Method and manufacturing method for suppressing fatigue crack initiation in steel deck

摘要

To provide a suitable method to suppress in steel plate decks occurrence of fatigue cracks at the weld root part where closed sectional ribs and deck plates are joined and progress of the fatigue cracks after occurrence of fatigue cracks at the root part.SOLUTION: A method to suppress fatigue crack is applied to steel plate decks which include deck plates with upper and lower surfaces and long ribs which are welded on the lower surfaces of the deck plates and form closed sections between the deck plates and the lower surfaces. The method includes a pressing process in which first and second pressing members provided on the inner side of the ribs are moved in relatively separating directions in the thickness direction of the deck plates and the deck plates and the ribs are pressed by the first and the second pressing members in relatively separating directions in the thickness direction and, after the pressing process, an unloading process in which the first and the second pressing members are moved in a direction relatively approaching in the thickness direction.SELECTED DRAWING: Figure 13