Experimental Study On Seismic Performance Of Composite Column With Embedded Precast High-strength Concrete Filled Steel Tube Core Column

The idea of designing the composite column with embedded precast high-strengthconcrete filled steel tube core column is to set up a circle or quadrate steel tube in theconcrete core column. The steel concrete core column is produced by applying theprefabrication of steel tube and high-strength precast concrete, and this structure formcan effectively improve the seismic performance of columns under high axialcompression ratio, meanwhile greatly enforce the deformation capacity of the column.In this paper, the author makes a comparative study between four compositecolumn with embedded precast high-strength concrete filled steel tube core columnswith the shear span ratio equaling2, and one common reinforced concrete column withthe same parameters of1. The focus of this research is putting on the influence of highstrength concrete filled steel tube column on the seismic performance of the corecolumn. The research mainly deals with the factors which affects the seismic functionof built-in high strength steel tube in composite concrete prefabricated core column,such as the high strength steel tube concrete core column and the stirrup spacing ratioand stud etc.Through careful study on the crack development, the failure patterns, hysteresiscurve and skeleton curve of specimens, the conclusion can be drawn that the seismicperformance of built-in high strength steel tube in prefabricated composite concretecore column is significantly better than ordinary reinforced concrete column in theaspect that composite column with embedded precast high-strength concrete filled steeltube core column owns better ductility, strength degradation, and energy consumption.However, through the experimental analysis of results, it can also be seen that the increase of core column pillar tension capacity is not apparent, and in the rigiditydegradation performance, the composite column with embedded precast high-strengthconcrete filled steel tube core column and common reinforced concrete column havelittle difference.Through comparative analysis of the composite column with embedded precasthigh-strength concrete filled steel tube core column of different parameters, it can beconcluded that the influence of the stirrup spacing of the composite column on theseismic performance are more prominent, that is, when the stirrup spacing is small, theseismic performance of the specimen is better; At the same time, in the steel tube wallof the stud welding composite column, the seismic performance is more excellent thanany other composite column.Based on the balanced internal force when damaging the limit, the author deducedthe axial compressive ratio of composite column with embedded precast high-strengthconcrete filled steel tube core column, the author further applies this formula tocalculate the eight composite column with embedded precast high-strength concretefilled steel tube core columns with different parameters. The results show that the axialcompressive ratio improves in proportion to the improvement of the core steel ratio;also, it varies with the core column size and the level of strength increase in the corearea of the concrete.