Impact Load Distribution in Concrete Bridge Ties
Publication: Journal of Structural Engineering
Volume 115, Issue 3
Abstract
Railway tracks and bridges are subjected to impact loading in excess of the static weight of the vehicles because of imperfections in the track and vehicle wheels. Current design criteria for concrete tract ties, as required in Chapter 10 of the American Railway Engineering Association's Manual of Railway Engineering, stipulate an “impact factor” of 150% to be applied to the static weight of the vehicles for design of track ties. There are no such provisions for concrete bridge ties or other bridge deck components, e.g., rails, clips, etc., that comprise an open deck railway bridge. Using a full‐scale open deck railway bridge model with nine precast prestressed concrete ties, an analytical‐experimental study was conducted to establish the percentage of impact load transmitted to the individual ties and the influence of some selected parameters on this load. The results showed that the impact loading transmitted to the ties was largely influenced by the shape and stiffness of rail‐tie pad and was independent of the tie support conditions.
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Copyright © 1989 ASCE.
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Published online: Mar 1, 1989
Published in print: Mar 1989
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