Steel shear tab connections subjected to combined shear and axial forces
Notice bibliographique
Résumé
A common approach to connect steel beams to columns is to use single plate shear tabs. Numerous laboratory test programs of these connections subjected to vertical loading alone have been completed over the past 30 years. However, the effect of axial forces on the shear tab's performance has only recently been the subject of study. The presence of an axial force in the shear tab connection will typically result in the need for multiple vertical rows of bolts, which is not addressed in any Canadian design guide. The main objective of the research program described herein was to develop a design approach that could be used by the engineering community to address the effect of combined axial and shear force on a shear tab connection.A series of four full-scale tests were performed on shear tab connections between a W610x140 beam and a W360 x 196 column, as well as a W310 x 60 beam and a W360 x 196 column. The shear tab, which was configured as a double bolt row connection, was subjected to a combined vertical (shear) force and axial tension along with the anticipated rotation of a typical beam-to-column joint. A matching specimen was then tested under shear and axial compression. The results from these tests and previous shear tabs tested under gravity load alone were used in the development of a finite element model that is capable of simulating the response of the connection under shear load; predict the ultimate resistance and the progression of failure. Previous finite element modelling of shear tabs lacked damage simulation capability, did not include the effect of weld tearing, and as such often overestimated the connection resistance. The models presented in this thesis featured special modelling techniques and were able to predict all types of failure modes such as bearing, net area fracture, shear yielding, flexural yielding, and weld tearing of the connections.The FE models were then used to investigate the performance of shear tabs subjected to combined shear and axial force. Shear forceâaxial force interaction curves were generated for various levels of axial tension and compression force for twelve connections. A design approach was proposed which allows practicing engineers to include the effect of any axial force level in the design of a shear tab connection.
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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 | 0,001 |
| 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.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».