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Dynamic Assessment of Timber Railroad Bridges Using Displacements

Author(s)
Moreu, F.Jo, H.Li, J.Kim, R. E.Cho, SoojinKimmle, A.Scola, S.Le, H.Spencer, B. F., Jr.LaFave, J. M.
Issued Date
2015-10
DOI
10.1061/(ASCE)BE.1943-5592.0000726
URI
https://scholarworks.unist.ac.kr/handle/201301/17447
Fulltext
http://ascelibrary.org/doi/10.1061/%28ASCE%29BE.1943-5592.0000726
Citation
JOURNAL OF BRIDGE ENGINEERING, v.20, no.10, pp.04014114
Abstract
Infrastructure spending is such a large component of a railroad budget that it must be prioritized to meet the concurrent safety and line capacity requirements. Current bridge inspection and rating practices recommend observing bridge movements under a live load to help assess bridge conditions. However, measuring bridge movements under trains in the field is a challenging task. Even when they are measured, the relationships between bridge displacements and different loads/speeds are generally unknown. The research reported herein shows the effects of known train loadings, speeds, and traffic directions on the magnitude and frequency of displacements as measured on timber pile bents of a Class I railroad bridge. Researchers collected both vertical and transverse (lateral) displacements under revenue service traffic and work trains using LVDTs with a sampling frequency of 100 Hz. To investigate the effect of traffic on timber railroad bridges, displacements were measured under crossing events at different speeds and directions of a test train of known speed and weight provided by the railroad for the field experiment. The results indicate that bridge transverse displacements could help to capture critical changes in timber railroad bridge serviceability (i.e., ability to safely carry out railroad operations) as a function of railroad loading, speed, and direction. (C) 2014 American Society of Civil Engineers
Publisher
ASCE-AMER SOC CIVIL ENGINEERS
ISSN
1084-0702
Keyword
ROBOTIC TOTAL STATIONSPAN RAILWAY BRIDGETRAINDEFLECTIONSSYSTEMFIELD

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