Seismic performance and design of composite moment-resisting frames

• Type: Article in International Conference Proceedings Book
• Date: 2006

Authors

José Miguel Castro (Author) FEUP; A. Y. Elghazouli (Author) Other; B. A. Izzuddin (Author) Other

Conference proceedings International

Title: First European Conference on Earthquake Engineering and Seismology

First European Conference on Earthquake Engineering and Seismology (a joint event of the 13th ECEE & 30th General Assembly of the ESC)

Genebra, Suiça, 3 a 8 de Setembro de 2006

Scientific classification

CORDIS: Technological sciences > Engineering > Civil engineering > Structural engineering

Other information

Abstract (EN): Composite steel-concrete structures are widely employed in Europe and elsewhere due to their relative merits in comparison with other systems in terms of structural behaviour as well as speed and efficiency of construction. In particular, under seismic loading, the favourable performance of composite frames due to enhanced strength and ductility has been recognized for many years. Consequently, most seismic codes provide specific provisions for the design of various composite frame configurations. In Eurocode 8, seismic design of composite structures is based on traditional force-based principles which adopt the concept of behaviour (or force reduction) factors to reduce the elastic strength demand in accordance with the expected ductility capacity. For the particular case of moment-resisting frames, the behaviour factors proposed are the same as those provided for steel frames. This simplified approach however does not account for the significant overstrength observed in composite structures. The level of overstrength can be shown to be directly related to gravity loading design requirements. In order to assess the levels of overstrength present in typical composite moment-resisting frame systems, a five-storey structure designed according to Eurocode 8 is analysed. The results from nonlinear static analysis reveal that the response of composite moment-resisting frames designed according to Eurocode 8 can be significantly different from that predicted by the code. This points out to the need for further modification and refinement of design approaches.

Language: Portuguese

Type (Professor's evaluation): Scientific