Mechanical properties of High and Very High Steel at elevated temperatures and after cooling down

High-strength steels (HSS) are produced using special chemical composition or/and manufacturing processes. Both aspects affect their mechanical properties at elevated temperatures and after cooling down, and particularly the residual strength and the ductility of the structural members. As HSS equates the design of lighter structural elements, higher temperatures are developed internally compared to the elements designed with conventional carbon steel. Therefore, the low thickness members, along with the severe effect of high temperature on the mechanical properties of the HSS, constitute to the increased vulnerability of such structures in fire. Moreover, the re-use and reinstatement of these structures are more challenging due to the lower residual mechanical properties of HSS after the cooling down period. This paper presents a review of the available experimental studies of the mechanical properties of HSS at elevated temperatures and after cooling down. The experimental results are collected and compared with the proposed material model (reduction factors) of EN1993–1-2. Based on these comparisons, modified equations describing the effect of elevated temperatures on the mechanical properties of HSS are proposed. Also, the post-fire mechanical properties of HSS are examined. A comprehensive discussion on the effect of influencing parameters, such as manufacturing process, microstructure, loading conditions, maximum temperature, and others is further explored.

[1]  Pentti Mäkeläinen,et al.  Mechanical properties of structural steel at elevated temperatures and after cooling down , 2004 .

[2]  Weiyong Wang,et al.  Experimental investigation of residual stresses in thin-walled welded H-sections after fire exposure , 2016 .

[3]  Jean-Marc Franssen,et al.  Experimental and numerical investigation of high-strength steel circular columns subjected to fire , 2013 .

[4]  Qiang Sun,et al.  Study on mechanical characteristics and safety evaluation method of steel frame structure after fire , 2014 .

[5]  M. Harmer,et al.  Expanding time–temperature-transformation (TTT) diagrams to interfaces: A new approach for grain boundary engineering , 2016 .

[6]  Venkatesh Kodur,et al.  Factors governing onset of local instabilities in fire exposed steel beams , 2016 .

[7]  R.J.M. Pijpers,et al.  Fatigue strength of welded connections made of Very High Strength Cast and Rolled Steels , 2011 .

[8]  X. Zhao,et al.  Mechanical properties of ultra-high strength (Grade 1200) steel tubes under cooling phase of a fire: An experimental investigation , 2015 .

[9]  Brian Uy,et al.  Performance of CFST column to steel beam joints subjected to simulated fire including the cooling phase , 2010 .

[10]  A. H. Korayem,et al.  Mechanical properties of very high strength steel at elevated temperatures , 2014 .

[11]  B. R. Kirby,et al.  The reinstatement of fire damaged steel framed structures , 1981 .

[12]  Aleksandar Sedmak,et al.  The influence of temperature on mechanical properties of the base material (BM) and welded joint (WJ) made of steel S690QL , 2016 .

[13]  C. Lee,et al.  Mechanical properties of heat-treated high strength steel under fire/post-fire conditions , 2014 .

[14]  Lin-Hai Han,et al.  Stress–strain model of austenitic stainless steel after exposure to elevated temperatures , 2014 .

[15]  Reidar Bjorhovde,et al.  Performance and Design Issues for High Strength Steel in Structures , 2010 .

[16]  H. Kolstein,et al.  Post-fire performance of very high strength steel S960 , 2013 .

[17]  Lisa Choe,et al.  Influence of Material Models on Predicting the Fire Behavior of Steel Columns , 2017, Fire technology.

[18]  Ben Young,et al.  Behavior of High Strength Structural Steel at Elevated Temperatures , 2006 .

[19]  M. Mahendran,et al.  Experimental investigation of post-fire mechanical properties of cold-formed steels , 2014 .

[20]  J. Y. Richard Liew,et al.  Mechanical properties of heat-treated high tensile structural steel at elevated temperatures , 2016 .

[21]  V. Kodur,et al.  Effect of Temperature on Strength and Elastic Modulus of High-Strength Steel , 2013 .

[22]  T. Gernay,et al.  Large-scale fire test of unprotected cellular beam acting in membrane action , 2010 .

[23]  RETRACTED CHAPTER: High Temperature Thermal Properties of Vanadium Steel , 2013 .

[24]  In-Rak Choi,et al.  Thermal and mechanical properties of high-strength structural steel HSA800 at elevated temperatures , 2014 .

[25]  Jiepeng Liu,et al.  Experimental study on post-fire mechanical properties of high strength Q460 steel , 2015 .

[26]  Yong Wang.  Postbuckling Behavior of Axially Restrained and Axially Loaded Steel Columns under Fire Conditions , 2004 .

[27]  Ben Young,et al.  Design of high strength steel columns at elevated temperatures , 2008 .

[28]  H. Kolstein,et al.  Post-fire mechanical properties of high strength structural steels S460 and S690 , 2012 .

[29]  Frans S.K. Bijlaard,et al.  Mechanical properties and design recommendations of very high strength steel S960 in fire , 2016 .

[30]  T. T. Lie,et al.  Structural fire protection , 1992 .

[31]  C. Zhang,et al.  Temperature-Dependent Material Modeling for Structural Steels: Formulation and Application , 2016 .

[32]  Frans S.K. Bijlaard,et al.  Dependence of mechanical properties of high strength steel S690 on elevated temperatures , 2012 .

[33]  William E. Luecke,et al.  High-temperature tensile constitutive data and models for structural steels in fire , 2015 .

[34]  Chrysanthos Maraveas,et al.  Post-fire assessment and reinstatement of steel structures , 2017 .

[35]  Mahen Mahendran,et al.  Numerical modelling of light gauge cold-formed steel compression members subjected to distortional buckling at elevated temperatures , 2010 .

[36]  Wei Guo,et al.  Microstructure and mechanical properties of laser welded S960 high strength steel , 2015 .

[37]  James B.P. Lim,et al.  Finite-element investigation of cold-formed steel portal frames in fire , 2016 .

[38]  Mahen Mahendran,et al.  Local Buckling Behaviour and Design of Cold-formed Steel Compression Members at Elevated Temperatures , 2004 .

[39]  Mahen Mahendran,et al.  Local buckling studies of cold-formed steel compression members at elevated temperatures , 2008 .

[40]  Frans S.K. Bijlaard,et al.  Elevated-temperature mechanical properties of high strength structural steel S460N: Experimental study and recommendations for fire-resistance design , 2013 .

[41]  Amin Heidarpour,et al.  Mechanical properties of partially damaged structural steel induced by high strain rate loading at elevated temperatures - An experimental investigation , 2015 .