Characterization of wood sheathed cold-formed steel diaphragms: Under in plane loading (phase 2 of diaphragm research program)
Notice bibliographique
Résumé
There exists a desire to better understand the in-plane response of cold-formed steel (CFS) framed diaphragms subjected to seismic loading. At present, the diaphragm design information available in the North American design standards (AISI S240, AISI S400) is not applicable in Canada and is of limited scope in the United States and Mexico. These design provisions are based largely on basic principles of engineering and the extrapolation of design methods used for wood diaphragms. Few full-scale tests have been performed to validate the accuracy of these design values and equations for real world application. Furthermore, the effect of non-structural components on the in-plane strength and stiffness of the diaphragm component has yet to be explored. In an effort to provide insight into the complex nature of the diaphragm structure and the influence of non-structural components, a research program was initiated in the Jamieson Structures Laboratory at McGill University focusing on the characterization of the behaviour of CFS framed - wood sheathed diaphragms under in-plane loading. A total of six 3.7m x 6.1m CFS diaphragm specimens with oriented strand board sheathing were tested following the cantilever test method. Three of these diaphragms focused on the effects of structural changes, while the remaining three were used to investigate the effects of incorporating non-structural elements in the construction. This thesis contains a detailed account of these six tests, including their design, construction and the overall results and observations. The tests focusing on structural changes, demonstrated that the orientation of the joists with respect to loading had little effect on the overall diaphragm response, strap blocking for panel edges was shown to be just as effective as full blocking and an upper threshold for shear strength and stiffness was reached by reducing the spacing of the perimeter fasteners. The tests of diaphragms built having non-structural elements demonstrated that both the addition of a single layer of gypsum panels to the underside of the diaphragm and a 19mm gypcrete topping poured on top of the wood sheathing had a significant strengthening and stiffening impact on the overall diaphragms response. Design predictions were calculated using the AISI S400 Standard for both deflection and shear strength. Meaningful comparisons were only realized for design deflection when the equation for shear walls was used with the values adjusted to remove inelastic behaviour, while no meaningful comparisons were realized for shear strength due to the limited information available within the S240 and S400 standards.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
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 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| 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 | 0,000 | 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.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».