Vertical Accelerations Of Bridges – A New Limit State
Author(s)
L. Frýba
Abstract
Vertical accelerations of bridges - a new limit
state
L. FGba
Institute of Theoretical and Applied Mechanics, Academy of Sciences of
the Czech Republic, Czech Republic
Abstract
The high speed trains intensively excite the railway bridges and destabilize
the ballast in some cases. Therefore, a simple theoretical model of a bridge
was set up and yields the deflections, bending moments and vertical accelerations.
The paper shows the effect of the train speed, span of bridges,
their weights and damping on the vertical accelerations of bridges. Both
concrete and steel bridges of spans 5 to 50 m, three types of trains, ICE 2,
Eurostar (TGV) and Talgo AV2, at speeds 5 to 500 km/h were investigated.
The highest dynamic effects appear at resonance.
1 Motivation
A long sequence of axle forces, which are in almost regular distances, offers a
simple load model of new types of high speed trains. A resonant vibration of
bridges occurs in some cases and results in the destabilization of ballast on
bridges
Keywords
Related Book
Other papers in this volume
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