Seismic Design of Steel Frames Equipped With “Freedam” Connections

Abstract eng:
The paper presents a design approach based on the Theory of Plastic Mechanism Control (TPMC) finalized to provide a procedure for the design of MRFs equipped with friction dampers both at beam-to column connections and first storey base section. The introduction of such dissipative devices in correspondence of the dissipative zones that has to be involved in plastic range, provided that a collapse mechanism of global type is assured, belong to the supplementary energy dissipation strategies. The use of the TPMC as the design tool is able to assure that only the zones equipped with the dissipative devices are involved in plastic range. The devices herein presented have been developed in the framework of the project “FREEDAM” that deals about free from damage connections equipped with pads of friction-al materials. In particular, the friction devices of beam-to-column connections are located at the bottom flange level while column-base connections are conceived to transmit the bend-ing moment only. Finally, the proposed design approach is herein presented with reference to a 3bay-4storey moment-resisting frame. The investigation of its seismic performances has been carried out by means of both push-over and IDA analyses. These last ones, refer-ring to a set of 10 recorded ground motions, show the high values of spectral acceleration and peak ground acceleration the structure is able to withstand without yielding.

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