Dynamic response of Q460 high strength steel column under near explosion load
ZHANG Xiuhua1, ZHANG Weijia1, ZHANG Yu2
1. School of Civil Engineering , Northest Forestry University, Harbin 150040, China;
2. School of Architecture and Civil Engineering, Qiqihar University, Qiqihar 161003, China
Abstract:The finite element models of steel column were established by ANSYS/LS-DYNA.The dynamic responses of Q460 high strength steel columns under explosion load were simulated by fluid-solid coupling method. On the basis,a piecewise equivalent triangular wave calculation method is proposed to apply explosive load to the structure/member, and the major influencing factors were numerically analyzed.The results show that the piecewise equivalent triangular wave calculation method is in good agreement with the fluid-solid coupling method, and the feasibility of that is verified. The blast wave with high velocity, high peak load and short duration has strong destructive force on the steel column. The greater the steel strength grade, the stronger the steel column's ability to resist deformation. The lower the explosive position,the easier the shear failure of the column foot. The flange, as the blasting surface, is more resistant to explosion shock. Properly reducing the width to thickness ratio of flange and web can enhance the ability of steel column to resist dynamic load.The piecewise equivalent triangular wave calculation method can provide further reference for the study of explosion resistance.
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