Development and Limit State Design Method of Ladder Sleeper
Hiromi INOUE, Masamichi SOGABE, Nobuyuki MATSUMOTO, Hajime WAKUI
The Ladder Sleeper has been developed to minimize the maintenance cost only by
replacing crossties in the conventional ballasted track. It has been advanced
also aiming to build a low-cost and environmentally friendly non-ballasted track
on new lines. The limit state design method for the Ladder Sleeper was studied
taking the ballasted track, which requires various examinations on the supporting
conditions, as an object. The quasi-static wheel load was mainly applied as the
design load. The member forces of longitudinal beam and connectors were evaluated
using the results of structural analysis and vehicle running tests.