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Investigation on Mechanical Behavior of I-Section Steel Columns After Elevated Temperature

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Abstract

This paper presents the experimental and numerical investigations on mechanical behavior of I-section steel columns after elevated temperature exposure. A total of twenty-six compression tests were carried out, in which one was under ambient temperature and the other twenty-five were under heating and cooling phase to study the influence of high temperature (400, 550, 700, 850, 1000°C) and high temperature duration (0.5, 1, 1.5, 2, 2.5 h) on mechanical behavior of the specimens. The failure pattern, axial load versus strain relation, axial load versus displacement relation and ultimate strength of the specimens were presented and analyzed. The test results showed that, high temperature duration had limited influence on the ultimate strength and other mechanical behaviors of the specimens, while the ultimate strength decreases with the increase of the maximum temperature the specimens suffered and some other behaviors also changed. The failure pattern of specimens after high temperature did not change compared with that of specimens under ambient temperature. The finite element models that have the same geometry with the test specimens were set up to compare with the test specimens and the results predicted from finite element analysis showed good agreement with that measured in test. Therefore, parametric study was carried out to investigate the influence of different section geometry on the ultimate strength of I-section steel short columns after elevated temperature. A new relationship for the ultimate strength for I-section steel short columns after elevated temperature was developed and proved to be reliable and accurate. What’s more, the effect of slenderness ratio on the stability coefficient of the columns was also investigated in the parametric study.

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Abbreviations

T :

Maximum temperature the specimens suffered

t :

High temperature duration

h :

Section height of the specimens

b :

Width of flange plate of the specimens

d1:

Thickness of web of the specimens

d2:

Average thickness of flange plate of the specimens

L :

Height of the specimens

P :

Axial load

ε :

Strain of the specimens

Δ :

Displacement of the specimens

P 0 :

Ultimate strength of the specimen without high temperature exposure

P u :

Ultimate load of specimens after high temperature

P y :

Yield load of specimens after high temperature

k :

Initial stiffness of the specimens

Δu:

Displacement of the specimens corresponding to the ultimate load

Δy:

Displacement of the specimens corresponding to the yield load

P1:

Average ultimate strength of specimens at a certain temperature

γ :

Load bearing capacity coefficient

f y :

Yield strength of the Q235 steel after high temperature

f u :

Ultimate strength of the Q235 steel after high temperature

δ :

Elongation of the Q235 steel after high temperature

E :

Elastic modulus of the Q235 steel after high temperature

α :

Height-to-thickness ratio of web of the finite element models

β :

Width-to-thickness ratio of flange of the finite element models

h :

Height of web of the finite element models

b :

Width of flange of the finite element models

F u :

Calculated ultimate load

f y0 :

Yield strength of the Q235 steel under room temperature

F m :

Ultimate strength obtained from the parametric study

COV:

Coefficient of variation

Λ :

Slenderness ratio of the column

N m :

Load bearing capacity of the columns with different slenderness ratio

Ψ :

Stability coefficient

ψ m :

Stability coefficient obtained from FEA

ψ u :

Stability coefficient obtained from the formula

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Acknowledgements

This research work was supported by the National Natural Science Foundation of China (Nos. 51478047 and 51778066) and Hubei Province Outstanding Youth Science Foundation of China (No. 2017CFA070).

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Authors and Affiliations

  1. College of Civil Engineering, Fuzhou University, Fuzhou, 350116, China

    Yu Chen

  2. School of Urban Construction, Yangtze University, Jingzhou, 434023, China

    Yu Chen, Wentao Xie, Shaohua Han & Kai Wang

Authors
  1. Yu Chen
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  2. Wentao Xie
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  3. Shaohua Han
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  4. Kai Wang
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Correspondence to Yu Chen.

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Chen, Y., Xie, W., Han, S. et al. Investigation on Mechanical Behavior of I-Section Steel Columns After Elevated Temperature. Fire Technol 54, 503–529 (2018). https://doi.org/10.1007/s10694-017-0694-7

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  • DOI: https://doi.org/10.1007/s10694-017-0694-7

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