Evaluation of vertical ground and floor accelerations and spectra in elastic RC frame buildings located in Eastern Canada
Notice bibliographique
Résumé
Whilst significant structural damage to buildings has generally been rare as a result of recent moderate and severe earthquakes, destructive non-structural damage has been much more widespread and can lead to additional economic loss. In most codes and standards, only the effect of the horizontal component has been discussed in relation to seismic design and analysis. The effect of the vertical component has been less considered or completely neglected. However, the effect of vertical seismic acceleration can be more impressive in some cases and severely affect a building’s structural performance and, consequently, its nonstructural components (NSCs). The National Building code of Canada (NBC, 2015) is mainly limited to an empirical ratio of 2/3 in the relationship between vertical and horizontal acceleration. Also, in this code, the requirement to consider the vertical seismic component is limited only to structures with long spans, pre-stressed structures, and structures with highly stressed elements under gravity loads. \n \nIn this project, the characteristic of the vertical component of ground motions for Site Class C in the Eastern Canada seismic region was investigated, and a relation was proposed to establish the vertical design spectral acceleration using the vertical-to-horizontal pseudo-spectral acceleration ratios (V/H PSA) obtained from the selected 248 records of 67 earthquakes of this region with a magnitude Mw ≥ 3.0 and an epicentral distance (Repi) <150 km. Due to the lack of enough records for very dense soil according to the mentioned criteria in this region, records from other soil types than very dense soil and soft rock were converted to the corresponding records on Site Class C using the software DEEPSOIL. The computed V/H PSA ratios were calibrated with those obtained from compatible Ground Motion Prediction Equations (GMPEs). The computed mean V/H PSA ratios exceeded the typical value of 2/3 recommended in NBC 2015, especially for short periods of up to 1.3 sec. A profile of vertical acceleration design spectra (ADSver) was proposed for Site Class C in Montreal and compared with those obtained by ASCE/SEI 7-16 (2017) and ASCE 41-17 (2017) provisions. \n \nIn addition, the effect of building height and the flexibility of the slab on the vertical response of the floor system, including different locations within the floor and along the building height on the amplification of vertical peak floor accelerations and floor spectral accelerations was assessed. To this end, four 3-D elastic regular RC moment-resisting frame buildings with limited ductility for the location on Site Class C of Montreal. Therefore, 3-, 6-, 9- and 12- storey regular RC buildings with moderately ductile moment-resisting frame systems and three spans of 7.0 meters in each direction, designed in accordance with the National Building Code of Canada (NBC 2015), were selected for this research. Moreover, 65 sets of historical records relating to 31 severe earthquakes from across the world as input time history accelerations were used to analyze the linear behavior of these structures. \n \nThe maximum amplification of vertical Peak Floor Acceleration (PFAV) was observed at the center of the buildings’ interior slab, with the maximum median normalized values ranging from 4.0 in the 3-storey building, to 1.24 in the 12-storey building. Moreover, the constant amplification of the vertical Floor Spectral Acceleration (FSAV) was observed along the building height. The significant impact of the vertical component of the earthquake was more visible at shorter periods since the maximum vertical acceleration resulted at periods of less than 0.35 sec. Finally, the estimated FSAV corresponding to the input vertical ground acceleration was proposed for the typical buildings. Therefore, this study indicates that the vertical earthquake motion should not be overlooked in the analysis and design process, especially in low-rise 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.
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 | 0,000 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,002 | 0,003 |
| Études des sciences et des technologies | 0,001 | 0,001 |
| Communication savante | 0,001 | 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 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 ».