Non Linear Analysis of Structures According to New European Design Code

Abstract eng:
Structures designed in seismically active regions must comply with two basic demands: first, structure must be designed for loads during usage (ultimate limit state and serviceability limit state) and second, structure must be sound enough to avoid collapse during earthquake (ultimate limit state). Except from linear-elastic calculations, very often are used non-linear methods. In this article simple plain frame concrete structure will be analyzed using N2 method from Eurocode 8 (EN 1998-1:2004). N2 is simple non-linear method used for calculation of structures during earthquakes. It combines multi degree pushover analysis with spectrum analysis of equivalent single degree of freedom (SDOF) system. It is formulated in acceleration-displacement format, which is very suitable for visual overview of basic variables that account for seismic response of the structure. N2 method can be considered as combination of pushover analysis and spectrum analysis. Inelastic demand spectrum is obtained from elastic spectrum. Results obtained are accurate enough if structure has dominant first mode of oscillation. For now, it is used only for plane structures. This paper will give numerical example of N2 method. It is concluded that inelastic structural response is crucial in earthquake engineering. Modern methods, supported with usage of computers and strict design codes ensure better understanding of structural response during earthquakes and at the same time seismic resistant structures.

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