Design of concrete filled square steel tubular members

Briefs the design methods for concrete filled square steel tubular members in different codes including LRFD(American), AIJ(Japan), EC4(Europe), GJB(China) compares the calculation results with there obtained through a lot of tests including tests conducted with 158 axial loaded members,15 bending members and 147 compression-bending members, and concludes from analytical results that all the design codes can he used to reasonably evaluate the bearing capacity, but LRFD, AIJ, EC4 are somehow a bit conservative, and GJB' results are in good agreement with tests results.