IMPLEMENTATION OF A HYBRID SIMULATION TO INVESTIGATE INELASTIC HIGHER-MODE EFFECTS IN RC STRUCTURAL
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Notice bibliographique
Résumé
Reinforced concrete (RC) structural walls are used as seismic force-resisting systems in most modern mid-rise and high-rise buildings. It has been demonstrated that shear force amplification occurs in yielding RC walls during a strong earthquake due to higher vibration mode effects. This is a major concern for preventing shear failure, which can be addressed by incorporating a shear amplification factor into current codes. Several numerical studies have been performed to predict the amplification factor. The complexity of seismic responses of RC walls in plastic hinge zones has led some to doubt predicted shear force amplification when using such analysis. The substructure hybrid test method provides the opportunity to experimentally evaluate the seismic response of an entire RC wall structure under actual earthquake loads without including large masses typically encountered in multistory buildings. Hybrid tests were conducted on 8-story ductile regular RC walls using advanced controlling methods to investigate shear force amplification due to inelastic higher-mode effects. The studied structure was divided into experimental and numerical subassemblies. The experimental test specimen corresponded to the first story of a model RC wall as a key region of interest, while the remaining wall was modeled numerically using nonlinear beam–column elements. The size of the test specimen was scaled down to accommodate the equipment capacity in the structural laboratory. A series of tests based on short-duration earthquake ground motions typical of eastern Canada seismic hazard regions resulted in higher than code-specified shear amplification factors, but no sudden significant decline in lateral stiffness was recorded. Considering the possibility of a large-magnitude, long-duration earthquake generated by the Cascadia Subduction Zone (CSZ) in western Canada, two numerical modeling methods were used for an inelastic time history analysis of a 10-story RC wall located in Vancouver subjected to ground motions selected from a subduction ground motion database based on the conditional spectrum (CS) method. It was found that a large-magnitude long-duration earthquake could cause several amplified shear cycles, raising concerns about the risk of brittle shear failure. Consequently, further experimental testing is needed considering these results and uncertainties regarding the shear capacity of an RC wall under a high number of cycles with amplified shear demand.
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| 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 |
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