Can someone help with simulating this bridge?

Need help setting up the simulation correctly. So i can make changes if needed.
This bridge needs to be 3" wide and 30" Long. And support a load in the middle of 200 lbs.
Your help would be appreciated.
I waster a lot of time designing it in Autodesk Inventor to find out that i can't add the Balsa Wood Material for stress analysis purposes.

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