Abstract
In this research, three structural design concepts are integrated: the use of compositeconcrete-filled tube (CFT) columns, the use of partially restrained (PR) connections andthe introduction of innovative materials (shape memory alloys) in the connection design.These concepts are used to enhance the robustness and performance of composite-specialmoment frames. These innovative connections intend to exploit the recentering propertiesof super-elastic SMA tension bars, the energy dissipation capacity of low-carbon steel barsand the toughness of CFT columns. PR-CFT connection prototypes were designed basedon a hierarchy of strength models for each connection component. Simplified user jointelements based on the mechanical modeling approach were formulated in an effort tosimulate the realistic behavior of bolted connections. The application of new connections tolow-rise PR composite frames is illustrated by designing four buildings in both 2D and 3Dfor the western US region. The performance of these composite frames was comparedwith those with conventional welded frames in terms of strength, ductility andrecentering behavior. In all three areas, frames with the PR composite connectionsshowed superior performance. This is due primarily to the capability of this systemto redistribute inter-story drift more evenly through the height of the frame.
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