Analysis, design, and strengthening of communication towers
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Notice bibliographique
Résumé
This dissertation discusses several topics relating to the analysis, design, and strengthening of self-supporting and guyed communication towers, some of which are not covered by Canadian Standard CSA S37-01 and American Standard ANSI/TIA/EIA-222-G. The effect of sudden guy rupture and guy slippage on guyed towers, effect of eccentricity on the tensile strength of bolted ring-type splice connections, calculation of prying action on bolted circular splice connections, and strengthening of solid round leg members with split pipes were studied.\nExperimental investigation was conducted on small-scale guyed tower test specimens, bolted ring-type and circular splice connections, and solid round steel members strengthened with split pipes. Finite element analysis models of small-scale guyed towers and solid round test specimens were built to simulate the experimental investigation.\nBased on experimental investigation, it was found that the maximum load amplification factors due to sudden guy wire rupture with an initial tension of 10% of the guy wire breaking strength ranged from 1.45 to 2.21, and those with doubled initial tension decreased to a range of 1.43 to 1.96. For guy slippage, it was found that those factors ranged from 1.10 to 1.56. The maximum load amplification factors are highest when rupture or slippage happened at top level guy wires. The finite element models can be used to determine the maximum load amplification factors due to sudden guy rupture and guy slippage on tower test specimens.\nOn the basis of the research, it was concluded that bolted ring-type splices should be designed for combined stresses due to axial tension and bending moment. The equations for prying action given in the Canadian Institute of Steel Construction Handbook and American Institute of Steel Construction Manual can be used in circular flange connections, with the bolt pitch taken as the distance between the centres of bolts measured along the bolt circle.\nIt is recommended that split pipes be used along the entire solid round steel member and be connected with end welds in addition to U-bolts/tabs. For stocky members, stitch welds are preferable since there is a minimal strength increase by using U-bolts/tabs only. The finite element models can be used to determine the failure loads of un-strengthened and strengthened solid round steel test specimens.
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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 | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| 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 découle