Abstract: Considering the core slag concrete strength,steel ratio,substitution rateof slaglump as experimental parameter,through the axial test on 12 thin-walled steel stub columns filled with slag concrete and large-scale slag the context analyzed the collapse mode and mechanism,axial load-displacement relationship of the new short columns,also discussed the impact of axial bearing capacity of three factors of the new short column.The result shows that all specimens have occurredshear destruction,and specimens have high axial compressive bearing capacity and the ability to resist deformation;The influence of the core slag concrete strength grade on the axial compression bearing capacity of the new short columns is the largest,followed by the steel ratio,and the least influence is substitution rateof slaglump.Research results indicate that thin-walled steel stub columns filled with slag and large-scale slag have more advantages in capacity,ductility,it is worthy of further research and extension applications.

Key words: thin-walled circular steel stub columns;slag concrete;large-scale slag;experimental study;bearing capacity