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Fire Technology

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05.01.2024

Numerical Investigation and Design Suggestion on Patch-Loading Strength of Q690 High-Strength Steel Plate Girders at Elevated Temperature

verfasst von: Yu Shi, Zeqiao Luo, Xuanyi Xue, Quantao Ma

Erschienen in: Fire Technology | Ausgabe 1/2024

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Abstract

The patch-loading resistance behaviors of Q690 high-strength steel (HSS) plate girders at elevated temperatures were investigated through a parametric study. The finite element (FE) simulation method was validated with 35 experimental results from the literature. The effects of elevated temperature, web width–height ratio, loading length, and web slenderness were investigated, where 512 FE models were included. A clear reduction in ultimate strength caused by the reduction in mechanical properties was observed with increasing temperature. The effect of elevated temperatures on the stress distribution on the web was negligible. The validation of design procedures in EN 1993-1-5 and AISC 360-16 was conducted, where the elevated temperature material properties of Q690 HSS were used. The results indicated that the current specifications were overly conservative to be used directly to predict the ultimate strength of the Q690 HSS plate girder at elevated temperatures. Accordingly, a design method based on EN 1993-1-5 was proposed. The formula in EN 1993-1-5 for determining the critical buckling factor was modified by introducing an amplification factor. The strength reduction function in EN 1993-1-5 was adjusted using the modified critical buckling factor. To determine the optimal undetermined constants in the strength reduction function, statistical calibration involving 400 combinations of 2 undetermined constants was performed for each pre-determined temperature. Two formulas with temperature as a variable were proposed to determine these undetermined constants directly. Based on the comparison, the accuracy of the proposed design method was better than those of the design methods in EN 1993-1-5 and AISC 360-16.

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Titel: Numerical Investigation and Design Suggestion on Patch-Loading Strength of Q690 High-Strength Steel Plate Girders at Elevated Temperature
verfasst von: Yu Shi
Zeqiao Luo
Xuanyi Xue
Quantao Ma
Publikationsdatum: 05.01.2024
Verlag: Springer US
Erschienen in: Fire Technology / Ausgabe 1/2024
Print ISSN: 0015-2684
Elektronische ISSN: 1572-8099
DOI: https://doi.org/10.1007/s10694-023-01529-x

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