Experimental Investigation on Mechanical Properties of Fire-Resistant Steel Q235FRB at Elevated Temperature

Zeyu Zhang; Lijing Zeng; Hongxu Li; Luzhen Jiang; Yuedong Wang; Zhaoxin Hou; Weinan Li

doi:10.13206/j.gjgS24051601

Volume 39 Issue 10

Oct. 2024

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Zeyu Zhang, Lijing Zeng, Hongxu Li, Luzhen Jiang, Yuedong Wang, Zhaoxin Hou, Weinan Li. Experimental Investigation on Mechanical Properties of Fire-Resistant Steel Q235FRB at Elevated Temperature[J]. STEEL CONSTRUCTION(Chinese & English), 2024, 39(10): 111-118. doi: 10.13206/j.gjgS24051601

Citation:

Zeyu Zhang, Lijing Zeng, Hongxu Li, Luzhen Jiang, Yuedong Wang, Zhaoxin Hou, Weinan Li. Experimental Investigation on Mechanical Properties of Fire-Resistant Steel Q235FRB at Elevated Temperature[J]. STEEL CONSTRUCTION(Chinese & English), 2024, 39(10): 111-118. doi: 10.13206/j.gjgS24051601

Citation:

Zeyu Zhang, Lijing Zeng, Hongxu Li, Luzhen Jiang, Yuedong Wang, Zhaoxin Hou, Weinan Li. Experimental Investigation on Mechanical Properties of Fire-Resistant Steel Q235FRB at Elevated Temperature[J]. STEEL CONSTRUCTION(Chinese & English), 2024, 39(10): 111-118. doi: 10.13206/j.gjgS24051601

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Experimental Investigation on Mechanical Properties of Fire-Resistant Steel Q235FRB at Elevated Temperature

doi: 10.13206/j.gjgS24051601

1. Central Research Institute of Building and Construction Co., Ltd., MCC Group, Beijing 100088, China;
2. School of Civil Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China;
3. National Steel Structure Engineering Technology Research Center, Beijing 100088, China;
4. Steel Structure Branch, China Jingye Engineering Technology Co., Ltd., Beijing 100088, China

Received Date: 2024-05-16
Available Online: 2024-11-06

Abstract

Abstract

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.
- fire-resistant steel Q235FRB,
- elevated-temperature environment,
- experimental research,
- mechanical properties

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References(24)

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