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Numerical investigations of fire-resistant steel welded I-section columns under elevated temperatures
Abstract Based on the experimental investigations on compressive buckling behavior of fire-resistant steel columns subjected to elevated temperatures, the numerical analysis models were established and validated by the experimental results of 12 fire-resistant steel columns and 15 conventional steel columns. The parametric analysis was performed to examine the influence of cross-section types, axial load ratios, normalized slenderness ratios, initial imperfections, residual stress and temperature elevation procedure on critical temperatures of fire-resistant steel columns. The parametric analysis indicated that: (1) The critical temperatures increased with decreasing axial load ratios and slenderness ratios; (2) The fire resistance of column with higher axial load ratios and middle slenderness ratios were more sensitive to the residual stress and initial imperfections; (3) Cross-section size and temperature elevation curve variations had less influence on critical temperatures. Furthermore, a total of 1674 numerical simulations were compared with the results determined from the current standards. It was found that provisions in Chinese GB 51249 and European EC 3 tended to overestimate the compressive buckling coefficient while underestimate the critical temperature, when applied to fire-resistant steel columns. Based on Perry-Robertson formula and EC 3 critical temperature formula, the fire resistance determination methods were proposed to facilitate the engineering application of the fire-resistant steel. The proposed methods were proved to meet both safety and economic requirements of structural design.
Graphical abstract Display Omitted
Highlights An efficient numerical modelof fire-resistant steel columns was established and validated. 1674simulations were performed to understand compressive buckling behavior of fire-resistant steel columns under elevated temperatures. Comparing to currentcode provisions, the critical temperatures increased about 20% ~ 30% for WGJ fire-resistant steel columns withN/N0 > 0.5. The modified design methods of fire-resistant steel columns were proposed to meet both safety and economy requirements.
Numerical investigations of fire-resistant steel welded I-section columns under elevated temperatures
Abstract Based on the experimental investigations on compressive buckling behavior of fire-resistant steel columns subjected to elevated temperatures, the numerical analysis models were established and validated by the experimental results of 12 fire-resistant steel columns and 15 conventional steel columns. The parametric analysis was performed to examine the influence of cross-section types, axial load ratios, normalized slenderness ratios, initial imperfections, residual stress and temperature elevation procedure on critical temperatures of fire-resistant steel columns. The parametric analysis indicated that: (1) The critical temperatures increased with decreasing axial load ratios and slenderness ratios; (2) The fire resistance of column with higher axial load ratios and middle slenderness ratios were more sensitive to the residual stress and initial imperfections; (3) Cross-section size and temperature elevation curve variations had less influence on critical temperatures. Furthermore, a total of 1674 numerical simulations were compared with the results determined from the current standards. It was found that provisions in Chinese GB 51249 and European EC 3 tended to overestimate the compressive buckling coefficient while underestimate the critical temperature, when applied to fire-resistant steel columns. Based on Perry-Robertson formula and EC 3 critical temperature formula, the fire resistance determination methods were proposed to facilitate the engineering application of the fire-resistant steel. The proposed methods were proved to meet both safety and economic requirements of structural design.
Graphical abstract Display Omitted
Highlights An efficient numerical modelof fire-resistant steel columns was established and validated. 1674simulations were performed to understand compressive buckling behavior of fire-resistant steel columns under elevated temperatures. Comparing to currentcode provisions, the critical temperatures increased about 20% ~ 30% for WGJ fire-resistant steel columns withN/N0 > 0.5. The modified design methods of fire-resistant steel columns were proposed to meet both safety and economy requirements.
Numerical investigations of fire-resistant steel welded I-section columns under elevated temperatures
Shi, Yongjiu (author) / Tu, Chengliang (author) / Wu, Yiran (author) / Liu, Dong (author) / Meng, Lingye (author) / Ban, Huiyong (author)
2020-10-23
Article (Journal)
Electronic Resource
English
Failure temperatures of steel H-section columns under elevated temperatures
| Springer Verlag | 2014
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| Springer Verlag | 2013