It made good use of the cheap wood which was readily available.

## Garrett's Bridges

As designed, the Fink requires less wood… even with a beam removed, the Pratt requires more than the Fink… but if we remove two beams from the Howe, it would require less wood than the Fink. I use diagrams showing the load applied to the top of the bridge, because this is how I most often test my bridges.

Each of the following truss designs are very common in both real and model bridges because of their sound engineering and ease of construction.

Where are the compression and tension forces distributed in the bridge?

## Garrett's Bridges

You can also subscribe without commenting. Post to Cancel. A little trickery gets me from forces in beams… to equations… the left column is x-components and the right column is y-components:.

You show a black line directly above the 100 load, and also a 0 in red and 100 in black. It is easy to understand and to follow, and is a great fit for students who are just learning, but advanced enough to be a great resource to those with more experience.

More or less a spaghetti bridge. And if we were to subtract 4 meters, by removing the unstressed beam…. Plus, the roof has more resistance too because of that. For model bridges, we typically only use wood.

The purpose of this post was to see how different the trusses are, under the same load. Our compression and tension members are both made out of wood.

## Roof truss types

I have chosen to highlight these four examples of different trusses to get you started with some very solid examples that you can easily use on your bridge. That is, we need 44.

Let us know what you have to say: Instead, they opt for full pieces of wood and thus lower the amount of labor necessary for working with them.

To find out more, including how to control cookies, see here: Each has a total snow load of 2400 Newtons.

## Howe Trusses

I need to outright declare that there are no forces in the following beams — because there are no such beams! We have letter labels instead of numbers. If you need to see them, go look at the two previous roof truss posts.