THE EXTENSION OF THE N2 METHOD TO ASYMMETRIC BUILDINGS
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THE EXTENSION OF THE N2 METHOD TO ASYMMETRIC BUILDINGS
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THE EXTENSION OF THE N2 METHOD TO ASYMMETRIC BUILDINGS

Author: Peter FAJFAR, Damjan MARUŠIĆ, Iztok PERUŠ | Size: 352 KB | Format: PDF | Publisher: Proceedings of the 4-th European Workshop on the Seismic Behaviour of Irregular and Complex Structures | Year: 2005 | pages: 16

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ABSTRACT
The paper deals with the extension of the N2 method to asymmetric building structures, represented by a 3D structural model. The results of recent parametric studies suggest that in the majority of cases an upper limit for torsional effects can be estimated by a linear dynamic (spectral) analysis. Based on this observation, it is proposed that the results obtained by pushover analysis of a 3D structural model be combined with the results of a linear dynamic (spectral) analysis. The former results control the target displacements and the distribution of deformations along the height of the building, whereas the latter results define the torsional amplifications. In the paper, first the theoretical background of the transformation of a 3D MDOF model to an equivalent SDOF model is given. Then, the proposed extended N2 method is summarized and applied to a test example of an asymmetric three- storey reinforced concrete frame (“SPEAR”) building. The results are compared with results of nonlinear dynamic time-history analyses.

Proceedings of the
4-th European Workshop on the Seismic Behaviour of Irregular and Complex Structures
26-27 August 2005 Thessaloniki, Greece
Paper No. 41

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