This happens especially to the members near the center of the bridge. Interestingly, as a load (such as a car or train) moves across the bridge sometimes the forces for a member switch from compression to tension. The equilateral triangles minimize the forces to only compression and tension. This is opposed to the Neville Truss which used isosceles triangles. The Warren Truss uses equilateral triangles to spread out the loads on the bridge. Examples of it can be found everywhere in the world. Regardless, the Warren Truss has been around a while and has been very popular. His patent was more about the methodology of building rather than a “design”. James Warren patented a design in 1848 (in England), which many attribute the name “Warren Truss”. It’s exact history and origination is a little muddled, however. The Warren Truss is a very common design for both real and model bridges.
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