Proposal of new expressions for the calculation of section factor on structural steel columns in contact with walls

  • António Correia | antonio.correia@isec.pt Polytechnic Institute of Coimbra, ISEC, Coimbra, Portugal.
  • Paula Lopes Polytechnic Institute of Coimbra, ISEC, Coimbra, Portugal.
  • João Rodrigues Faculty of Sciences and Technology, University of Coimbra, Portugal.
  • José Correia Faculty of Sciences and Technology, University of Coimbra, Portugal.

Abstract

The fire resistance of a steel column is highly affected by the contact between the columns and the walls, leading in general to a favorable effect due to the reduction of temperatures. However, it leads to the Thermal Bowing effect, which is not more than a differential heating in the steel cross sections, causing an inversion of bending moments and an inversion of the deflections of the column. Thus, it is necessary to accurately assess the evolution of the temperature field in the cross section of the steel elements in contact with walls. In Eurocode 3 part 1-2, the structural design of steel elements in fire situation is performed with expressions for the calculation of the section factor of steel profiles, but different cases of positioning the columns and the surrounding walls could be considered as causing extremely high thermal gradients. In this paper, a new approach for the calculation of section factors for cases not included in table 4.2 of Eurocode 3, part 1- 2 are presented. This was achieved using numerical models with finite element modelling with the ABAQUS program, varying the cross-section of the columns, orientation of the web in relation to the walls, and the position and thickness of the walls, to achieve the desired section factors.

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Published
2019-10-11
Info
Issue
Section
Papers from the 5th CILASCI Congress: Reviews and Articles
Keywords:
Steel, Columns, Walls, Section Factor, Fire
Statistics
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  • PDF: 83
  • APPENDIX: 34
How to Cite
Correia, A., Lopes, P., Rodrigues, J., & Correia, J. (2019). Proposal of new expressions for the calculation of section factor on structural steel columns in contact with walls. Fire Research, 3(1). https://doi.org/10.4081/fire.2019.73