Damage Effect Analysis of HSection Steel Columns Subjected to Synergistic Effects of Blast and Prefabricated Fragments

Abstract:

In order to investigate the antiblast performance of Hsection steel columns at blast and prefabricated fragments, the damage effect of the combined blast and fragments loads on the Hsection steel column is simulated by arranging the prefabricated fragments around the cylindrical TNT based on the nonlinear finite element software ANSYS / LSDYNA .The difference of dynamic response of Hsection steel columns at blast load, fragments load, and combined blast and fragments load is analyzed. Meanwhile, the influence of axial compression ratio, steel strength, slenderness ratio, and cross section type on the dynamic response of the steel column at combined blast and fragments load is investigated by using the parametric analysis method. The research indicates that the combined effect of blast and prefabricated fragments under adjacent explosion has a superposition enhancement effect and the combined load is bigger than the linear superposition of single load effect. In the antiblast design of steel columns, the value of the axial pressure should be controlled, and when the steel strength grade is Q235 the axial compression ratio should not be bigger than 0.4. It is reasonable to choose steel strength instead of blindly choosing highstrength steel. By changing the column height to change the slenderness has little effect on the steel column. Tubular crosssection steel column has the best antiblast ability, followed by Hsection and box section.