Dimension of beam for bridge

[1david1]

Hi!

My first post here.

I need a beam for a bridge. The beam should be positioned as per the picture and thus protrude about 3 meters.
How thick of an HEB-beam do I need?
Can the beam be laid as a lying H instead of a standing H to get less deflection at the outer end?
I want the bridge to be as stiff as possible, of course.

I attach the beam with M20 threaded rod in the foundations.

Grateful for an answer.

Regards, David

 

[Lennart12]

Hi, are you going to have one beam or two beams with an intermediate "floor"?

The beams should be rotated as below for minimal deflection/bending.

 

[1david1]

Thanks for the response. It should be just like you draw in your picture. Two beams with a coarse decking lying perpendicular to the beams.

 

[1david1]

The bridge should be about 3200 wide.