Comparison of design codes for seismically isolated structures

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2005

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Acar, Emre

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This study presents information on the design procedure of seismic base isolation systems. Analysis of the seismic responses of isolated structures, which is oriented to give a clear understanding of the effect of base isolation on the nature of the structure; and discussion of various isolator types are involved in this work. Seismic isolation consists essentially of the installation of mechanisms, which decouple the structure, and its contents, from potentially damaging earthquake induced ground motions. This decoupling is achieved by increasing the horizontal flexibility of the system, together with providing appropriate damping. The isolator increases the natural period of the overall structure and hence decreases its acceleration response to earthquake-generated vibrations. This increase in period,together with damping, can reduce the effect of the earthquakes, so that smaller loads and deformations are imposed on the structure and its components. The key references that are used in this study are the related chapters of FEMA and IBC2000 codes for seismic isolated structures. In this work, these codes are used for the design examples of elastomeric bearings. Furthermore, the internal forces develop in the superstructure during a ground motion is determined; and the different approaches defined by the codes towards the ءscaling factor̕ concept is compared in this perspective.

Subject Keywords

Architectural Engineering.

URI

http://etd.lib.metu.edu.tr/upload/12607015/index.pdf
https://hdl.handle.net/11511/15660

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

E. Acar, “Comparison of design codes for seismically isolated structures,” M.S. - Master of Science, Middle East Technical University, 2005.