For a 250mm deck slab this results in a maximum span for the slab of about 4m. This spacing is in keeping with the utmost span of everlasting formwork, typically about 3.8m. Deck slab cantilevers on the edge of the deck will control the place of the outer primary girders. A cantilever of 1.5m is frequent and can work economically with a 250mm deck slab. With these main dimensional constraints identified, the primary steel grid may be defined to swimsuit the actual geometry and dimensions of the bridge.
The thickness of the composite concrete deck slab on deck type bridges sometimes shall be 250mm. Generally contractors like to use permanent formwork quite than standard timber formwork. Use of proprietary parapet cantilever formwork techniques is now widespread for the deck slab cantilevers. Cantilever length is often not more than half the girder spacing on multi-girder decks, typically 1.5m. The designer needs … Read More