Vol. I, pp. 3-19
DUCTILE CAST-IRON DECK FOR HIGHWAY BRIDGES
Eiki Yamaguchi1,*, Hironobu Tobinaga2 and Minoru Murayama2
1 Department of Civil Engineering, Kyushu Institute of Technology, Kitakyushu, Japan
2 R & D Center, Hinode Ltd. Miyaki-cho, Saga-ken, Japan
The application of ductile cast iron to a bridge deck was explored. Produced by casting, the deck can be of any shape without welding and expected to have little possibility of fatigue crack. The deck would be light also, about a half of the RC deck slab, so that it could enhance the seismic resistance of a bridge. The deck was designed, following the Japanese design specifications for steel highway bridges. To that end, the design analysis was done by 3-D FEM to take local stress into account, making the maximum stress smaller than the allowable value. The first challenge in this research is to produce a ductile cast-iron deck with uniform material property: difficulty arises from the fact that it is not only quite large but also thin relative to the width. Through computational simulations and actual casting trials, the ductile cast-iron deck panel has been produced successfully. To investigate its structural behavior, the panel was loaded statically at its center. Ductile structural behavior has been confirmed. Fatigue test was then carried out. No fatigue cracks occurred even when the number of the loading cycles reached 10,000,000.
Ductile Cast-Iron; Bridge Deck; Static Loading Test; Fatigue Test