Abstract
To research the impact of inner concrete filled steel tubular (CFST) on the reinforced concrete (RC) pier confined by stirrups, a Matlab program based on fiber model was written to calculate the moment-curvature (M-ϕ) relationship. The program was utilized to compute theM-ϕrelationships of three piers with same longitudinal bars and stirrups, and the three piers were an ordinary RC pier confined by stirrups、a high strength reinforced concrete (HSRC) pier confined by stirrups and a steel tube-reinforced concrete (ST-RC) pier respectively. The rules about bearing capacity of section and curvature ductility along with axial loadNwere deliberated by comparing the numeral results of three piers. The ratio of peak momentMkto yield momentMywas defined as super coefficientλs, and the disciplinarian ofλsalong withNwas discussed. Participation factorξreferred to the ratio of the moment provided by inner CFST to the total moment of ST-RC pier, and the laws ofξaffected byϕandNwere researched. The results show that ST-RC pier has higher ductility and higher bearing capacity of section, and ductility decreases more slowly than other piers with the increase ofN.λsof ST-RC pier is highest among three piers in most cases. On conditions of differentN,ξshows different variation trend with curvatureϕup, and the maximum of participation factorξmaxis reckoned to be not affected byNbasically.
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