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11.57: Assessment of the ductile behaviour of CBF structures considering energy dissipation in bolted joints
Author(s) -
Martin PierreOlivier,
Rodier Anthony,
Couchaux Maël,
Kanyilmaz Alper,
Degée Hervé
Publication year - 2017
Publication title -
ce/papers
Language(s) - English
Resource type - Journals
ISSN - 2509-7075
DOI - 10.1002/cepa.384
Subject(s) - dissipation , structural engineering , brace , induced seismicity , dissipative system , context (archaeology) , bolted joint , spring (device) , shear (geology) , eurocode , engineering , geotechnical engineering , geology , physics , finite element method , thermodynamics , petrology , paleontology , civil engineering , quantum mechanics
In dissipative seismic concept according to Eurocode 8, capacity design leads to additional cost for brace connections. In this concept, connections, either bolted or welded, remain elastic during seismic events whereas the braces dissipate energy by yielding and buckling. However the bolted gusset plate connections of braces are able to dissipate energy by sliding, bearing and block shear when minimal requirements are fulfilled. Within the RFCS project Meakado, both experimental tests and numerical simulations have been performed on bolted connections under cyclic actions to assess this potential dissipative mechanisms. An equivalent non‐linear spring model has been calibrated from these results to represent the ductile behaviour of concentrically braced frames (CBF) bolted joints when the non‐ductile mechanisms are prevented. Taking into account this equivalent spring model, the seismic global behaviour of CBF structures in the context of moderate seismicity have been studied both by time history and by push‐over analyses. Finally this paper proposes a calibration of the behaviour factor q of CBF structures when energy dissipation is considered in the bolted connections of braces together with the braces dissipation. The scope of application of these results is discussed.