Abstract
Stiffened Square Concrete Filled Steel Tubular Columns (SSCFST) were proposed to solve the problem that ordinary square concrete-filled steel tubular columns (SCFST) are prone to appear local buckling and poor hysteresis performance before reaching the limits of carrying capacity in 3 cases such as the thin steel tubular wall, the larger diameter to thickness ratio or width to thickness ratio. In order to investigate its hysteresis behavior, based on introducing its basic concept, the manufacturing method was expounded, and the low cyclic loading tests of 15 SSCFST and 1 SCFST with binding bars were carried out. The author observed experimental phenomena, failure process and failure mode, then analyzed hysteresis loop area and energy dissipation of SSCFST columns under reciprocating loading, and discussed the effect of various factors to its anti-seismic behavior. Compared to SCFST with binding bars, SSCFST has superior anti-seismic performance.
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