STEEL FLOOR SLAB AND BRIDGE

To provide a steel floor slab which can improve fatigue durability, and a bridge.SOLUTION: A steel floor slab comprises: a deck plate; a horizontal rib joined to a lower face of the deck plate, and extending in a first direction; and a plurality of vertical ribs joined to the lower face of the deck plate and the horizontal rib while extending in a second direction intersecting with the first direction, and arranged in the first direction. The horizontal rib has a notched part inserting the vertical rib in an intersection portion of the vertical rib, and the vertical ribs have tapered parts tapered downward as approximating the intersection portion intersecting with the horizontal rib in the second direction, and are welded to the horizontal rib over an entire periphery facing the notched part out of the tapered parts.SELECTED DRAWING: Figure 2 【課題】疲労耐久性を向上することができる鋼床版及び橋梁を提供する。【解決手段】鋼床版は、デッキプレートと、デッキプレートの下面に接合され、第１方向に延びる横リブと、第１方向に交差する第２方向に延びた状態でデッキプレートの下面及び横リブに接合され、第１方向に複数設けられる縦リブとを備え、横リブは、縦リブとの交差部分において、縦リブを挿通する切り欠き部を有し、縦リブは、第２方向について横リブとの交差部分に近づくにつれて下方に先細りとなる先細り部を有し、先細り部のうち切り欠き部に面する全周に亘って横リブと溶接されている。【選択図】図２