Dynamic response of Q460 high strength steel column under near explosion load

Here, the finite element model of steel column was established by using the finite element software ANSYS/ LS-DYNA. Dynamic responses of Q460 high-strength steel column under explosion load were simulated by using the fluid-structure interaction calculation method. Then, the piecewise equivalent triangular wave calculation method was proposed to exert explosion load on structure/member, and main factors affecting dynamic responses of the steel column were numerically analyzed. The results showed that the results using the piecewise equivalent triangular wave calculation method agree well with those using the fluid-structure interaction method to verify the feasibility of the piecewise equivalent triangular wave calculation method; blast shock wave has a fast velocity, large peak load, short duration and extremely strong destructive force on the steel column; the higher the steel strength level, the stronger the steel column's ability to resist deformation; the lower the explosive position, the easier the column foot to have shear failure; the flange taken as the surface to face blast can better resist blast impact; properly reducing the width-thickness ratio of flange and web can enhance the ability of steel column to resist dynamic load; the proposed piecewise equivalent triangular wave calculation method can further provide a reference for studying anti-explosion. © 2022, Editorial Office of Journal of Vibration and Shock. All right reserved.