What is sucker deck principle for variable depth bridge decks?

What is sucker deck principle for variable depth bridge decks?
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Answer :

For   a   variable   depth   bridge   deck,   the   depth   of   continuous   multi­span   bridge   deck   is increased in pier supports and this absorbs sagging moments in the mid­span with the consequent increase in hogging moments in pier supports. As a result, the mid­span depth can be significantly reduced due to the reduction in sagging moment. In essence, this sucker deck principle  is applied  in locations  where headroom  requirement  is of great concern.   Moreover,   in   terms   of   structural   performance,   sucker   decks   are   effective   in reducing dead loads than voided slab of equivalent uniform depth for span length between 20­40m. In terms of aesthetics point of view, the public tends to appreciate the structural form of arches and curved soffit rather than boring uniform deck alignment. Reference is made to Brian Pritchard (1992).
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