Effect of flanged walls on the seismic performance of tall buildings

✍ Scribed by Ekwueme, Chukwuma G. ;Srinivasan, Mukund ;Hart, Gary C.

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 316 KB
• Volume: 6
• Category: Article
• ISSN: 1062-8002
• DOI: 10.1002/(sici)1099-1794(199712)6:4<263::aid-tal101>3.0.co;2-2

✦ Synopsis

Flanged walls are a common feature in concrete and masonry construction that require special consideration because of the distinct nature of their response to earthquake forces. Flanged walls typically have different strength, stiffness and ductility capacities in the two opposite directions when loading is parallel to the web. Their effect on seismic response is particularly critical in tall buildings because the height of the walls usually ensures that the ¯anges are fully effective under lateral loads. An existing building is used to investigate the effect of ¯anged walls on building response. A performance-based approach with three levels of ground motion is used, and nonlinear time history analyses are utilized to determine the structural and non-structural damage for each level of ground shaking. Structural damage is determined with limit state methodology while non-structural damage is evaluated by correlating inter-story drifts and ¯oor accelerations to damage in the non-structural building components. The analyses show that buildings with ¯anged walls will incur less structural damage from moderate earthquakes than corresponding buildings without ¯anged walls. On the other hand, major earthquakes that impose large ductility demands may cause signi®cantly more structural damage in ¯anged walls. Nonstructural damage in ¯anged-wall buildings is about 20±40% greater than that in buildings without ¯anged walls. The increase in non-structural damage is also greater when there are large ductility demands.