Seismic performance of seismic-damaged concrete-filled precast concrete tube columns strengthened by steel jacket and CFRP
To study the seismic performance of seismic-damaged concrete-filled precast concrete tube(CFPCT)columns,which were strengthened by steel jacket and carbon fiber reinforced polymer(CFRP),cycling loading tests were conducted on 11 seismic-damaged CFPCT columns and one seismic-damaged reinforced concrete short column.The test parameters include the steel tube thickness,quantities of CFRP sheets,axial compression ratio,shear span ratio and concrete pouring methods.The effects of these parameters on the failure mode,hysteretic behavior,bearing capacity and energy dissipation of the test specimens were studied.The results show that with the use of high-strength non-shrink grout,both retrofitting methods achieve the purpose of rapid repair and restore the function of the specimens.The failure modes of specimens are shear failure.The bearing capacity of seismic-damaged short columns can be restored to the original level after retrofitting.The ultimate displacement angle of some specimens are increased by more than 100％.Deformation capacity of strengthened specimens are all significantly improved.This paper also established a formula to calculate the shear bearing capacity of the retrofitted CFPCT columns and the results obtained from the formula are conservative compared to the test values.
万方数据
维普
