Seismic design of steel frames with partial strength connections

The seismic behaviour of moment-resisting steel frames incorporating partial strength connections is discussed in this paper. Particular emphasis is given to beam-to-column connections consisting of bolted angles. Significant findings from a recent experimental investigation on bolted steel frames subjected to monotonic, cyclic and earthquake loading are presented. The main parameters required for the seismic design process are then identified and examined. These include connection properties as well as overall frame response characteristics. It is concluded that this type of frame may be used effectively in earthquake-resistant design. By appropriate use of the energy dissipation and ductility of the connections, considerable advantages, in terms of frame design as well as practical considerations, may be gained.