ABSTRACT
This paper aims to study the eccentric compressive behaviour of Concrete-Filled Double Skin steel Tubes (CFDST) with dodecagonal section. Totally seven specimens with the length of 2000-mm were tested. The mechanical behaviour of these composite columns such as the load-vertical displacement, load-strain, load-lateral displacement and distribution of lateral displacement were investigated. The parameter study with respect to diameter to thickness ratio was conducted by finite element analysis. Finally, the ultimate strengths for the circular section CFDSTs under eccentric compressive load were calculated by current design equations such as Han’s method and AISC standard 360–10 and were compared with the test results. The comparison shows the predicted results proposed by Han is larger than the test results, while the design equations proposed based on AISC standard 360–10 is conservative.
