An Analysis on Conventional Design Method and Actual Dynamic Loading State of PC Crossties
Hiroyuki OKUDA, Hajime WAKUI
In order to rationalize and improve PC crosstie design, it is necessary to convert
their design method to a new one, composed of impact wheel load, dynamic response
and limit state design methods, from the conventional design method composed of
quasi-static wheel load, static response and allowable stress design methods. As
the first step, an analysis on current design load values and an investigation on
actual dynamic loading state of PC crossties were carried out. Impact wheel load,
mainly due to wheel flats, can be simplified as triangular pulses, which have 1 to
10 milli-second duration and an estimated 400kN peak value at maximum.