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Copyright of Canadian Journal of Civil Engineering is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Civil Engineering is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Presents a study that examined the effect of foundation rocking on the seismic response of shear walls. Background on the provisions of the 1995 National Building Code of Canada regarding foundations; Application of an analysis model to represent a shear-wall structure; Results and implications.

Presents a study that investigated seismic design using the equivalent static load method. Background on approaches in determining seismic load forces; Analysis of the effects of higher modes on base shear; Results and implications for the proposed 2005 edition of the National Building Code of Canada.

Discusses changes in the provisions of the proposed 2005 edition of the National Building Code of Canada regarding seismic loading and design. Seismic hazards in spectral format; Probability of exceedance; Calculation of fundamental periods; Treatment of irregularities; Dynamic analysis requirements.

Copyright of Canadian Journal of Civil Engineering is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Civil Engineering is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Civil Engineering is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Civil Engineering is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Civil Engineering is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The seismic response of tubular steel wind turbine towers is of significant concern as they are increasingly being installed in seismic areas and design codes do not clearly address this aspect of design. The seismic hazard is hence assessed for the Canadian seismic environment using implicit finite element analysis and incremental dynamic analysis of a 1.65 MW wind turbine tower. Its behaviour under seismic excitation is evaluated, damage states are defined, and a framework is developed for determining the probability of damage of the tower at varying seismic hazard levels. Results of the implementation of this framework in two Canadian locations are presented herein, where the risk was found to be low for the seismic hazard level prescribed for buildings. However, the design of wind turbine towers is subject to change, and the design spectrum is highly uncertain. Thus, a methodology is outlined to thoroughly investigate the probability of reaching predetermined damage states under any seismic loading conditions for future considerations. La réponse sismique des tours d'éoliennes en tubes d'acier est une question importante puisque ces dernières sont de plus en plus installées dans zones sismiques et que les codes de calculs ne traitent pas clairement de cet aspect de la conception. Les aléas sismiques sont ainsi évalués pour l'environnement sismique canadien en utilisant une analyse implicite par éléments finis et une analyse dynamique incrémentielle pour une tour d'éolienne de 1,65 MW. Son comportement sous une excitation sismique est évalué, les dommages sont définis et un cadre est établi pour déterminer la probabilité de dommages à la tour à différents niveaux d'aléas sismiques. Les résultats de l'implantation de ce cadre en deux endroits au Canada sont présentés, où le risque était faible pour le niveau d'aléas sismiques prescrit pour les bâtiments. Toutefois, la conception des tours d'éoliennes est sujette à changement et la plage de conception est très incertaine. Ainsi, une méthode est présentée afin d'examiner en détail la probabilité d'atteindre des niveaux de dommages prédéterminés sous des conditions de charge sismique possibles dans l'avenir. [ABSTRACT FROM AUTHOR]

Examines dynamic analysis procedures for the computation of seismic design forces. Categories of dynamic analysis procedures; Information on the seismic provisions of the 1995 National Building Code of Canada; Details of the determination of the structural period to be used in association with the equivalent static force method.

Presents a study that examined foundation factors in seismic codes to capture the amplification effects of local soil conditions on ground motions. Review of developments in categorizing site conditions for seismic codes; Analysis of approaches to foundation factors; Implications of the results for the proposed 2005 edition of the National Building Code of Canada.

Presents a study that examined the provisions of the 1995 National Building Code of Canada (NBCC) with regard to the elastic response of simple asymmetric building models to earthquake motions. Background on the torsion provisions of the 1995 NBCC; Analysis of the torsional response of the single-story building model; Results and implications.

Examines proposed changes to the 2005 edition of the National Building Code of Canada regarding seismic force modification factors. Background on developments in the base shear equation for seismic design; Analysis of several approaches in determining force modification factors; Results and implications.

Provides information on the provisions of the proposed 2005 edition of the National Building Code of Canada regarding earthquake-resistant design. Requirements for complete load paths; Definitions of irregular structures and special design requirements associated with the irregularities; Importance of the effects of displacements.

Focuses on the development of a seismic hazard model by the Geological Survey of Canada to update the seismic hazard maps of the country. History of seismic hazard maps; Technological changes in seismic hazard analysis; Information on the provisions of the proposed 2005 edition of the National Building Code of Canada.