Pounding between base-isolated and fixed-base RC buildings during earthquakes

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Pounding between base-isolated and fixed-base RC buildings during earthquakes

Author: Deepak Raj Pant, Anil C. Wijeyewickrema Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Japan | Size: 438 KB | Format: PDF | Quality: Unspecified | Publisher: Proceedings of the 8th International Conference on Structural Dynamics, EURODYN 2011 Leuven, Belgium, 4-6 July 2011 G. De Roeck, G. Degrande, G. Lombaert, G. M¨uller (eds.) | Year: 2011 | pages: 07 | ISBN: 978-90-760-1931-4

Pounding of base-isolated buildings during earthquakes could have detrimental effects on the performance of such buildings. Most previous studies on seismic pounding of base-isolated buildings have been carried out using simplified lumped mass numerical models. However, these simplified models cannot incorporate the nonlinear properties of realistic building materials such as reinforced concrete (RC). Therefore, the response of a base-isolated RC building during pounding with an adjacent structure is not well understood. Owing to the increasing use of base-isolation technology for seismic protection of mid-rise RC buildings around the world, it is important to study seismic pounding response of such buildings. This paperinvestigates the seismic pounding of a typical 4-story base-isolated RC building with 4-story and 8-story fixed-base RC buildings. Three-dimensional numerical models with due consideration of material and geometric nonlinearities are developed. Performance of the base-isolated building is evaluated in terms of story drift, story shear and overall damage index. It is foundthat the pounding of the base-isolated building with the 4-story fixed-base building is more critical than the pounding with the 8- story fixed-base building. The findings of the study are expected to assist design and evaluation of typical mid-rise baseisolated RC buildings.

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