Seismic Performance of Concentrically Braced Steel Frames of the Conventional Construction Category
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Bibliographic record
Abstract
RESUME Le principal objectif de ce projet de recherche etait d’examiner la performance sismique de bâtiments de type de construction conventionnelle (CC Type). Ce principal objectif a ete atteint avec les objectifs plus precis suivants : -Evaluer la capacite en deformation des connexions couramment utilisees dans ces structures; et -Reevaluer la pertinence de la limite de 15 m de hauteur imposee sur ces structures dans le code national du bâtiment (CNB). Cette limite a aussi ete etudiee pour voir si elle pouvait etre nuancee en fonction de certains parametres, comme le type d’assemblages utilise, la localisation au Canada (est versus ouest), le type de sol (C versus E) et le nombre d’etages, entre autres. Des tests au laboratoire ont ete effectues en deux phases experimentales sur des assemblages typiques de diagonales de contreventement. Pour les deux phases, les specimens consistaient de deux cornieres dos-a-dos boulonnees a une plaque de gousset. Cette configuration est representative d’une connexion couramment utilisee en pratique pour des contreventements. La premiere phase experimentale avait pour but d’evaluer la ductilite de cinq differents modes de rupture dans une connexion : rupture de soudures paralleles a l’effort, rupture sous pression diametrale de boulons, rupture sur l’aire nette des cornieres, rupture en cisaillement des boulons et le dechirement des cornieres en traction et en cisaillement. Tous les specimens ont ete testes sous une charge monotonique en traction. Il a ete determine que les ruptures sous pressions diametrales de boulons offraient le meilleur potentiel comme connexions ductiles dans un bâtiment de type de construction conventionnelle. La deuxieme phase experimentale avait pour but de maximiser la capacite en ductilite, ou deformation, d’un assemblage subissant une rupture sous pression diametrale des boulons contre le gousset d’assemblage. ----------ABSTRACT The main objective of this research project was to study the seismic behaviour of regular conventional construction (CC Type) concentrically braced steel frames (CBFs). More specifically, this objective was achieved through the following objectives: -Evaluate the deformation capacity of typical brace connections used in these structures; and -Evaluate the suitability of the 15 m height limit imposed by the 2005 NBCC. This limit should also be studied to determine whether it can be made a function of several building parameters, such as the type of connections used (ductile versus non-ductile), the building location (eastern versus western Canada), the site class (C versus E), and the number of storeys, among others. Two experimental phases were carried out in order to assess the ductility capacity of typical vertical bracing connections. For both phases, the specimens consisted of back-to-back angles bolted to a gusset plate. This configuration is representative of typical connections used in practice. The first phase consisted of testing five different connection failure modes: failure of welds parallel to loads, bolt bearing failure on the gusset plate, net area rupture of the angles, bolt shear rupture, and shear and tension block failure of the angles. All specimens were tested under monotonic tensile loadings. It was found that bolt bearing failures offered the best potential for being used as a ductile connection failure mode in CC Type buildings. The second phase consisted of performing further tests on bolt bearing failures in order to optimize their deformation capacities. Different connection parameters were studied: bolt end distance and bolt spacing, and types of holes (drilled and punched holes, standard and short-slotted holes). All specimens used 8 mm thick gusset plates, except for one sub-group of specimens where 13 mm plates were used to ensure bearing failures can take place in thicker plates.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it