Study on Mechanical Properties of High Strength Steel S460 at Elevated Temperatures and Fire-resistance Design Recommendations

QIANG Xuhond, WU Kaidong, Jiang Xu, Luo Yongfeng


This paper investigates the parameter evaluation of mechanical behavior of high strength structural steels in fire-resistance design. In order to reveal the elevated-temperature mechanical properties of high strength steel S460N, tensile tests were conducted under both fire conditions of steady state and transient state. The elevated-temperature reduction factors of elastic modulus, yield and ultimate strengths of S460N were obtained and compared to those in the current design standards and available literature. According to the comparison between the research results on S460N, the available research results in literature on S460N, S460M, Q460 and various mild steels, it is found that the deterioration of mechanical properties of structural steels at elevated temperatures is dependent on steel grades and manufacturing method. Therefore, the recommendations in current design standards are not applicable to high strength structural steels. Moreover, unique predictive equations for the deterioration of S460 mechanical properties at elevated temperatures were proposed and validated against the available literatures.


Keywords: high strength structural steel,  elevated temperature,  mechanical properties,  experiment study,  fire-resistance design

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CEN. Eurocode 3 Design of steel structures-pail 1 -2:general rules -structural fire design [S].Brussels:CEN .2005.

YAO C R. LI Y D.QIANG S Z.Developroent and application of high performance steel for bridges in united states [J]. Wond Bridges, 2005(1):57-60. ( In Chinese)

COLLIN P.JOHANSSON B.Bridges in high strength steel[C]//I-ABSE Symposium. BudapestdABSE. 2006:1-9.

KODUR V.DWAIKAT M.FIKE B.lligh-temperatnre pmpeilies of steel for fire resistance modeling of structures [J].Journal of Materials in Civil Engineering,2010,22(5):423-434.

OITINEN J.KESTI J.MAKELAINEN P.Fire design model for stmctural steel S355 based upon transient slate tensile test results [J].Journal of Constructional Steel Research, 1997.42 (3): 161- 169.

MAKELAINEN P.OUTINEN J.KESTI J.Fire design model for stmctural steel S420M based upon transient-state tensile test results [J]. Journal of Constructional Steel Besearch. 1998.48(1): 47-57.

OliTINENJ. Mechanical properties of stmctural steels at high temperatures and after cooling down[R].Helsinki,Finland;Helsinki University of Technology Laboratory of Steel Structures,2007:1-10

OUTINEN [J]. MAKELAINEN P. Mechanical properties of structural steel at elevated temperatures and after cooling down [J]. Fire and Materials, 2004.28( 2/4 ):237-251.

OUTINEN J. KAIT1LA O. MAKELAINEN P. High -temperature testing of structural steel and modelling of structures at fire temperatures [R]. Helsinki,Finland:Helsinki University of Technology Laboratory of Steel Structures, 2001:1-10.

LANGE J. WOHLFEIL N. Examination of the mechanical properties of the microalloyed grain refined steel S460 at elevated temperatures [J]. Bautechnik. 2007.84( 10):711-720.

SCHNEIDEH R. LANGE J. Constitutive equations of structural steel S460 at high temperatures [G]//Nordic Steel Construction Conference. Sweden: Nordicsteel. 2009:204-211.

SCHNEIDER R. LANGE J. Constitutive equations and empirical creep law of structural steel S460 at high temperatures[j] Journal of Structural Fire Engineering, 2011.2(3 ):217-230.


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