000013275 001__ 13275
000013275 005__ 20161114160334.0
000013275 04107 $$aeng
000013275 046__ $$k2009-06-22
000013275 100__ $$aMpampatsikos, V.
000013275 24500 $$aEurocode 8: comparison of different methods of analysis for the assessment of existing r.c. frame buildings

000013275 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013275 260__ $$bNational Technical University of Athens, 2009
000013275 506__ $$arestricted
000013275 520__ $$2eng$$aThe assessment of the seismic response of existing structures built according to out-of-date or even non-seismic codes is in general difficult, since the lack of considerations of the nonlinear response in the design stage leads to relevant uncertainties about location, extension and ductility capacity of nonlinear mechanisms. The main consequence is the strong gain in complexity of the assessment procedures proposed in the present codes, which promote the use of nonlinear methods of analysis to compute the seismic demand. In particular, according to Eurocode 8, the possibility of performing linear analyses is subordinated to strict conditions of applicability (rarely satisfied), while the use of the nonlinear static analysis based on 2-D conventional pushover is recommended. In this study, four existing r.c. frame buildings, built according to out-of-date codes and characterized by different structural configurations, are analyzed with linear dynamic, nonlinear static and nonlinear dynamic analyses, performed on the base of the recommendations of Eurocode 8. The obtained results are then compared to each other with the following aims: i) checking if the applicability conditions of linear methods are appropriate, or too severe, in particular when the purpose of the analysis is to get only general indications about the need of retrofitting; ii) giving a judgment about the reliability of the results obtained performing the nonlinear static analysis based on conventional 2-D pushover, particularly for configurations characterized by torsional effects; iii) identifying, for the considered structures, the most appropriate method of analysis among those proposed in Eurocode 8, in terms of both accuracy of the results and required computational efforts.

000013275 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013275 653__ $$ar.c. frame building assessment, Eurocode 8-3, effective stiffness in linear analyses, applicability conditions of linear methods, reliability of conventional nonlinear static analysis. Abstract. The assessment of the seismic response of existing structures built according to out-of-date or even non-seismic codes is in general difficult, since the lack of considerations of the nonlinear response in the design stage leads to relevant uncertainties about location, extension and ductility capacity of nonlinear mechanisms. The main consequence is the strong gain in complexity of the assessment procedures proposed in the present codes, which promote the use of nonlinear methods of analysis to compute the seismic demand. In particular, according to Eurocode 8, the possibility of performing linear analyses is subordinated to strict conditions of applicability (rarely satisfied), while the use of the nonlinear static analysis based on 2-D conventional pushover is recommended. In this study, four existing r.c. frame buildings, built according to out-of-date codes and characterized by different structural configurations, are analyzed with linear dynamic, nonlinear static and nonlinear dynamic analyses, performed on the base of the recommendations of Eurocode 8. The obtained results are then compared to each other with the following aims: i) checking if the applicability conditions of linear methods are appropriate, or too severe, in particular when the purpose of the analysis is to get only general indications about the need of retrofitting; ii) giving a judgment about the reliability of the results obtained performing the nonlinear static analysis based on conventional 2-D pushover, particularly for configurations characterized by torsional effects; iii) identifying, for the considered structures, the most appropriate method of analysis among those proposed in Eurocode 8, in terms of both accuracy of the results and required computational efforts.

000013275 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013275 720__ $$aMpampatsikos, V.$$iNascimbene, R.$$iPetrini, L.
000013275 8560_ $$ffischerc@itam.cas.cz
000013275 8564_ $$s302438$$uhttps://invenio.itam.cas.cz/record/13275/files/CD412.pdf$$yOriginal version of the author's contribution as presented on CD, section: Seismic design methods.
000013275 962__ $$r13074
000013275 980__ $$aPAPER