Pseudo-static tests of terminal stirrup-confined concrete-filled rectangular steel tubular columns

摘要: Abstract This paper mainly presents a pseudo-static test program on 12 terminal stirrup-confined square concrete-filled steel tube (SCFT) columns and 14 rectangular SCFT under constant axial pressure. The effects of various factors the hysteretic behavior specimens are investigated. These include with or without stirrups, height stirrup region, equivalent ratio, form, loading direction, height-length ratio (L/B), length-width (B/D), compression (n) sliding support. failure mode, strain curve, skeleton ultimate bearing capacity, ductility, stiffness degradation, energy dissipation, as well residual deformation analyzed. results indicate that: (1) When n is relatively larger, bidirectional stirrups can effectively delay local buckling greatly increase stiffness, damping viscosity index, rate ductility further significantly improve seismic columns; (2) Axial pressure confinement effect from to core concrete, also directly confine concrete decrease tube; (3) With same value n, increasing region (4) influence L/B B/D not obvious.