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Cold-formed steel columns subject to local buckling at elevated temperatures

By Shanmuganathan Gunalan and Mahen Mahendran

Abstract

Fire safety design of building structures has received greater attention in recent times due to continuing losses of properties and lives in fires. However, the structural behaviour of thin-walled cold-formed steel columns under fire conditions is not well understood despite the increasing use of light gauge steels in building construction. Cold-formed steel columns are often subject to local buckling effects. Therefore a series of laboratory tests of lipped and unlipped channel columns made of varying steel thicknesses and grades was undertaken at uniform elevated temperatures up to 700°C under steady state conditions. Finite element models of the tested columns were also developed, and their elastic buckling and nonlinear analysis results were compared with test results at elevated temperatures. Effects of the degradation of mechanical properties of steel with temperature were included in the finite element analyses. The use of accurately measured yield stress, elasticity modulus and stress-strain curves at elevated temperatures provided a good comparison of the ultimate loads and load-deflection curves from tests and finite element analyses. The commonly used effective width design rules and the direct strength method at ambient temperature were then used to predict the ultimate loads at elevated temperatures by using the reduced mechanical properties. By comparing these predicted ultimate loads with those from tests and finite element analyses, the accuracy of using this design approach was evaluated

Topics: 090506 Structural Engineering, Cold-formed steel, Column, Local buckling, Elevated Temperatures, Experimental study, Finite element modelling
Year: 2013
OAI identifier: oai:eprints.qut.edu.au:60666

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Citations

  1. (2009). Behaviour and design of cold-formed steel compression members at elevated temperatures,
  2. (2000). Cold-formed Steel Design,
  3. (1998). Computational modelling of cold-formed steel: Characterising geometric imperfections and residual stresses,
  4. (2006). Design of cold-formed steel lipped channel columns at elevated temperatures,
  5. (2006). Distortional buckling behaviour of cold-formed steel compression members at elevated temperatures,
  6. (2002). Effect of imperfections on numerical simulation of instability behaviour of cold-formed steel members,
  7. European Committee for Standardization (ECS), EN 1993-1-2, 2005, Eurocode 3: Design of steel structures. Part 1.2: General Rules - Structural Fire Design,
  8. European Committee for Standardization (ECS), EN 1993-1-3, 2006, Eurocode 3: Design of Steel Structures. Part 1.3: General Rules - Supplementary Rules for Cold-formed Members and Sheeting,
  9. (2009). Experimental study of the mechanical properties of light gauge cold-formed steels at elevated temperatures,
  10. (2006). GBT-based structural analysis of thin-walled members: overview, recent progress and future developments, advances in engineering structures, Mechanics and Construction,
  11. (2002). Local, distorsional and euler buckling of thin-walled columns,
  12. (2011). Mechanical properties of cold-formed steels at elevated temperatures,
  13. (2006). Progress on the direct strength method,
  14. (2007). Specifications for the Cold-formed Steel Structural Members, Cold-formed Steel Design Manual,
  15. (2010). Structural behaviour and design of cold-formed steel beams at elevated temperatures,
  16. (2003). Structural behaviour of thin-walled short steel channel columns at elevated temperatures. Part 2: Design calculations and numerical analyses,
  17. (1995). The local buckling of RHS members at elevated temperatures,
  18. (2001). Thin-walled column design considering local, distorsional and euler buckling,

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