Abstract
This paper theoretically investigates the dynamic buckling characteristics of imperfect columns subjected to axial intermediate velocity impact loads. Based on the observations of tested columns under intermediate velocity fluid–solid impact, the dynamic buckling equation of imperfect columns is simplified and solved. A theoretical solution of the equation is derived. According to the characteristics of the theoretical solution, a dynamic buckling criterion is proposed to determine the critical buckling condition and to estimate the dynamic buckling critical load. Results obtained in the present study agree well with the experimental and numerical results. Effects of the initial imperfection, slenderness ratio of columns and dynamic load duration on dynamic buckling properties of columns under intermediate velocity impact are also discussed in the present study.
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