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- W4280523740 abstract "Abstract Previous computational studies of short‐period buildings have shown increasing collapse probabilities with decreasing building period; a trend that has not been observed in past earthquakes. In this study, collapse performances of twelve short‐period steel special concentrically braced frame (SCBF) building archetypes were examined using dynamic analysis and the methods described in FEMA P‐695 to investigate this gap between analytically predicted and historically observed collapse rates. The archetypes varied key design and modeling parameters that could influence the behavior. These parameters included number of stories, level of design seismicity, redundancy, the inclusion of soil‐structure interaction (SSI) and foundation flexibility, and the removal of reserve moment frame resistance in modeling. Practicing engineers designed the archetypes resulting in realistic designs, including overstrength values representative of this building type. The calculated overstrength values were much higher than those found in previous studies, largely a result of the archetype building layouts, brace width‐to‐thickness ratio limitations, and the large differences between tension and compressive brace strength that occur when design demands are low. The higher overstrength values found in this study resulted in lower probabilities of collapse, relative to previous collapse studies and showed that probabilities of collapse decreased with decreasing period. Additionally, the probability of collapse increased significantly for the nonredundant archetype, but changed insignificantly for the archetype without reserve moment frame capacity. Inclusion of SSI and foundation flexibility resulted in a complete change in behavior where braces remained elastic and the braced frames rocked on their foundations, resulting in decreased collapse probabilities." @default.
- W4280523740 created "2022-05-22" @default.
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- W4280523740 date "2022-05-20" @default.
- W4280523740 modified "2023-10-18" @default.
- W4280523740 title "Factors affecting the seismic collapse performance of realistic low‐rise braced frame buildings, including soil structure interaction and foundation flexibility" @default.
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- W4280523740 doi "https://doi.org/10.1002/eqe.3666" @default.
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