Earthquake-resistant design procedures for tall guyed telecommunication masts
Notice bibliographique
Résumé
Telecommunication infrastructure is a fundamental component of communication and post-disaster networks and its preservation in the case of a severe earthquake is essential. Telecommunication masts are typically tall structures whose function is to support elevated antennas for radio and television broadcasting, telecommunication, and two-way radio systems. Therefore, immediate serviceability or even continuous function of first-aid-station infrastructure is of critically high priority in the case of a disaster. The current research deals with the dynamic behaviour of tall guyed masts under seismic loads and builds upon the previous research done at McGill University since 1993. Engineering literature of this field reports that the design of tall guyed telecommunication masts is usually governed by serviceability criteria under severe wind conditions, typically combined with icing in cold climates. However, there is a need for seismic design checks of guyed masts constructed in zones with moderate to high seismicity. The nonlinear dynamic behaviour of tall multi-support telecommunication masts is extremely complex. Presently reliable seismic design of telecommunication masts requires nonlinear time domain analysis based on detailed finite element models. Such effort is certainly justified for especially tall and important structures located in active seismic zones. However, it may not be absolutely necessary for many tall structures whose design is likely governed by climatic load effects. The degree of complexity and sophistication of these numerical simulation procedures far exceeds common engineering practice in the trade. There exists a need for simplified procedures for earthquake-resistant design checks of tall guyed telecommunication masts; such procedures are currently available for self-supporting lattice towers but are still lacking for guyed masts.The first step in this research was to study the dynamic properties and characteristics of guy clusters in detail based on rational cable mechanics, with a view to develop a simplified procedure that would yield these properties for guyed telecommunication mast analysis. Detailed numerical simulations and analytical studies involving 57 guy cables from eight existing towers with varying heights of 150 to 607 m were used in this section. A mathematical frequency domain procedure was further developed to replace the nonlinear time-variant cable stiffness with an equivalent linear frequency-dependent spring/mass system, based on the response spectrum of individual guy cables and the frequency content of the input seismic excitation. The effects of substituting guy cable clusters with their equivalent linearized springs on the tower structural characteristics and their interaction with the mast stiffness were studied next. Finally, a condensed model of the guyed mast was created where the individual horizontal stiffness elements were evaluated at each cluster level and the structures' mass/stiffness matrices were developed to perform seismic analysis. The proposed procedure has been tested with nine case studies of real telecommunication masts subjected to five different seismic inputs. Another mast has been added to the first eight considered since in situ measurements of natural frequencies and cable tensions are planned on this structure in the near future.In order to further validate the proposed method, two selected telecommunication masts were studied under the effects eighty-one recorded Californian earthquakes. It is to be noted that the research was originally motivated by the need to provide sound scientific background for approximate seismic design procedures of tall masts in a future revised edition of the Canadian Standards CAN/CSA-S37-01: Antennas, Towers and Antenna-Supporting Structures. Appendix M of this document is dedicated to earthquake-resistant design procedures and does not provide any guidance for approximate analysis methods for guyed masts.
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,001 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,001 | 0,000 |
| Communication savante | 0,000 | 0,001 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,001 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
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