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FINITE ELEMENT ANALYSIS OF SQUARE CONCRETE-FILLED-TUBE COLUMN UNDER CYCLIC SHEAR-BENDING CONSIDERING COMPRESSIVE DAMAGE OF CONCRETE

A finite element analysis of a square concrete-filled-tube (CFT) column under cyclic shear-bending loading is conducted. The concrete constitutive model proposed by the authors, which has extended Drucker-Prager yield surface and a simple damage criterion for representing softening behavior in compression, is updated. A reproducing analysis of a static cyclic bending experiment of a CFT column is performed. The load-deformation relations obtained from the experimental and numerical results are compared. From the numerical result, the damage progress of the filled concrete and the steel-concrete interaction are visually illustrated and discussed.