Behaviour factors definition for austenitic stainless steel moment resistance frames
Correu electrònic de l'autorg.cestaristudenti.unisa.it
Tipus de documentProjecte Final de Màster Oficial
Data2023-02-09
Condicions d'accésAccés obert
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Abstract
The next version of Eurocode 8 greatly modifies the regulations for designing steel Moment Resisting Frames (MRF) in order to promote more efficient and safer designs for seismic loads, and even incorporates a specific Chapter for calculating aluminum systems. However, the next edition does not include a Chapter or specifications for stainless steel structures, despite the considerable differences (greater ductility and strain hardening) that this material presents with respect to other steels. In this context, the present work investigates the seismic behaviour of stainless steel MRFs designed according to the intermediate ductility classes (DC2) requirements of the new Eurocode 8. The configuration and design of the structures has been based on a study given in literature. Frames with different heights and three stainless steel grades (austenitic, ferritic and duplex) have been analysed.. The force-based approach has been adopted to design the structures, which is based on reducing the seismic action by a calibrated behaviour factor (q). The numerical models have been created by means of the advanced finite element software Abaqus and different analyses of have been performed to obtain the data necessary for applying the verifications proposed for carbon steel MRFs to the cases of study. Moreover, pushover analyses (non-linear static analyses) have been carried out to estimate the actual behaviour factors (q) of all MRFs. It was found that, for the studied cases, the behaviour factor values are higher than the values given in Eurocode 8. Finally, the design methodology given in Eurocode was compared to the design obtained using the Theory of Plastic Mechanism Control (TPMC). The present work is intended to serve as a starting point for further research into the behaviour of stainless steel structures under seismic actions.
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Behaviour facto ... ment resistance frames.pdf | 2,052Mb | Visualitza/Obre |