Impact from Railway Loading on Steel Girder Spans

by William G. Byers, (M.ASCE), Bridge Engr.; Western Lines, The Atchison, Topeka and Santa Fe Railway Co., Amarillo, TX,

Serial Information: Journal of the Structural Division, 1970, Vol. 96, Issue 6, Pg. 1093-1103

Document Type: Journal Paper


Results of tests on 37 spans indicate that the distribution of impact magnitudes on railway girder bridges can be approximated by a normal distribution if speed and span length are constant. If speed is increased, impact is increased. If span length is increased, impact is decreased. Impacts on open deck and ballast deck spans are compared. Impact is defined in terms of increased (or decreased) structural response to moving load as compared with static load or in terms of vertical acceleration of the load system. Factors contributing to impact from railway loading are described. Application to a probabilistic design code is suggested.

Subject Headings: Impact loads | Moving loads | Vertical loads | Rail transportation | Steel | Girders | Bridge tests | Railroad bridges

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