Design of square and rectangular CFST cross-sectional capacities in compression

Eurocode EN 1994-1-1 currently covers design of concrete-filled steel tubular (CFST) columns using normal strength materials with nominal yield (fy) not more than 460 MPa and concrete characteristic cylinder less 50 MPa. As high have been increasingly used in construction, this paper aims to extend current equation for square rectangular CFSTs incorporate materials. A comprehensive experimental database consisting 443 CFST stub column test results was developed. Statistical evaluations were undertaken the indicate that cross-section slenderness limit is too conservative can be safely relaxed from 52235/fy 68235/fy. The could extended materials). Then, a reliability analysis accordance 1990 performed evaluate applicability proposed method. It found partial factors are safe even after relaxation limit. However, modification should applied existing an acceptable safety level. Finally, investigation on 10 tests carried out further verify recommendation. recommendation yields satisfactory predictions when compared results.