Fatigue evaluation of the increased weight limit on transit railway bridges.

Nassif, Hani; Ozbay, Kaan; Lou, Peng; Su, Dan

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Fatigue evaluation of the increased weight limit on transit railway bridges.

2014-09-01
By Nassif, Hani ; Ozbay, Kaan ; Lou, Peng

File Language:

English

Details

Creators:

Nassif, Hani ; Ozbay, Kaan ; Lou, Peng ; Su, Dan
Corporate Creators:

Mineta National Transit Research Consortium
Corporate Contributors:

United States. Department of Transportation. Research and Innovative Technology Administration ; Rutgers University
Subject/TRT Terms:
Publication/ Report Number:

CA-MNTRC-14-1143
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

Mineta National Transit Research Consortium
Abstract:

The recent increase of freight railcar weight limits from 263,000 lbs. to 286,000 lbs. raises concerns for the safety of bridges ; on transit passenger rail systems, since they were not designed for this weight increase. Thus, there is a need to assess the ; impact of the weight increase on those bridges prior to utilizing passenger lines for freight transportation. This study introduces ; an accurate approach to ascertaining the remaining fatigue life of steel railway bridges. The analysis results indicate that heavy ; freight cars have a significant effect on critical locations near bridge supports. The introduction of heavier rail equipment will ; have a much more significant effect on shorter spans (span lengths of less than 60 ft.) than on long spans. This will allow transit ; operators or agencies to prioritize and schedule repairs and rehabilitation. An increase of 1,000 freight trains per year will shorten ; the remaining fatigue life by approximately 2 years. The relationship between annual freight train frequency and remaining fatigue ; life could help transit operators or agencies to balance the tradeoff between economic benefit and bridge rehabilitation cost.
Format:

PDF
Funding:

DTRT12-G-UTC21
Download URL:

https://rosap.ntl.bts.gov/view/dot/28090/dot_28090_DS1.pdf
File Type:

[PDF - 2.12 MB]
Collection(s):

University Transportation Centers ; US Transportation Collection
Main Document Checksum:

urn:sha-512:3a5f0c50555502b26e74c50cc81d7955d401b620406ceff4986a85d0cfecf51bb9e046bd8432693818d469739683e03772ae3d766c702056de6b42361ab6363f

File Language:

English

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