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Home > Forums > Structural Engineers > Activities > Finite Element Analysis engineering Forum

 FEA of a composite box girder bridge

thread727-34690
alighalib (Civil/Environme)
21 Oct 02 14:19
Hi

A composite box girder bridge is composed of a an open steel box girder attached to a top concrete deck.  The open steel box girder is made of two 4 ft deep by 1/2 in thick web plates welded to a common bottom flange plate (3ft wide by 1/2 in thick) and two top plates one for each web (1 ft wide by 1/2 in thick).  An 8 inch thick concrete slab is attached to the top box flanges through shear connnectors, so that the two systems (slab and box) acts compositely.

I am modeling the system as a 3D flat plates with 5 DOF.  In order to preserve the composite section properties of the deck-box system, I hadto offset the deck elements to the mid-plane of the concrete deck, i.e. 1/2 the slab thickness above the steel girder top flange, and then I had to connect the opposite nodal points of both steel top flanges and concrete deck with rigid links.  

Is there a better way of doing this.  I am using STAAD-PRO.

Regards

   

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