10 results
Search Results
2. An evolutionary optimization method to determine optimum degree of activity accelerating and overlapping in schedule compression.
- Author
-
Hazini, Kamran, Dehghan, Reza, and Ruwanpura, Janaka
- Subjects
CONSTRUCTION project management ,COST effectiveness ,GENETIC algorithms ,CIVIL engineering ,TIME management ,SCHEDULING - Abstract
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.)
- Published
- 2014
- Full Text
- View/download PDF
3. A heuristic method to determine optimum degree of activity accelerating and overlapping in schedule compression.
- Author
-
Hazini, Kamran, Dehghan, Reza, and Ruwanpura, Janaka
- Subjects
HEURISTIC ,CIVIL engineering ,MATHEMATICAL models ,SCHEDULING ,OPERATIONS research ,CONSTRUCTION project management ,METHODOLOGY - Abstract
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.)
- Published
- 2013
- Full Text
- View/download PDF
4. A simplified method for seismic analysis of rooftop telecommunication towers.
- Author
-
Assi, Rola and McClure, Ghyslaine
- Subjects
TELECOMMUNICATION ,TELECOMMUNICATION equipment ,TOWERS ,BUILDINGS ,ROOFTOP construction ,TECHNOLOGY - Abstract
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.)
- Published
- 2007
- Full Text
- View/download PDF
5. A comparison of two regional seismic damage estimation methodologies.
- Author
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Onur, Tuna, Ventura, Carlos E., and Finn, W. D. Liam
- Subjects
EARTHQUAKE damage ,EARTHQUAKE intensity ,ESTIMATION theory ,EARTHQUAKE engineering - Abstract
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.)
- Published
- 2006
- Full Text
- View/download PDF
6. Dynamic performance of the Confederation Bridge due to traffic and wind.
- Author
-
Naumoski, Nove, Cheung, Moe S., and Foo, Simon
- Subjects
BRIDGES ,STRAINS & stresses (Mechanics) ,ACCELERATION (Mechanics) ,VIBRATION (Mechanics) - Abstract
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.)
- Published
- 2004
- Full Text
- View/download PDF
7. Traffic and speed characteristics on two-lane highways: field study.
- Author
-
Hassan, Yasser
- Subjects
AUTOMOBILE speed ,TRAFFIC flow ,ROAD construction ,HIGHWAY engineering ,ACCELERATION (Mechanics) - Abstract
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.)
- Published
- 2003
- Full Text
- View/download PDF
8. Simple iteration method for structural static reanalysis.
- Author
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Haifeng Liu, Baisheng Wu, and Zhengguang Li
- Subjects
STRUCTURAL analysis (Engineering) ,ITERATIVE methods (Mathematics) ,STATICS ,RELAXATION phenomena ,ACCELERATION (Mechanics) ,FINITE element method ,COMPUTER simulation ,CIVIL engineering - Abstract
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.)
- Published
- 2009
- Full Text
- View/download PDF
9. Serviceability design factors for wind-sensitive structures.
- Author
-
Pozos-Estrada, A., Hong, H. P., and Galsworthy, J. K.
- Subjects
BUILDINGS ,SENSITIVITY analysis ,STANDARD deviations ,STRUCTURAL dynamics ,FREQUENCIES of oscillating systems ,DAMPING (Mechanics) ,WINDS ,ACCELERATION (Mechanics) - Abstract
Wind-sensitive buildings can experience excessive vibrations that cause discomfort and interruption of the activities of the inhabitants of the buildings. To ensure the desired serviceability, codes, standards, and their commentaries have proposed perception curves that limit the expected (or mean) peak acceleration or standard deviation of the acceleration of the buildings. These perception curves are developed based on perceived vibration alone and do not consider the uncertainty in structural dynamic characteristics (i.e., natural frequency of vibration and ratio of damping) and loads such as the wind loading. Therefore, the annual probability that the perception curve is not exceeded for a building whose design is based on the perception curve is unknown. In this study, serviceability design factors are calibrated for selected targeted annual probability of perception levels by considering the uncertainty in the structural dynamic characteristics, wind characteristics, as well as in the human perception of motion. These serviceability design factors are to be used with the estimated mean peak acceleration caused by along-wind and cross-wind excitations given in the commentaries of the current National building code of Canada. The use of calibrated serviceability design factors for design checking is illustrated with a numerical example. Les immeubles sensibles au vent peuvent connaître des vibrations excessives causant un inconfort et l’interruption des activités des usagers des immeubles. Afin d’en assurer la fonctionnalité, les codes, les normes et leurs commentaires présentent des courbes de perception qui limitent l’accélération crête (ou moyenne) prévue et l’écart type de l’accélération des immeubles. Ces courbes de perception sont développées en se basant sur la vibration perçue uniquement et ne tiennent pas compte de l’incertitude des caractéristiques dynamiques structurales (p.ex. fréquence naturelle de la vibration et le rapport d’amortissement) et des charges telles que la charge due au vent. La probabilité annuelle que la courbe de perception ne soit pas dépassée pour un immeuble conçu selon la courbe de perception est donc inconnue. Dans la présente étude, les facteurs de conception de fonctionnalité sont étalonnés selon une probabilité annuelle cible choisie de niveaux de perception en tenant compte de l’incertitude des caractéristiques dynamiques structurales, des caractéristiques du vent ainsi que de la perception humaine du mouvement. Ces facteurs de conception en fonctionnalité doivent être utilisés avec l’accélération crête moyenne estimée causée par le vent parallèle et latéral contenue dans les commentaires au Code national du bâtiment du Canada en vigueur. L’utilisation de facteurs étalonnés de conception en fonctionnalité pour vérifier la conception est illustrée au moyen d’un exemple numérique. [ABSTRACT FROM AUTHOR]
- Published
- 2010
- Full Text
- View/download PDF
10. Dynamic characteristics of the Confederation Bridge.
- Author
-
Naumoski, Nove, Cheung, Moe S, and Foo, Simon
- Subjects
CONFEDERATION Bridge (N.B. & P.E.I.) ,BRIDGES ,TRANSPORTATION - Abstract
Dynamic characteristics of the Confederation Bridge were determined from recorded accelerograms of vibrations due to traffic and wind. Natural frequencies of four vertical and five transverse modes of the bridge were identified from the Fourier amplitude spectra of the accelerograms. By appropriate filtering and processing of the accelerograms, displacement time histories of vibrations associated with each of these modes were computed, which were used to determine the mode shapes of the bridge. These characteristics are essential for investigations of the dynamic performance of the bridge. The computed natural frequencies are significantly larger than those of the finite element model used in the design of the bridge. Since the dynamic effects due to traffic, wind, and seismic loads depend on the natural frequencies of the bridge, an evaluation study of these effects is needed using the natural frequencies and mode shapes obtained from measured vibrations.Key words: bridge, acceleration, displacement, record, vibration, filtering, frequency, mode, Fourier spectrum.Les caractéristiques dynamiques du pont de la Confédération ont été déterminées à partir d'enregistrements d'accélérations causées par les vibrations dues à la circulation et au vent. Les fréquences fondamentales de quatre modes verticaux et de cinq modes latéraux du pont ont été identifiées à partir de l'amplitude des spectres de Fourier des accélérations enregistrées. Avec un filtrage et un traitement appropriés des accélérations enregistrées, les historiques de temps des déplacements des vibrations associés à chaque mode ont été calculés, lesquels ont été utilisés afin de déterminer les modes propres du pont. Ces caractéristiques sont essentielles afin d'investiguer les performances dynamiques du pont. Les fréquences fondamentales calculées sont significativement plus grandes que celles du modèle d'éléments finis utilisé pour la conception du pont. Puisque les effets dynamiques causés par la circulation, le vent et les charges sismiques dépendent des fréquences fondamentales du pont, une évaluation de ces effets, utilisant les fréquences fondamentales et les modes propres obtenus à partir de vibrations mesurées, est requise.Mots clés : pont, accélération, déplacement, enregistrement, vibration, filtrage, fréquence, mode, spectre de Fourier.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2002
- Full Text
- View/download PDF
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