ASSESSMENT OF COLLAPSE SAFETY OF TORSIONAL SENSITIVE STEEL BUILDINGS UNDER BIDIRECTIONAL EXCITATIONS
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Résumé
Post-earthquake investigations showed that torsion-induced damage was among the causes of buildings collapse. In previous studies, researchers observed that accidental torsion could cause yielding of one braced frame, which, in turn, changes the center of rigidity toward the undamaged frame by increasing the inherent eccentricity with respect to the center of mass, CM. To account on these effects and those induced by bidirectional excitation and other sources, accidental torsion caused by accidental eccentricity (ea) was introduced in building codes to increase member sections resisting storey shear. The current Canadian National Building Code (NBC) considers accidental torsion caused by ea = ±10%Dnx, where Dnx is the plan dimension of the building at level x perpendicular to the direction of seismic loading. According with NBC provisions, a building is classified as torsionally sensitive, if the ratio Bx is greater than 1.7. Nonetheless, for regular buildings, the code allows considering ea = ±5%Dnx if dynamic analysis is employed. According to ASCE/SEI 7-16 standard, the torsional moments are computed for ea = ±5%Dnx, but for torsionally sensitive buildings, these are multiplied by a torsional amplification factor Ax. It is worth mentioning that a symmetric building that has relatively low torsional stiffness could be torsionally sensitive. To emphasize on the correlation between the predicted displacements caused by torsional moments induced by ea and those resulted from nonlinear response history analysis, the need for a detailed 3D building model emerged. The objectives of this paper are: i) to quantify the effect of accidental torsion considered in seismic design, by assessing the collapse safety of steel braced frame buildings, using detailed 3D building models, ii) to assess the effect of bidirectional excitation on the nonlinear seismic response of regular and torsionally sensitive buildings, and iii) to evaluate the strength and deflection criteria of torsionally sensitive steel buildings. The case study is a 4-storey concentrically braced frame (CBF) office building with a square floor plan and various CBFs locations leading to various Bx ratios. The distribution of inelastic demand is analysed in terms of interstorey drift, residual drift and floor acceleration, measured at the extreme points of building floor and CM. Considering incremental dynamic analysis, the collapse safety criterion is verified and discussed.
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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 | 0,001 | 0,001 |
| 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) | 0,000 | 0,000 |
Scores machine (provisoires)
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