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

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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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Abbreviations

a :

Web length

b f :

Flange width

b ts :

Transverse stiffener width

COV:

Coefficient of variation

E :

Elastic modulus

F cr :

Critical strength

F EN (F EN,T):

Design strength determined from EN 1993-1-5

F FE (F FE,T):

Ultimate strength obtained from FE simulation results

F P,T :

Predicted strength determined from the proposed formula

F test :

Ultimate strength obtained from test results

h w :

Web height

K F :

Critical buckling factor

M:

Mean value

MAX:

Maximum value

MIN:

Minimum value

SD:

Standard deviation

S s :

Loading length

T :

Elevated temperature

t f :

Flange thickness

t ts :

Transverse stiffener thickness

t w :

Web thickness

γ M 1 :

Partial safety factor

λ F :

Slenderness parameter

f yf :

Flange yield stress

f yw :

Web yield stress

χ F :

Strength reduction factor

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Acknowledgements

This study was financially supported by the Chongqing Science and Technology Commission (cstc2021yszx-jcyj0003) and the National Natural Science Foundation of China (51878096, 52378132, and 52308143).

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Authors and Affiliations

  1. School of Civil Engineering, Chongqing University, Chongqing, 400045, China

    Yu Shi, Zeqiao Luo & Xuanyi Xue

  2. Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing, 400045, China

    Yu Shi & Zeqiao Luo

  3. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China

    Xuanyi Xue

  4. Shandong Rui Xiang Architectural Design Institute Co., Ltd, Shandong, 276800, China

    Quantao Ma

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Shi, Y., Luo, Z., Xue, X. et al. Numerical Investigation and Design Suggestion on Patch-Loading Strength of Q690 High-Strength Steel Plate Girders at Elevated Temperature. Fire Technol 60, 545–577 (2024). https://doi.org/10.1007/s10694-023-01529-x

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