DIAPHRAGM ACTION OF SANDWICH PANELS IN PIN-JOINTED STEEL STRUCTURES: A SEISMIC STUDY |
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Authors: | GIANFRANCO DE MATTEIS RAFFAELE LANDOLFO |
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Affiliation: | 1. Department of Structural Analysis and Design , University of Naples Federico II, P. le Tecchio, 80 , 80125, Napoli, Italy;2. D.S.S.AM., University of Chieti G. D'Annunzio, Viale Pindaro, 42 , 65127, Pescara, Italy |
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Abstract: | The paper focuses on the seismic response of steel pin-jointed frames braced by lightweight cladding panels. In particular, with the aim to investigate the performance of such a structural scheme when acting as a dissipative system, a wide numerical study has been developed. It is based upon available shear tests on screwed sandwich panels, whose experimental cyclic responses are properly incorporated into a scope-oriented, computer program. The goal is firstly to check the possibility of using cladding panels as shear diaphragms in seismic areas and then to assess an appropriate design behaviour factor, accounting for their actual hysteretic response. Key findings from the nonlinear dynamic analyses are: (1) a portal frame steel building in a low-medium seismicity zone may be braced by common cladding panels, completely avoiding the use of other bracing systems; (2) this structural solution, if compared with a conventional one, appears to be more efficient and cost-effective, giving rise to a weight saving which, in the case under examination, reaches a value of about 20%; (3) on the basis of the numerical study a design behaviour factor q d =2 seems to be realistic for such a structural typology. |
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Keywords: | Dissipative system q-factor hysteretic model sandwich panels seismic analysis stressed skin design |
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