| 摘要 |
PROBLEM TO BE SOLVED: To prevent a concrete floor slab from cracking by forming the positive bending section in the central part of a span to have a composite structure made of the concrete floor slab and steel girders and forming the negative bending section on the intermediate support point to have an integral structure of steel floor slabs and steel girders. SOLUTION: The nearby position of the intermediate pupport point 6 of a continuous composite bridge 1 is formed as a negative bending section L and both sides thereof are formed as boundary sections L1 and further, both sides thereof are formed as positive bending sections L2 . A steel floor slab 3 is installed and welded as the upper flange of a steel main girder 2 constituted of the lower flange 7 and the web 8, in the negative bending section L and the boundary section L1 . Then, concrete is placed on the central section L3 of the upper face of the steel floor slab 3 to construct a concrete floor slab 12 and connect the floor slabs 12, 3 with fixing tools 13 for slabs. Further, concrete floor slabs 4 are laid on the upper end of the web 8 through the upper flange 10, in the positive bending section L2 . Stoppers 11 against shifting or the concrete slab, attached to the upper flange no are embedded in the floor slab 4 to construct a steel-concrete composite girder. In this way, the floor slab 4, 12 can be prevented from cracking. |
