Experimental Investigation on Mechanical Properties of Fire-Resistant Steel Q235FRB at Elevated Temperature
To investigate the mechanical properties of fire-resistant steel under elevated-temperature conditions,a steady-state method was used to conduct tensile experiments on standard specimens of fire-resistant steel Q235FRB.Based on the experimental results,stress-strain curves of fire-resistant steel Q235FRB under different temperature conditions were obtained,from which reduction factors for various mechanical performance parameters of fire-resistant steel(including elastic modulus,yield strength,and tensile strength)at elevated temperatures were obtained.The research results indicate that the strength parameters of fire-resistant steel Q235FRB(including elastic modulus,yield strength,and tensile strength)exhibit a negative correlation with temperature,and corresponding calculation models are proposed.When the temperature reaches 400℃,the degradation rate of strength parameters accelerates,with strength parameters reaching approximately 10%of room-temperature performance when the temperature rises to 800℃.The deformation parameter(ultimate elongation)of fire-resistant steel Q235FRB decreases first and then increases with the increase of temperature.Through comparative analysis,it is demonstrated that the mechanical and high-temperature resistance properties of fire-resistant steel Q235FRB surpass those of equivalent-grade ordinary steel,show casing promising application prospects.
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