Abstract
The behavior of beam-to-column connections is crucial in the design of a steel moment frame, since large resultant forces and stress concentration can take place there.The elastic design based on the analytical study of stress concentration has been the standard method for the connections.However, such a design approach is not practical against large earthquake, and much remains to be researched for establishing the seismic design of connections.In the present study, connections with.several types of haunch are analyzed numerically.The results show that a haunch influences the strength and the ductility of a connection considerably; the way it works depends on the size and the yield strength of the haunch.
