Abstract

Concentrically braced frames (CBFs) represent one of the most efficient lateral-load-resisting systems considering its numerous advantages. Using concrete filled tube (CFT) columns provides many economical and aesthetical benefits; however, it requires the use of complex connections. Many alternatives exist in shape and detailing of these connections. Unfortunately, designers are usually faced by lack of supporting procedures related to modelling, design, and detailing of such connections. An extensive study was performed to investigate behavior of different connection configurations to CFT columns. Summary of research results are outlined. Afterwards, influence of different details on the general performance of CBF with concrete filled tube columns under cyclic loading is investigated through an experimental study. Five concentrically braced frames are tested under displacement-based cyclic loading to evaluate their behavior, lateral drift, load capacity, hysteresis responses, ductility, and stiffness degradation. Connections details include gusset plates welded to the outside shell of steel columns with and without shear connectors. Results are investigated and discussed.

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