Research On Mechanical Properties Of Cruciform Steel Tube Recycled Concrete Columns Under Explosion And Impact

The special-shaped steel tube column is a combination of reinforced concrete column and concrete-filled steel tube column on the basis of the special-shaped column,which effectively improves the bearing capacity of the column and further meets the needs of practical engineering.At present,for natural and personal reasons,there have been many tragedies in the collapse and destruction of large buildings under the blast load.Nearly ten major global terrorist attacks in the past decade are almost all explosions.Therefore,it is very important to study the anti-explosion performance of cross-shaped steel tube recycled concrete columns.Dynamic impact problems are also often encountered in engineering practice,Columns,as the load-bearing part of the building,are damaged by accidental impact,which is also very important in engineering problems.Therefore,it is very important to study the impact resistance of cross-shaped steel tube recycled concrete columns.In this paper,ABAQUS software is used to model the cross-shaped steel tubular recycled concrete column,and its mechanical performance under blast load and lateral impact resistance is studied.First,the blast resistance of cross-shaped steel tubular recycled concrete column members under different parameters was studied.The different parameters include impact speed,presence or absence of steel pipes,steel pipe diameter,steel pipe wall thickness,longitudinal reinforcement diameter,hoop spacing,Stirrup reinforcement,slenderness ratio,and strength grade of recycled concrete.It is concluded that increasing the diameter of steel pipes,reducing the spacing of stirrups,increasing the density of stirrups,and increasing the strength level of recycled concrete can reduce the lateral displacement of recycled steel tubular columns with cross-sections under blast loading,which helps to strengthen Anti-blast performance of cross-shaped steel tube recycled concrete columns.Secondly,the lateral impact resistance of the cross-shaped steel tube recycled concrete column members under different parameters was studied.The changed parameters were impact speed,impact location,constraint conditions,steel tube wall thickness and strength level of recycled concrete.It is concluded that increasing the constraint conditions,increasing the strength grade of recycled concrete,increasing the thickness of the steel pipe wall,and reducing the impact speed can reduce the lateral displacement of the steel pipe recycled concrete column with cross section under the impact load,which helps to strengthen the cross Impact resistance of steel tube recycled concrete columns.