| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel floor board having a structure which suppresses fatigue cracking occurring to a rib intersection part and does not cause web base materials of a longitudinal rib and a lateral rib to frequently crack without omitting a slit, and a steel floor board bridge with the same.SOLUTION: A steel floor board includes at least a steel plate, a longitudinal rib as a stiffener, and a lateral rib, a lateral beam or a diaphragm. At an intersection part of the longitudinal rib and the lateral rib, lateral beam, or diaphragm, a substantially U-shaped cut part is provided to a web of the lateral rib, lateral beam, or diaphragm, and a thin-width member is formed. Furthermore, curved parts whose outer edges are in a curved shape are formed at both ends of the cut part. The thin-width member is between the longitudinal rib and cut part, and adjoins the curved part, and is further arranged substantially in parallel with a web direction of the longitudinal rib. The thin-width member is welded to a web of the longitudinal rib, and the longitudinal rib and the lateral rib, lateral beam, or diaphragm are joined together. |
