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Fatigue life of critical members in a railway truss bridge
Author(s) -
Garg Vijay K.,
Chu KuangHan,
Wiriyachai A.
Publication year - 1982
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.4290100604
Subject(s) - ton , engineering , train , bridge (graph theory) , structural engineering , truss bridge , truss , deck , freight trains , forensic engineering , medicine , cartography , fishery , biology , geography
The fatigue life of critical members, such as hangers, floor‐beams and stringers in a single track, open deck railroad truss bridge, was investigated for various unit freight trains, operating at different speeds. A partial bridge model was used, along with a three‐car train, to determine the stress cycles. For determining the fatigue lives of critical members, four fully‐loaded trains per day were assumed to pass over the bridge. Each train was assumed to consist of one hundred 70‐ton cars or seventy 100‐ton cars. The 100‐ton freight cars cause large stress ranges, and consequently shorter fatigue lives than the 70‐ton freight cars. For the hundred‐car train, with 70‐ton and 100‐ton cars mixed in various proportions, the fatigue lives became shorter as the percentage of 100‐ton cars in the consist was increased. The impact percentages were also studied.