3.4.3 Calibration by Reliability Theory
In the LRFD calibration using the theory of reliability, the foundation resistance and the
loads are considered as random variables. Therefore, the resistance and the loads are
incorporated in the design using their statistical distributions. Today, these concepts have
been included in the bridge design guidelines of the United States Federal Highway
Administration (FHWA, 1998). Based on these guidelines, the statistical concepts relevant
to the calibration procedure are discussed in the next section.
3.4.3.1 Variability of Soil Data
A quantitative measure of the variability of site soil can be provided by the coefficient of
variation (COV) of a given soil property, X, defined as follows
3.4.3 Calibration by Reliability Theory
In the LRFD calibration using the theory of reliability, the foundation resistance and the
loads are considered as random variables. Therefore, the resistance and the loads are
incorporated in the design using their statistical distributions. Today, these concepts have
been included in the bridge design guidelines of the United States Federal Highway
Administration (FHWA, 1998). Based on these guidelines, the statistical concepts relevant
to the calibration procedure are discussed in the next section.
3.4.3.1 Variability of Soil Data
A quantitative measure of the variability of site soil can be provided by the coefficient of
variation (COV) of a given soil property, X, defined as follows
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