Well with the Timber Framers Guild 2017 convention right around the corner (May 19-21). And being that this year it will be held in Madison, WI (at the Edgewater Hotel). I have a peaked interest in attending this event to help in the construction of a 95 foot long walking bridge on site during the convention.
I have made contact with the TFG about this project and they passed my name along to Johnathan Orpin of New Energy Works and he got back to me with some information. In the mean time I decided to reverse engineer the bridge from the picture to see if I could better understand the bridges design and construction.
I decided to use soda straws and hot glue to construct a model. My first attempt was, shall I say, an enlightening challenge to say the least. The picture proved to be a bit of an optical illusion because of the 3/4 angle it was shot at. Good for selling a used car but not for getting design construction details. After some trial and error I had the basic concept and design of the bridge figured out. I went to work with my calculator and made a CAD drawing that was at a 1:12 scale. Keeping in mind the head clearance heights that would be needed I made the base of the main section (a three sided tower) 12 feet and then tapered it down to 8 feet two sections down. Keeping this all in proportion was the task.