Third M.I.T. Conference on Computational Fluid and Solid Mechanics June 14–17, 2005  

Cost-benefit analysis of conventional and seismic isolated R/C buildings

E.C. Vassilas, V.K. Koumousis*
School of Civil Engineering, Institute of Structural Analysis & Aseismic Research, National Technical University of Athens, Iroon Politexneiou Str., Zografou, Athens, 15780, Greece

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The main subject of this work is the cost–benefit evaluation of base isolated versus conventional R/C buildings. By applying well established principles of performance-based earthquake resistant design, using fragility curves obtained from bibliographic sources, integrating a probability density function representing the seismic intensity at the site, and performing approximate non-linear structural analysis, a methodology for investigating the life-cycle costs of an actual three-story R/C building is presented. Through this case study, the use of base isolation is demonstrated to be effective in reducing the life-cycle costs. In addition, by investigation of modified structural systems, it is shown that fewer restrictions are imposed on the architectural design of the building.

Keywords:  Performance-based earthquake engineering; Base isolation; Life-cycle costs; Probability density function; Fragility curves; Dynamic analysis; Approximate methods

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