engleski

Some aspects of structural Eurocodes in earthquake resistant design for buildings (Performance - based seismic design)

Several procedures for non-linear static and dynamic analysis of structures have been developed in recent years. This paper discusses those procedures that have been implemented into the latest European and U.S. seismic provisions: the non-linear dynamic response- history analysis ; the N2 non-linear static pushover method (Eurocode 8) ; the non-linear static procedure NSP (FEMA 356) and improved capacity spectrum method CSM (FEMA 440). The presented methods differ in respect to accuracy, simplicity, transparency and clarity of theoretical background. Non-linear static procedures were developed with the aim of overcoming the insufficiency and the limitations of linear methods, whilst at the same time maintaining a relative simple application. All procedures incorporate performance-based concepts paying more attention to damage control. Application of the presented procedures is illustrated by means of an example of an eight-storey reinforced concrete frame building. The results obtained by non-linear dynamic response-history analysis and non-linear static procedures are compared. It is concluded that these non-linear static procedures are sustainable for application. At the end the extended non-linear static methods are discussed in cases when the influence of higher modes cannot be neglected.

Nonlinear response-history analysis; non-linear static methods; pushover analysis; Eurocode 8; real time-history records; artificial records; the N2 method; the extended N2 static method; NSP coefficient method; CSM capacity spectrum method

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