Abstract
The chapter discusses the ultimate capacity of rectangular concrete-filled tube (CFT) columns with high-strength concrete. CFT columns are increasingly being used as structural members since filling a steel section with concrete results in an increase in both strength and ductility, without increasing the section size. In the current LRFD Specification, the strength of in-filled concrete is limited to a maximum of 55 MPa. Some of the previous works in CFT columns that are related to this study include the SSRC Task Group 20 that proposed a specification for the design of steel-concrete composite columns as a part of AISC Specifications, and the ultimate strength design format is provided. Liu, Gho, and Yuan studied 22 rectangular CFT stub columns subjected to axial concentric loading, and the ultimate loads obtained from the experiment are compared with the values calculated from design codes, namely, EC4, AISC, and ACI respectively.
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