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Title: STATISTICAL DESCRIPTION OF SERVICE LOADS FOR CONCRETE CROSSTIE TRACK
Accession Number: 00300672
Record Type: Component
Availability: Find a library where document is available Abstract: Measurements of loads and bending moments on concrete crossties for several days of revenue traffic were used to develop a statistical description of track loads for tangent and curved tracks that have variable tie spacing. The measured data show large tie-to-tie variations in loads and a load-dependent tie support condition. Many ties were center-bound for loads from light or empty cars, but the tie support became more uniform for heavy wheel loads. Maximum tie bending moments measured on curved track were considerably higher than those on tangent track because of the increase in vertical and lateral loads on the high rail when trains exceed the balance speed of the curve. Tie bending moments measured in this program were considerably lower than the current static flexural strength requirements for a probabilistic prediction of maximum load for a 50-year life. These and data from other concrete-tie test installations indicate a need to identify the failure mechanism for concrete ties so that statistical load descriptions can be used for future design and testing. Low-probability maximum loads will be very important if failures result from infrequent loads that exceed the static strength. However, the higher probability means cyclic loads will be the more important factor if fatigue is identified as the governing failure mechanism.
Supplemental Notes: Publication of this paper sponsored by Committee on Track Structure System Design. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
Monograph Title: Monograph Accession #: 01411530
Authors: Prause, Robert HKish, AndrewPagination: pp 30-39
Publication Date: 1978
Serial: ISBN: 030902840X
Media Type: Print
Features: Figures
(11)
; Photos; References
(5)
; Tables
(2)
TRT Terms: Old TRIS Terms: Subject Areas: Bridges and other structures; Data and Information Technology; Highways; Railroads; Vehicles and Equipment
Files: TRIS, TRB
Created Date: Sep 29 1979 12:00AM
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