Abstract
This study aims to develop Load and Resistance Factor Design (LRFD) provisions for movable bridges’ mechanical components. It requires the formulation of the limit state functions, determination of the statistical parameters of loads and resistances, development of the reliability analysis method, selection of target reliability indices, and calibration of load and resistance factors. The service and overload limit states for electric and hydraulic motors were considered. Movable bridge owners and operators were surveyed to gather information about the bridge’s condition. The survey results helped to define the limit state functions and the acceptability limits. The target reliability index was established based on movable bridge performance determined by the bridge owner survey. It was concluded that the target reliability index is the same as is used in current practice. Finally, load and resistance factors were calculated and verified so that designed movable bridges’ mechanical components meet minimum safety requirements. The project results will be submitted for consideration as updates to the AASHTO LRFD Movable Highway Bridge Design Specification.
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Acknowledgments
The presented research was partially sponsored by NCHRP 12-112, represented by Waseem Dekelbab, which is gratefully acknowledged. The opinions and conclusions expressed or implied are those of the authors and they are not necessarily those of the Transportation Research Board, the National Research Council, the American Association of State Highway and Transportation Officials, or the Federal Highway Administration, US Department of Transportation. Thanks, are also due to Dr. Patryk Wolert, and Alec Noble, and Steve Mikucki from Hardesty & Hanover, LLC for their discussion and valuable comments. The authors confirm contribution to the paper as follows: study conception: J. Michael Stallings, A.S. Nowak, A. Ramesh Babu, Sylwia Stawska. Movable bridge expert contribution: Jeffrey Newman, Modjeski, and Masters. Inc., and Jim Phillips, Hardesty & Hanover, LLC. Analysis and interpretation of results: A. Ramesh Babu, S. Stawska; draft manuscript preparation: A. Nowak, S. Stawska. All authors reviewed the paper and approved the final version of the manuscript.
References
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Information
Published In
Journal of Bridge Engineering
Volume 27 • Issue 1 • January 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jan 12, 2021
Accepted: Sep 16, 2021
Published online: Nov 9, 2021
Published in print: Jan 1, 2022
Discussion open until: Apr 9, 2022
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