and can therefore be solved by using a spreadsheet or simple mathematical algorithm. The framework is sufficiently simple for use in codified structural-fire design and could be included in a reference of performance-based analysis methods for steel structures. Although this paper specifically addresses the performance of columns on the perimeter of buildings, the proposed framework can be a blueprint for the performance-based analysis of other beam-columns, such as floor beams.