Optimal Values Of Seismic Design Coefficients
Considering Variations Of
Indirect Economic Losses
Author(s)
J. García-Pérez
Abstract
In order to attain optimum design values in the optimization process, it is
necessary to have both initial cost functions and losses due to earthquakes. These
costs are described in terms of design parameters, usually the seismic design
coefficient or the vibration period. Among the losses caused by earthquakes,
there are indirect economic losses called intangibles which may involve human
lives. Here we compute a lower limit to the social value of an anonymous life, in
the sense of how much society is willing to invest in order to preserve a human
life. The human capital point of view is adopted, and it is assumed that the value
of human life would be the expected present value of the income that a person
would have earned in the event that he/she had lived. Then we resort to the
classical reliability theory and use concepts such as probability of failure,
reliability function, hazard function, and their relationships. In order to explore
the influence of intangibles, optimum design coefficients are computed for a
specific site considering that earthquake arrival times constitute a Poisson
process. The results show that the influence of indirect economic losses in the
computation of seismic design coefficients does make a difference and should
not be ignored or assigned arbitrarily.
Keywords: optimization, intangibles, total cost, structural reliability, utility.
1 Introduction
In order to make optimum decisions in earthquake engineering, we must quantify
the consequences of our decisions. In this sense some techniques have been
developed that allow us to obtain the optimum solution in rational decision-
Keywords
optimization, intangibles, total cost, structural reliability, utility
Related Book
Other papers in this volume
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