Techno Press
Techno Press

Steel and Composite Structures   Volume 9, Number 2, April 2009, pages 89-101
DOI: http://dx.doi.org/10.12989/scs.2009.9.2.089
 
Post-buckling behaviours of axially restrained steel columns in fire
Guo-Qiang Li, Peijun Wang and Hetao Hou

 
Abstract     [Full Text]
    This paper presents a simplified model to study post-buckling behaviours of the axially restrained steel column at elevated temperatures in fire. The contribution of axial deformation to the curvature of column section is included in theoretical equations. The possible unloading at the convex side of the column when buckling occurs is considered in the stress-strain relationship of steel at elevated temperatures. Parameters that affect structural behaviours of the axial restrained column in fire are studied. The axial restraint cause an increase in the axial force before the column buckles; the buckling temperature of restrained columns will be lower than non-restrained steel columns. However, the axial force of a restrained column decreases after the column buckles with the elevation of temperatures, so make use of the post-buckling behaviour can increase the critical temperature of restrained columns. Columns with temperature gradient across the section will produce lower axial force at elevated temperatures.
 
Key Words
    Axial Restraint; Fire; Post-buckling; Critical temperature; Steel Column.
 
Address
Guo-Qiang Li; College of Civil Engineering, Tongji University, Shanghai, 200092, China, State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai, 200092, China
Peijun Wang; College of Civil Engineering, Tongji University, Shanghai, 200092, China, Building Department of Shandong University, Jinan, 250000, China
Hetao Hou; Building Department of Shandong University, Jinan, 250000, China
 

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