Finite Element Analysis On Dynamic Response And Damage Mode Of Tube-confined Concrete Column Under Explosion

In recent years, the world’s terrorist bombing and accidental explosion occurredfrequently, people’s production and living the life and property are caused greatdamage. How to effectively reduce the damage of structure under the action of theexplosion shock occurred has become the world researchers are facing an importantand urgent research subject. Our country as emerging economies, with thedevelopment of the civil engineering construction, the important buildings and allkinds of large-scale civil building is an urgent need to improve antidetonating quality.Steel tube concrete members have high bearing capacity, good toughness andconvenient production and construction, has been widely used in modern engineering,research concrete filled steel tubular structures of antiknock performance to ensure thesafety of the structure of antiknock has very important practical significance. In thispaper, the structure of concrete filled steel tube column under explosion shock load ofthe systemic research on the dynamic response characteristics and failure modes, themain work includes the following aspects:(1) Using ANSYS/LS-DYNA analysis software, set up include air, explosives,coupling system model of concrete filled steel tube column, analyzes the shape ofexplosive, explosive and air mesh size effect on explosion shock wave calculationaccuracy, in the case of equilibrium calculation accuracy and computational resources,the optimal form of modeling is proposed. On this basis, through parametric analysis,under the action of the explosion shock is studied in the dynamic response of concretefilled steel tube column with the position, column section shape, constraints, formexplosive properties, slenderness ratio, steel, steel tube wall thickness, axialcompression ratio of several different factors. Increase steel pipe through the studyfound that the material yield strength, reduce the column slenderness ratio, increasethe steel tube wall thickness can increase pillars in different explosive height,constraints, form and the cross section shape of the maximum lateral displacementunder the condition of; In the same condition, the round steel tube concrete columnantiknock performance is better than that of square concrete-filled steel tube column,can more effectively reduce explosive shock wave acting on the pillars.(2) The parametric analysis of the different column section, the form ofconstraints, explosive height of eight basic model to analyze the failure mode. Theresults show that different forms of constraint and explosive height on the failureprocess of concrete filled steel tube column and form different, square steel tubecolumn distance from blasting source place, circular column steel tube withoutdamage. Core concrete are serious damage, but the former damage area is less thanthe latter. Circular column antiknock performance due to the square column.