Development of Traffic Live-Load Models for Bridge Superstructure Rating with RBDO and Best Selection Approach
Publication: Journal of Bridge Engineering
Volume 24, Issue 8
Abstract
Reliability-based design optimization (RBDO) is frequently used to determine optimal structural geometry and material characteristics that can best meet performance goals while considering uncertainties. In this study, the effectiveness of RBDO to develop a load rating model for a set of bridge structures was explored, as well as the use of an alternate best selection procedure that requires substantially less computational effort. The specific problem investigated was the development of a vehicular load model for use in bridge rating, where the objective of the optimization is to minimize the variation in reliability index across different girder types and bridge geometries. Moment and shear limit states were considered, where girder resistance and load random variables were included in the reliability analysis. It was found that the proposed best selection approach could be used to develop a rating model nearly as effective as an ideal RBDO solution but with significantly less computational effort. Both approaches significantly reduced the range and coefficient of variation of the reliability index among the bridge cases considered.
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Published In
Journal of Bridge Engineering
Volume 24 • Issue 8 • August 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Jan 14, 2019
Accepted: Mar 26, 2019
Published online: May 21, 2019
Published in print: Aug 1, 2019
Discussion open until: Oct 21, 2019
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