I built this popsicle stick bridge to complete my short popsicle bridge series. This bridge uses the Howe Truss design. Previous to this I had built bridges using the Pratt and Warren trusses. This bridge was 13.5 inches long and used 50 popsicle sticks. It ended up holding 117 pounds before failing. Here is a video of the testing procedure:
I changed up the testing with this bridge. Instead of placing one very large weight directly on the bridge, I started with a small weight. This increased the concentration of the load in the middle of the bridge. I figured this would be more realistic to the way bridges would be tested when built by other people. This is why I think this bridge held significantly less than the Short Pratt Truss Bridge.
You can purchase blueprints for this popsicle bridge in my store.