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Life-cycle cost analysis of supplemental damping

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This paper illustrates a method for assessing the economic effects of supplemental damping in a building design (new or rehabilitation scheme) over a given time period of interest. The method involves simulation of life-cycle costs and benefits (in terms of avoided loss) attributable to earthquake hazard over a user-defined time period. At each time step, the capacity of the building is a function of the capacity and earthquake performance at the previous time step. The method allows for the user to specify the threshold for capacity updating, as well as the level of damage at which repairs will be made (i.e. losses will actually be incurred). The simulation method is illustrated through a case study of a high-rise steel moment frame building located in a region of high seismicity. The effects of adding supplemental damping to the building are investigated for several time periods. Time periods of 5, 15, 30, 50 and 100 years are used, and, for each time period, damping ratios of 5%, 10%, 20% and 30% of critical are used. The results can be used to help determine whether it is beneficial or not to incur the extra cost associated with adding supplemental damping in the building design. For example, for a 30-year time period, the results show that it would be beneficial to use supplemental damping devices to increase the damping to 10% if the added cost is less than US$4·9 million, to 20% if the added cost is less than US$8·3 million, and to 30% if the added cost is less than US$10 million. Similarly, if an additional US$3·25 million is spent to increase the damping in the building to 20%, the results show that it would take approximately 15 years to recover the additional cost in terms of expected loss reduction. The paper also discusses the limitations associated with these results. Copyright © 2001 John Wiley & Sons, Ltd.
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Document Type: Research Article

Affiliations: Hart-Weidlinger Division, Weidlinger Associates Inc., Los Altos, CA, U.S.A

Publication date: 2001-12-01

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