NDLI: Perimeter Column Boundary Conditions in Structural Fire Modelling

Content Provider	Springer Nature Link
Author	Law, Angus
Copyright Year	2015
Abstract	This paper describes the impact of perimeter column boundary conditions in the modelling of multi-storey structures when subject to fire. An idealised model of a building section is created with a range of column boundary conditions; the sensitivity of results are then analysed. It is found that considering only a limited number of floors results in an overestimation of the moment in the perimeter column by up to 50% under standard heating, but has relatively little impact on beam displacements—less than 5% after standard heating. It is found that the proximity of the boundary conditions has less impact on the results as column stiffness reduces, or if moment connections are provided. A range of possible simplified boundary conditions are considered and it is concluded that the cruder restrained simplifications are likely to lead to an overestimation of column moment sometimes in excess of 50%, but have relatively little impact on floor deflection. Of the idealised boundary conditions analysed, it was found that representing 3 floors and 4 heights of column gives the most significant improvement in accuracy in comparison to a single storey model. Models with pinned boundary conditions ±1-floor (relative to the fire floor) and fixed boundary conditions at ±1.5 or ±2-floors (relative to the fire floor) gave a more accurate result than simply fixing at ±1-floor. It was found that when connections between the beam and the column are pinned, the model with boundary conditions pinned at ±1-floor and fixed at ±2-floors gives a more accurate result than the model with fixed conditions at ±1.5-floors. The results of the study are presented to allow modellers to make an informed judgement about the level of complexity with which to represent a structure above and below the fire-heated floor.
Starting Page	1845
Ending Page	1861
Page Count	17
File Format	PDF
ISSN	00152684
Journal	Fire Technology
Volume Number	52
Issue Number	6
e-ISSN	15728099
Language	English
Publisher	Springer US
Publisher Date	2015-09-05
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Structural fire modelling Boundary conditions Composite steel frame Finite element Perimeter columns Civil Engineering Classical Mechanics Characterization and Evaluation of Materials Physics
Content Type	Text
Resource Type	Article
Subject	Materials Science Safety, Risk, Reliability and Quality

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