2019 Volume 73 Issue 1 Pages 295-302
This study is an experiment study about the dynamic influence in the load fluctuation to occur when a large vehicle passes an expansion joint. We were carried out wheel running fatigue tests by constant load and the vibration load using the RC slab test specimen. The experiment evaluated a fatigue resistance and an experiment impact coefficient. As a result, the fatigue life of vibration load applied load amplitude ±20％ or ±30％ of RC slab specimen was reduced by 60％ or 90％ compared to the fatigue life of RC slab specimen applied constant load. In addition, the experiment impact coefficient was far exceeding the impact coefficient specified of Specifications for highway bridges. It is thought that it is necessary to suppress deflection by increasing bending stiffness of RC slab near expansion joint and maintain expansion joint’s level difference according to fatigue life required by RC slab.
