Pratt Truss Bridge
Built by Bill H.
Here is the email Bill sent me:
I started making bridges about a year ago and have pictures to share with you. For the first bridge I used a set of plans that I found free on the internet from a guy who was in the army. The bridge plans were designed to be made 100% from manilla folder paper. The plans were to fold the manilla cardboard into the different post diameters and use them to make the trusses.
I decided to use dowels from my local Lowe’s instead. However, I did use the manilla cardboard to reinforce some of the joints and to give thebridge a real look.
You can find the plans for this bridge here:
Manilla File Folder Bridge
This truss bridge uses the Pratt truss model for its design. The Pratt truss is one of my favorites because the longer diagonal members are in tension. This allows the shorter vertical pieces to be in compression.
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K thanks this web site helped me and my partner out to figuare out what to do on our pro… we still need a little more info so maybe you could add just a little bit more info on this web site and you have the best web site in town,…. take my idea in to thouught and thanks.
Kristina, is there something specific you want to know more about?
interesting, how did you make a bridge out of mannila folder?
I wonder how you build a truss bridge out of gumdrops that will hold 15 books?!
I’m designing a bridge out of balsa wood with the Pratt truss and it is required to sustain 50lbs of load in the center. I can’t figure out how lay out the road of the bridge. I tried to see how you did it by looking at your final results but I’m stuck. The members in the center of the truss which are under compression are as wide as the members running parallel to the ground so there is no room for a plank to rest on the members that run parallel to the ground. Any ideas?
Hi. I am actually building a model bridge like this for my physics class. I am not the best cutter or gluer so I was wondering if you had any tips that I could use in order to help the bridge withstain the twenty-five pounds of weight that it will be tested with.
I need to know how to like build a bridge, for this class i’m taking.. any advice?
hi, im doing a project on which truss design is the strongest and i wonder if you can help me on it. can you recommend me to any good sites where i can find good information? *im not saying that yours isnt helpful)(its helped me understand what they are and how to design one but i have to make them all equally strong) send me a email once you read it thanks
p.s. my emails falcon88sung@hotmail.com. send me a reply quickyl! my project is due tuesday!