topic Re: Defining a mixed section in Structural Bridge Design Forum

Defining a mixed section

Anonymous — Fri, 29 Oct 2021 09:17:38 GMT

Hello everyone,

I just started using autodesck bridge design for a scholar project. I designed the section bellow in design section but I'wasn't able to find it in design beams. How can I define the beams for this type of bridges.

Kind regards.

Re: Defining a mixed section

dave_geeves — Fri, 29 Oct 2021 10:57:55 GMT

Hi,

It is not clear from your post as to what design standard you are using. If you are using British, Eurocodes or AASHTO LRFD standards then you will be able to define a design beam of the type "Steel Composite". For AS5100 this type of girder is not supported so you will not be able to create a design beam of this type.

I hope this is the information you need but please let me know if I have not understood correctly.

Kind regards

Dave Geeves

Re: Defining a mixed section

Anonymous — Fri, 29 Oct 2021 13:25:17 GMT

Hi,

Thank you for your response.

In fact, I'm designing this bridge using Eurocodes.

I defined the section here.

But when arriving to design beam I can't find where to use the section defined above, and how to define whether it's the reinforced concrete section or the steel section.

Re: Defining a mixed section

dave_geeves — Fri, 29 Oct 2021 14:06:03 GMT

It will be a Steel Composite beam. You will only be able to define a single steel plate girder to represent half your full section as this is how these girders are generally designed. You can define two of these girders, one for each half, and then create a structural model as a "grillage" with longitudinal members and transvers members (representing the lateral bending of the slab)

The examples manual (Help - main menu) can be used to find out how to do this. An example on defining a steel composite can be found here.

I hope this helps

Kind regards

Dave Geeves