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Smart Structures and Systems Volume 2, Number 4, October 2006 , pages 339-355 DOI: https://doi.org/10.12989/sss.2006.2.4.339 |
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Retrofit of a hospital through strength reduction and enhanced damping |
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Stefania Viti, Gian Paolo Cimellaro and Andrei M. Reinhorn
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| Abstract | ||
| A procedure to retrofit existing essential facilities subjected to seismic excitation is proposed. The main features of this procedure are to reduce maximum acceleration and associated forces in buildings subjected to seismic excitation by reducing their strength (weakening). The weakening retrofit, which is an opposite strategy to strengthening, is particularly suitable for buildings having overstressed components and foundation supports or having weak brittle components. However, by weakening the structure large deformations are expected. Supplemental damping devices however can control the deformations within desirable limits. The structure retrofitted with this strategy will have, therefore, a reduction in the acceleration response and a reduction in the deformations, depending on the amount of additional damping introduced in the structure. An illustration of the above strategy is presented here through an evaluation of the inelastic response of the structure through a nonlinear dynamic analysis. The results are compared with different retrofit techniques. A parametric analysis has also been carried out to evaluate the effectiveness of the retrofitting method using different combination of the performance thresholds in accelerations and displacements through fragility analysis. | ||
| Key Words | ||
| damping; fragility; inelastic spectral analysis; retrofit; strengthening; weakening. | ||
| Address | ||
| Stefania Viti; Department of Constructions, University of Florence, Italy Gian Paolo Cimellaro and Andrei M. Reinhorn; Department of Civil, Structural & Environmental Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA | ||