Briefly explain Pigeauds method used for design of two way slabs subjected to concentrated loading.
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Answer:
Slab and girder bridges are used when the economical span limit of solid slab bridges is exceeded. For simply supported spans, this limit is generally found to be nearly 10 metres and for continuous or balanced cantilever type structures, this limit is 20 to 25 metres.
The deck slab of a slab and girder bridge spans transversely over the girders which run longitudinally spanning between abutment or pier supports. The spacing of the girders depends on the number of girders to be provided in the deck which again is related to the cost of materials, shuttering, staging etc.
Closer beam spacing means lesser thickness of deck slab and consequently savings in concrete and steel in deck slab but since the number of beams is more in that case, this increases the quantity of concrete, shuttering and reinforcement for girders and for longer spans where bearings are required, the number of bearings.
Therefore, the most economical arrangement of bridge deck varies from place to place depending on the cost of materials, shuttering, staging etc., in that locality. It has been observed that three beams deck is generally found economical than two, four or five beams deck having a carriageway for two lanes. The girder spacing’s in such cases are usually between 2.25 to 2.75 metres.
Explanation:
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