Seismic Performances of Mrf-Ebf Dual Systems: Influence of Brace Geometry

Abstract eng:
The work herein presented is devoted to the evaluation of the influence of the brace geometry on the seismic performances of Moment Resisting Frames-Eccentrically Braced Frames (MRF-EBF) dual systems designed by means of the Theory of Plastic Mechanism Control (TPMC). Even though TPMC design approach is still not introduced in modern seismic code, it has earned the reputation of being a very robust method, based on kinematic theorem of plastic collapse, able to assure collapse mechanism of global type. Conversely, the design approach proposed by Eurocode 8 (EC8), following the rules given by the other modern seismic codes, promotes the application of the so-called beam-column hierarchy criterion which is able to avoid soft-storey mechanisms, but is not able to assure the yielding of all the dissipative zones, because a collapse mechanism of global type is usually not attained. The main purpose of the present work is to compare, given the design approach, the different performances affecting structures with four different brace geometry of the eccentrically braced part of the seismic resistant scheme. For this reason, 5 bays structures with 4, 6 and 8 storeys have been considered for the four link configurations for a total number of 12 structural schemes. The seismic performances have been evaluated by means of both push-over and Incremental Dynamic Analyses (IDA) carried out until the achievement of the structural collapse.

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