American Society of Civil Engineers

Railway-Bridge Impact: Simplified Train and Bridge Model

by Kuang-Han Chu, F.ASCE, (Prof. of Civ. Engrg., Illinois Inst. of Technology, Chicago, Ill.), Chaman L. Dhar, (Grad. Student, Civ. Engrg. Dept., Illinois Inst. of Technology, Chicago, Ill.), and Vijay K. Garg, M.ASCE, (Manager, Dynamics Research Div., Tech. Center, Association of American Railroads, Chicago, Ill.)

Journal of the Structural Division
, Vol. 105, No. 9, September 1979, pp. 1823-1844

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Document type: Journal Paper
Discussion: by Mahlon J. Plumb    (See full record)
Errata:(See full record)
Closure:(See full record)
Abstract: A lumped mass model of a railway bridge is developed where only the vertical degree-of-freedom for each joint is considered. The vehicle system is idealized as a three degree-of-freedom model of a railway vehicle consisting of the carbody and wheel-axle sets. Dynamic interaction equations for the bridge-vehicle system are derived and solved using the numerical integration method. Impact factors for member forces and nodal deflections are generated under the action of a single or a series of three moving vehicles. Impact factors are compared with AREA specifications for truss and girder bridges.

ASCE Subject Headings:
Girder bridges
Impact forces
Railroad trains