Abstract
This chapter describes ongoing research associated with the seismic behavior of moment connections for concrete filled tubes (CFT) column-to-wide flange (WF) beam framing systems. The objective of this multiphase research program is to assess the force transfer mechanism in these type of connections, examining the effect various structural details have on this mechanism, and on the connection's strength, stiffness, and ductility. The first phase of the program has been devoted towards assessing the shear capacity of the panel zone in a CFT under simulated seismic lateral load conditions. The results from tests show that a CFT panel zone possesses exceptional ductility, including specimens without interior diaphragms. In addition, a capacity equation based on the superposition of the shear strength contribution of the steel tube and concrete core within the panel zone provides a prediction that agrees reasonably well with specimen strength. The second phase of the program is also discussed, which is currently in progress and associated with full scale structural connection subassemblage tests.
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