Notice bibliographique
Résumé
Coupled shear wall structures are recognised as one of the most efficient lateral load resisting systems. To achieve a desirable performance for such a system, coupling beams connecting to the shear walls are usually subjected to a high shear stress, and are designed with a short span and relatively deep depth. However, the shear limitation of concrete and the brittle behaviour of normal reinforced coupling beams, when subjected to seismic load, are the key drivers in seeking new practical solutions, which can increase the shear strength and the seismic capacity of coupling beams. Encasing a vertical steel plate as shear reinforcement into the traditional reinforced concrete coupling beam is therefore considered as an effective way to improve the seismic performance and enhance the shear strength. In this thesis, an experimental programme and analytical model development on the shear capacity of steel-plate encased concrete coupling beams are presented. An experimental investigation is first conducted to study the shear strength and structural performance of steel-plate encased concrete coupling beams under both monotonic and reversed-cyclic loads. In the test programme, a new test rig was designed and constructed, with a unique rail and conveyor belt system, to simulate the coupling beam action under lateral load and, at the same time, to accommodate specimens with different span lengths in a rapid and easy manner. A total of eleven large-scale coupling beam specimens were fabricated, in which nine were constructed with encased steel plates while the other two were conventionally reinforced designed as control specimens. Within the eleven test specimens, four were monotonically loaded while the rests were reversed cyclically loaded. The influences of steel plate ratio, stirrup ratio and span-to-effective depth ratio on the composite coupling beams are discussed. The test results show that the shear strengths attained by all the steel-plate encased concrete coupling beam specimens are much greater than the shear stress limits given in the current codes of practice. In addition, the energy dissipation capacity of the concrete coupling beam can be greatly enhanced by the encased steel plates. The encouraging test results reveal the feasibility of using the steel-plate encased concrete coupling beams in general practice. A comprehensive database of the test results of steel-plate encased concrete coupling beams is first established herein. The database includes the available experimental data of 41 reinforced concrete coupling beams embedded with vertical steel plates tested by the author and other researchers. The available data in the database was then used to evaluate the effectiveness and accuracy of the common design provisions in Japan, Mainland China, Hong Kong, the United Kingdom, Europe, Canada and the United States, on the strength prediction of the steel-plate encased concrete coupling beams. A comparison showed that the shear contributions from all components, including the steel plate, stirrups and reinforced concrete, should be considered in determining the shear capacity of the composite coupling beams. Among the ten different design approaches, EC4 (2004), JGJ138 (2001) and YB9082 (2006) give better strength prediction with the mean and COV of the strength ratios about 1.03 and 25% respectively. An analytical model known as Modified Softened Strut-and-tie Model is proposed to predict the shear strength of reinforced concrete coupling beams with encased vertical steel plates. The proposed model is derived mainly based on the softened strut-and-tie model and strip model. The shear resistance of the composite beam is contributed by two shear resisting mechanisms, which are diagonal and vertical ones. The shear strengths predicted by the proposed model show good agreement with the available experimental data. The proposed method provides a rational and effective means for predicting the shear strength of the steel-plate encased concrete coupling beams.
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 | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| 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) | 0,001 | 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 ».