Intermediate Diaphragm functionality

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Intermediate Diaphragm functionality

What is the difference between modeling a structure with and without intermediate diaphragms. I understand that the weight of the intermediate diaphragms are included in the structure's self-weight, but does the intermediate diaphragms contribute to the transverse stiffness of the deck, like a grillage?

PGSuper uses the approximate

PGSuper uses the approximate method for analysis described in LRFD, which does not include a grillage analysis for lateral stiffness. Intermediate diaphragms only contribute to the dead load of the structure.

Ron Boutilier, P.E.
WSDOT Bridge Design Technology Unit

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