System reliability-based design optimization of flexible pavements using adaptive meta-modelling techniques

Dilip, DM and Sivakumar Babu, GL (2023) System reliability-based design optimization of flexible pavements using adaptive meta-modelling techniques. In: Construction and Building Materials, 367 .

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Abstract

Recognizing the need for sustainable and long-lasting structures, reliability-based designs have been gaining acceptance in the pavement engineering community. The Reliability Based Design Optimization (RBDO) is formulated to design cost-effective flexible pavements in the presence of uncertainties. Two meta-modelling approaches are considered in this study, the second-order adaptive Response Surface Model (RSM) and the adaptive Polynomial-Chaos based Kriging (PC-Kriging) meta-model. The study highlights the need for adaptive meta-modelling techniques in the reliability-based design of pavement structures, through the quantification of the epistemic uncertainty. For the numerical examples considered in this study, the model uncertainty was found to be around 1 for three-layer sections and below 2.5 for four-layer pavements. To address the correlation between the pavement failure modes, a System Reliability Based Design Optimization (SRBDO) approach is proposed in this paper. The SRBDO methodology is further adapted to design the optimum combination of pavement layer thicknesses and moduli, to meet the target levels of reliability, given the expected traffic demand and subgrade strength at a pavement site. Thus, the SRBDO formulation using adaptive meta-models, presented in this study, efficiently integrates the economic analysis of various pavement design alternatives with the Mechanistic-Empirical procedure in a system reliability framework.

Item Type:	Journal Article
Publication:	Construction and Building Materials
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier.
Keywords:	Cost effectiveness; Economic analysis; Machine design; Pavements; Reliability analysis; Structural design; Uncertainty analysis, Epistemic uncertainties; Flexible pavements; Kriging; Metamodeling techniques; Polynomial chaos; Polynomial-chaos based kriging; Reliability-based design optimization; Response surface modelling; System reliability; System-reliability-based design, Kriging
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	09 Feb 2023 05:34
Last Modified:	09 Feb 2023 05:34
URI:	https://eprints.iisc.ac.in/id/eprint/80104

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