The Structural Engineer > Archive > Volume 68 (1990) > Issues > Issue 12 > Correspondence on The Global and Local Behaviour of Bridge Deck Slabs by Dr. P.A. Jackson
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Correspondence on The Global and Local Behaviour of Bridge Deck Slabs by Dr. P.A. Jackson

The author discusses the Ontario bridge Code with its need for only 0.3% reinforcement in each face/direction, compared with three to four times this amount when the slab is designed to BS 5400 with local and global flexure both evaluated and added algebraically. I would concur that the BS 5400 rules for maximum calculated crack width also frequently govern the amount of reinforcement. Indeed, when marine exposure conditions apply, demanding a maximum crack width of only 0.l mm, the reinforcement requirements can be almost impracticable. In this respect, the opportunity to reduce the reinforcement content is welcome. Mr. A.C.G. Hayward