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grillage analysis of a composite beam of a bridge

grillage analysis of a composite beam of a bridge

grillage analysis of a composite beam of a bridge

(OP)
Hey guys,

I would like to ask you how to model a concrete slab on two steel girders for a bridge in FEM software uaing grillage method ( i have GSA Oasys as software)? How to determine the section properties ( E, I, G and J) of the longitudinal elements representing the slabs and the steel girders? I think we need to calculate all section properties in ‘steel units’, using a transformed area for the concrete flange (divide by the modular ratio n) but i do not know how to calculate them. Can anyone help me please?

Daryl

RE: grillage analysis of a composite beam of a bridge

You are correct that for composite design, you need to use the transformed area. Any reputable steel design book or google search will explain this. So if you only have 2 girders and a slab spanning between them, I would question the economics of using composite design since you don't have a slab on both sides of the beam. Also, I am not seeing how two girders provides any sort of grillage arrangement. FEM seems like overkill for this, use pencil and paper.

RE: grillage analysis of a composite beam of a bridge

(OP)
Thank you for your response.
I have found something on the grillage analysis http://www.steelconstruction.info/Modelling_and_an.... i need to define the modulus of elasticity and shear modulus of the longitudinal elements in FEM, so i need to find a way to calculate these properties for the composite action. While the transverse elements will only have the concrete properties.

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