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Title: Quantile value method versus design value method for calibration of reliability-based geotechnical codes
Authors: Ching, J.
Phoon, K.-K 
Keywords: Design codes
First-order reliability method
Geotechnical engineering
Reliability-based design
Issue Date: Sep-2013
Citation: Ching, J., Phoon, K.-K (2013-09). Quantile value method versus design value method for calibration of reliability-based geotechnical codes. Structural Safety 44 : 47-58. ScholarBank@NUS Repository.
Abstract: This paper compares two methods for geotechnical reliability code calibration, namely the well known design value method (DVM) based on first-order reliability method and a recently developed method based on quantile, called the quantile value method (QVM). The feasibility of calibrating a single partial factor to cover the wide range of coefficients of variation (COVs) commonly encountered in geotechnical designs is studied. For analytical tractability, a simple design example consisting of one resistance random variable and one load random variable is first examined. A resistance factor is first calibrated using a single calibration case associated with a typical COV. The objective is to evaluate the departure from the target reliability index analytically when this calibrated resistance factor is applied to validation cases associated with a range of COVs. The results show that QVM is more robust than DVM in terms of achieving a more uniform reliability level over a range of COVs. Two realistic geotechnical design examples are studied to demonstrate that the theoretical insights garnered in the simple analytical example are applicable. © 2013 Elsevier Ltd.
Source Title: Structural Safety
ISSN: 01674730
Appears in Collections:Staff Publications

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