Cable Stayed Bridges

My final project for my structural design class consists of making a bridge that spans 16", resist 40lbs, and look f'en amazing. The design the we made definitely looks cool but I am not satisfied with its structural stability. I know that the two pylons you see at the bottom will bend in towards the middle of the bridge. This bridge is FAIL. What I hope to overcome from this experience is to be more assertive and address my problems with designs like this to my teammates.


Anyway

Just wanted to comment... that cable stayed bridges are best used when there are anchors to tie down the cables...