Study On The Performance Of Box-shaped Steel Columns Under Blast Loading

Along with the continuous improvement of social and the rapid development of science technology, people's material life and the spiritual realm has been a qualitative leap and sublimation. So people are enjoying the great convenience brought about by the social as well as under the never to predict. In particular, the recent terrorist bombings and the frequent occurrence of accidents are not only affects people's normal life, but also to the spirit ofthe people causing irreparable injury. In addition, there are some limitations for the study of the explosion, for example, the research of the explosion problem can only collect very limited test data under huge cost and high risk.In recent years, box-type steel column has been widely used in modern architecture as to its material uniform, light weight, high strength, good plasticity and toughness, easy to manufacture, simple construction and energy saving, especially its unique excellent anti torsion stiffness and bidirectional stability. However, there are still many problems need to be further studied in the dynamic performance of box shaped steel columns under blast loading.So,it is very important to study the failure mode and dynamic response of box steel column under blast load.The paper use the software ANSYS / LS-DYNA to analysis and research the steel box column's failure pattern and the rule of the dynamic response under the action of explosion, and chose entity unit model and the plastic kinematic hardening material model for the box-shaped steel columns, which will simplified explode loads as equivalent triangle wave loads on the box-shaped steel columns.In the process of research, the first step is to verify the numerical model which has been got by an equivalent single degree of freedom theory, after that, to verify the model as the foundation, through the finite element simulation of explosion under the action of steel box column dynamic response is analyzed and studied,: the variation of column moment, column end shear and column displacement; according to the simulation results we can get that the box-shaped steel columns local deformation damage, direct shear failure, the overall bending failure three kinds of failure modes and their failure characteristics and rules under explosion loads. Finally, in order to effect of the in-depth understanding of the component itself and load parameters on the anti explosion performance of box steel column, the explosion of steel box columns carried out parameter analysis, we study the changing of the load impulse, peak overpressure, generous ratio, slenderness ratio, and axial compression ratio's influence on steel column antiknock performance. We receive that, when the load impulse smaller but the peak overpressure is relatively larger, the box-shaped steel columns generally occurs local deformation; when the load impulse and peak overpressure is relatively larger, box type steel column will occur the overall bending deformation and failure, or local deformation and bending deformation joint broken as a whole; when load impulse and peak overpressure is very large, the most likely failure model is Punching destruction of the foot;along with the increase of generous ratio and slenderness ratio, the horizontal displacement and deformation of columns increases andeasy to failure; the reasonable control of the axial compression ratio can improve the antiknock performance of steel column.The results of this study on steel box column antiknock design provides some reasonable, scientific and valuable data and informationfor later exploded under the action of columns, beams and other components and the entire building structure of anti explosion research, explosion-proof design.