| Titre : | Seismic response spectra for probabilistic analysis of nonlinear systems (2012) |
| Auteurs : | Praveen K. Malhotra, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Journal of structural engineering (Vol. 137 N° 11, Novembre 2011) |
| Article en page(s) : | pp. 1272-1281 |
| Note générale : | Génie Civil |
| Langues : | Anglais |
| Tags : | Earthquake loads Nonlinear analysis Probabilistic methods Seismic design Ground motion Correlation Structural |
| Résumé : | In the conventional seismic analysis of a system, the input motion is defined either by a probabilistic response spectrum or by ground-motion histories whose spectra “match” the probabilistic response spectrum. In both cases, it is implicitly assumed that the spectral values at different periods on a probabilistic response spectrum are fully correlated with one another. A nonlinear system changes its “effective” period during seismic shaking; hence, its response depends on spectral values at many natural periods. The assumption of complete correlation between spectral values at different periods results in an overestimation of the response of a nonlinear system. For the case analyzed in this paper, the conventional use of a 500-year mean return period (MRP) response spectrum in nonlinear analysis produces responses that have 20–30% longer MRPs. Also, the larger-component response acceleration was 11% higher than the geometric-mean response acceleration, and the larger component response deformation was 33% higher than the geometric-mean response deformation. This paper presents a more accurate way of using the response spectrum in the probabilistic analysis of nonlinear systems. |
| DEWEY : | 624.17 |
| ISSN : | 0733-9445 |
| En ligne : | http://ascelibrary.org/sto/resource/1/jsendh/v137/i11/p1272_s1?isAuthorized=no |
