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Стійкість сталевої колони коробчатого перетину з рахуванням зварювальних залишкових напружень при високих температурах [Електронний ресурс] = Stability of Box-Section Steel Column Considering Welding Residual Stress at High Temperatures / Y. Q. Fu, Y. Zhang, D. Zhang, J. S. Ju
// Проблеми міцності. – 2022. – № 1. – С. 53-60. – DOI: https://doi.org/10.1007/s11223-022-00381-8.
This paper presents the effect of residual welding stress on the ultimate stability bearing capacity of the box-section steel column. FEM method is employed to investigate the stability characteristics of box section steel column whose whole length is under high temperature. Firstly, the distribution of the initial longitudinal welding residual stress of the column is calculated. Secondly, the effect of high temperature along the whole column length due to fire on the residual welding stress is investigated. The results indicate that the increase in temperature could cause the relaxation of the longitudinal seam residual stress. When the temperature is less than 244°C, the residual stress relaxation could not decrease the ultimate load-carrying capacity. The ultimate load-carrying capacity could decline remarkably as the temperature increases while the temperature is higher than 244°C. In addition, the initial geometric defects weakly affect the ultimate stability bearing capacity, and the reduction factor of the column gradually declines as the slenderness ratio increases. |
