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new 20m span integral bridge with insitu voided slab

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ahmd8201

Structural
Jun 30, 2014
3
Hi i am designing a new 20m span insitu voided slab integral (portal frame) bridge. I have done the slab as a grillage and used plate elements to model the abutment and pilecap.

in terms of calculations, how do i design the main reinforcement for voided slab? is there any code which gives guidance? slab depth is 1.5m and void is 0.8m so the slab will not act as a cellular slab as ratio is less than 0.6. but i dont know how to do calculation to aashto/aci code.

can anyone suggest an ideas?

thanks,

ahmd
 
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