Nonlinear Elastoplasticity Stability of CFST Column Subject to Compression

Based on the U.L. formula of element incremental balance equation, the elastoplasticity stiffness matrix of CFST column elements is established using plastic coefficient method of element cross-sec-tion force. A computer program for analyzing ultimate load of nonlinear elastoplasticity stability of CFST col-umn subject to compression is also developed. The presented method and program are then validated using data in the literature with an excellent agreement.