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.,
Vijay K. Garg, (M.ASCE), Manager; Dynamics Research Div., Tech. Center, Association of American Railroads, Chicago, Ill.,

Serial Information: Journal of the Structural Division, 1979, Vol. 105, Issue 9, Pg. 1823-1844

Document Type: Journal Paper


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.

Subject Headings: Railroad bridges | Railroad trains | Bridge-vehicle interaction | Structural models | Girder bridges | Degrees of freedom | Vehicles | Numerical methods

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