Testing of extended shear tab and coped beam-to-girder connections subject to shear loading
Notice bibliographique
Résumé
Beam-to-girder steel connections are commonly constructed using either extended shear tabs or coped beams. The American Institute of Steel Construction has outlined a design procedure for coped beams, and as of 2011 also included guidelines for the design of extended shear tabs. On the other hand, Canadian standards do not provide professional engineers with guidelines for the design of coped beams and only address conventional shear tab connections. Therefore, a total of thirteen full-scale tests were performed in order to provide structural engineers with relevant experimental results from which to predict the behaviour of extended shear tabs of different depths and coped beams with varying reinforcements, cope details, and connectors subject to shear loading. Four of the tests were used to investigate two specific limit states: buckling of extended full depth shear tabs and localized deformations in the supporting girder web of partial depth extended shear tabs. It was found that by reducing the slenderness of the shear tab plate, out-of-plane deformations in the plate were reduced but not avoided. In order to more accurately represent the restraints in a building, a pseudo-concrete slab was installed to prevent girder rotation; however, this did not prevent girder web deformation. As a result, a retrofit steel plate was welded, connecting the shear tab and the girder web in order to engage a larger area of the supporting member. Even though the local girder web punching was decreased with this retrofit, the web deformation was not eliminated.In order to gain a better understanding of the behaviour of coped beams, nine full-scale tests were conducted. These specimens were divided into four categories: bolted single coped (coped compression flange), bolted double coped (coped compression and tension flanges), single and double coped welded in-shop, and single coped haunched beams. The bolted configurations were connected to the supporting girder with the use of a stiffener plate welded to the girder flanges and web. Two reinforcement schemes were also investigated; horizontal stiffeners and doubler plates were considered to assess their effectiveness in improving the strength of coped beams. The interaction between shear and flexural forces based on the Von Mises criterion, which is not part of any current design standard, consistently governed the design and could be used to accurately predict the behaviour of coped beam configurations, and as such, is proposed for inclusion in a standard design procedure.
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,002 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,001 |
| Méta-épidémiologie (sens large) | 0,001 | 0,001 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,000 | 0,001 |
| Science ouverte | 0,001 | 0,001 |
| Intégrité de la recherche | 0,001 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,004 | 0,001 |
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 source (Gemma direct ou Codex distillé), 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 ».