Experimental study on seismic performance of concrete-encased column reinforced with multiple steel sections
Concrete-encased columns reinforced with one built-up steel core are widely used as mega columns in high-rise buildings.Due to the large size of the steel core and the limitation of lifting capacity,multiple core segments are welded and spliced on-site,which might impact the integrity and ductility of the columns.To address this issue,one method using multiple individual steel sections to replace one gigantic built-up section is proposed to increase the erection length of each segment,thus,reducing the number of splicing locations within the columns.A quasi-static cyclic lateral load was applied to the specimens to investigate the seismic performance of the columns subjected to combined vertical force and bending moment.The maximum load capacity,ultimate deformation,energy dissipation and stiffness degradation were analysed.The test results show that compared to the specimen with one steel section,the specimen with multiple steel sections exhibits similar performance in terms of maximum shear force and ultimate deformation and could dissipate considerable amount of energy under cyclic loading.Also,a sudden loss of lateral stiffness is not observed in the specimen with multiple steel sections after the peak shear force.At an eccentricity ratio of 20％,the strain distribution of the steel sections remains relatively linear,indicating that the strain compatibility is still valid.
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