Assessing the seismic response of existing RC buildings using the extended N2 method |
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Authors: | C Bhatt R Bento |
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Institution: | (1) Politecnico di Milano, Structural Engineering Department, Milano, Italy;(2) Joint Research Centre, ELSA Laboratory, Via E. Fermi, 1, 21020 Ispra, VA, Italy |
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Abstract: | Extensive studies have confirmed the good performance of the N2 method, recommended by Eurocode8, when performing pushover
analyses in regular structures. However, this procedure shows lack of accuracy in predicting the torsional motion of plan-asymmetric
buildings. In order to overcome this problem, Peter Fajfar and his team have proposed an extension of the method based on
a combination of a pushover analysis and of an elastic response spectrum analysis. Since definitive answers about this topic
have not yet been reached, this paper intends to proceed the study applying the extended N2 method to real existing RC buildings.
Three real plan-asymmetric buildings with three, five and eight storeys were assessed. The results obtained with the extended
N2 method were compared with the ones evaluated by means of the original N2 and with the nonlinear dynamic analysis through
the use of semi-artificial ground motions. The analyses were performed for different seismic intensities in order to evaluate
the torsional response of the building through different stages of structural inelasticity. The results obtained show that
the extended N2 method generally reproduces in a very good fashion the real torsional behavior of the analyzed buildings.
The conclusions herein outlined, added to the ones already published by the aforementioned authors, seem to confirm that the
extended N2 method can be introduced in the next version of Eurocode8 as a nonlinear static procedure capable of accurately
predicting the torsional response of plan-asymmetric buildings. |
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