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Voided and Cellular Decks
In modelling
voided and cellular decks the modelling method adopted must be tailored to such the
structural behaviour expected. Where voids are small
the deck may be modeled as a slab structure and a plate, shell
or grillage model
may be appropriate.
Hambly suggests that where the void size exceeds 60% of the depth, the deck is generally considered to be of cellular construction with a different behaviour [compared to slab decks].
"Bridge Deck Behaviour" Edmund C Hambly (Chapman & Hall), last revised 1990, in particular pages 7, 12 & 15 and chapters 3 ("Slab decks") and 5
("Multicellular decks").
West suggests that where the voids constitute an area of <60% of the deck cross section, transverse shear deformations are considered to be small enough to treat the deck as a pseudo-slab structure.
"Recommendations On The Use Of Grillage Analysis For Slab And Pseudo-Slab Bridge Decks" R West (C&CA/CIRIA)
Further guidance on bridge deck modelling is available in the more recent (1999) publication "Bridge Deck Analysis" Eugene J. O'Brien and Damien L. Keogh (E&FN
SPON)
Advice on creating a model is available through the Help menu.
Help Topics > Contents tab > Modeller user manual > Building a model
The "Slab load optimisation" example is
available from the Windows Start Menu
Start > Programs > LUSAS13 for
Windows > LUSAS Examples > Civil & Bridge examples > Slab Load
Optimisation
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