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See detailHigh strength steel in seismic resistant building frames - HSS-SERF - Final report
Dubina, Dan; Vulcu, Cristian; Stratan, Aurel et al

Report (in press)

The aim of “HSS-SERF” project was to investigate and evaluate the seismic performance of dual-steel building frames, realized from two different steel grades: Mild Carbon Steel (MCS) and High Strength ... [more ▼]

The aim of “HSS-SERF” project was to investigate and evaluate the seismic performance of dual-steel building frames, realized from two different steel grades: Mild Carbon Steel (MCS) and High Strength Steel (HSS). A comprehensive set of dual-steel frames (moment resisting, concentrically and eccentrically braced) were designed, which allowed the identification of realistic member sizes for both MCS and HSS components. Several practical solutions for bolted and welded beam-to-column joints were identified and designed. Further, an extensive numerical program was carried out for the seismic performance evaluation of frames. The ductility and over-strength demands, and q-factors associated with different performance levels were evaluated. Furthermore, experimental and numerical investigations were carried out on joint assemblies and components. Guidelines were elaborated for the conceptual design and PBD of dual-steel frames under seismic actions, and the technical and economic efficiency of dualsteel structures vs. conventional ones were finally evaluated. The main outcomes of the project consist in: (i) development and characterisation in terms of global ductility and over-strength demands of dual-steel frames with composite columns (innovative solutions in European context); (ii) development of design recommendations; (iii) proposal of innovative solutions for beam-to-column joints with composite columns; (iv) recommendation for weld details and appropriate component method design approaches; (v) evaluation of technical and economic efficiency of the dual-steel approach. [less ▲]

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See detail“State-of-problem report prepared for the TC11 meeting held in Valencia on October 2012”
Demonceau, Jean-François ULg; Hjiaj, Mohammed; Aribert, Jean-Marie et al

Report (2012)

The present document summarises recent studies and developments investigating the behaviour of composite frames, for discussion within TC11 Committee. Also, possible aspects to be investigated in future ... [more ▼]

The present document summarises recent studies and developments investigating the behaviour of composite frames, for discussion within TC11 Committee. Also, possible aspects to be investigated in future are identified. The document is organised as follows: • First, the global frame behaviour is considered in § 2; • Then, the structural members which can be met in a composite structure, i.e. the composite slabs, the composite beams, the composite columns and the composite joints, are considered in separate paragraph from § 3 to § 6; • A specific paragraph is also dedicated to the possible long term effects on composite members (§ 7); • Finally, a conclusion is drawn in § 8, summarising recent improvements in the knowledge about composite frame design and possible further developments. A first draft of this document was presented at the TC11 meeting held in Liège on March 2010. The present document is an updated draft to be discussed at the TC11 meeting held in Valencia on october 2012. Remark: the aspects related to the response of composite structures subjected to seismic or fire actions are not reported here as they are covered by other more “transversal” technical committees of ECCS (TC3 for the fire and TC13 for the seismic action). [less ▲]

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