Forces induced in multi-storey framed concrete structures due to differential settlement of foundation elements
Notice bibliographique
Résumé
A review of the international codes, including the National Building Code of Canada (NBCC), the American Association of State Highway and Transportation Officials (AASHTO) and the American Concrete Institute (ACI), indicates that these codes do not corporate the forces induced in the super-structural elements due to differential settlement of foundation elements in the design of multi-story structures. In fact the current design procedure, stipulates that foundation and superstructure are designed separately; furthermore, individual foundation elements may settle up to a total of one inch and 0.75 inch in differential settlement between the elements. It is then assumed that the adopted factor of safety for the superstructure will compensate for these additional stresses. This procedure may leads to a conservative design in some cases or serious cracks and damage. This thesis presents a two-dimensional analytical model for multi-story structures subjected to differential settlement of the foundation elements. The objective of this research is create a dialogue between the superstructure and its foundation during the design stage, to allow designer to tradeoff between the additional stresses due to the differential settlements and the factor of safety of the superstructure. The results will leads to the choice of an allowable differential settlement and appropriate factor of safety of the superstructure, which will produce the most economical design for the building, without jeopardizing its safety. In this study, 7 and 10-storey structures were analyzed using linear and non-linear techniques, (geometric and material nonlinearity). In this investigation, the computer program STAAD and ADINA were used to perform this analysis. The rigidity of the structure was represented by the relative slenderness ratio between beams and columns. Empirical formulae were developed and validated with the available analytical models to predict the stresses induced on the elements of the superstructure due to differential settlement of its foundation. These formulae will assist designers to include differential settlement as external load on its superstructure and further to perform a tradeoff between the superstructure and substructure to achieve the most economical design for the building. Detailed design examples were presented to demonstrate the proposed design procedure. The results of the present study will impact on the safety and economy of our building. It should be noted herein that the differential settlements take place at the working load level, and accordingly, they are relatively small. Thus the only difference between linear and non-linear stress-strain (moment curvature) relationship is that the second accounts for the first crack which is insignificant. It is hoped that the results and conclusions of this thesis to be incorporated in the current design codes for multi-story buildings.
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.
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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) | 0,001 | 0,000 |
| Bibliométrie | 0,002 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| 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 ».