Research On Behaviors Of Cross-Section SRC Columns Under Blast Loading

Now not only the terrorist attacks in the impact of the building structure of the security,accidental explosion also to some extent,affect the safety of the building structure.In the event of explosion,as the main load-bearing structure that beam or column has been damaged,will lead to structural damage or even lead the collapse of the stucture.Therefore,in this paper the finite element software ABAQUS is used to simulate the behavior of cross section steel reinforced concrete columns under blast loading.To study the anti-explosion performance of the cross section steel reinforced concrete column and its frame structure,the material parameters were transformed for the study and analyses.The main contents of this paper are as follows:(1)The major explosion happened in recent years at home and abroad is briefly described,and the harm caused by explosion is discussed.Summarize the research on the anti-blast performance of the structure at home and abroad,and the special-shaped column combined structure is briefly introduced.In line with the reference literature,the basic characteristics of blast loading are analyzed,and the relationship between the peak time and the duration of shock wave overburden is selected.Also the triangular explosion load model based on the relationship between the duration t0 and the overpressure peak pressure Ps0,and this model is applied to the ABAQUS dynamic finite element analysis.(2)In the numerical simulation analysis of the finite element software ABAQUS,the steel material in the cross-section steel reinforced concrete column adopts the classical metal plasticity model,the concrete material adopts the Concrete damaged plasticity.Concrete material is used in the software comes with concrete damage plasticity model.In the interaction of the material,steel cage and steel cross-section is completely embedded in the concrete material.(3)The study mainly concerning the aspects of the influence of the steel ratio,working conditions,the stirrup ratio,slenderness ratio and limb thickness on the behavior of steel reinforced concrete columns with cross section under blast loading.The results show that the anti-blast performance of the cross-section steel reinforced concrete columns is improved when the steel ratio increases,the hoop rate increases,and the limb thickness increases.The increase of slenderness ratio decreases the anti-blast performance of the cross-section steel reinforced concrete.(4)In the numerical simulation analysis of the cross-section steel reinforced concrete column frame structure under the action of blast loading,the three aspects of working conditions,column-end encryption and longitudinal reinforcement diameters were analyzed.From the simulation results,it can be known that the column ends of the special-shaped column frame structure are encrypted or increase the diameter of the longitudinal reinforcement in the column,which will have a favorable impact on the anti-blast performance on the special-shaped column frame structure.