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Warren Trusses are commonly used in railway bridges. But why is that? Why is in some designs the Warren Truss favoured over the Pratt or Howe Truss? To get an answer to those questions, we need to understand the structural system and how the loads travel through its different members.
The Warren Truss is a very common design for both real and model bridges. It’s exact history and origination is a little muddled, however. James Warren patented a design in 1848 (in England), which many attribute the name “Warren Truss”.
Warren and Monzani’s patent stated, The specification of this invention exhibits four different modes of building bridges, which it is stated may, with some slight modifications, be applied to the construction of aqueducts and roofing.
In this informative step-by-step guide, I will take you through the procedure done by me and my team in order to develop an effective and cost efficient Popsicle stick bridge using a warren truss pattern.
Riveted Pratt Pony Truss-American Bridge Company Above, detailed drawings of a 79'-2" Fish-bellied Pratt pony span. Above, 60 foot Warren pony span with stress analysis.
In this section it will be analyzed a simple Warren truss created with five equilateral triangles, using the Method of Joints (5). The analysis for isosceles triangles will be similar. The analysis for a structure with more triangular elements will be also similar. Vertical downward forces are applied on truss nodes.
A “truss” is what you see when you look at a truss bridge from one of its sides. A truss is typically made up of a lot of triangles, but some uncommon truss designs don’t have any. The purpose of a truss is to help a bridge support a load (car, train, person) from any point along the span of the bridge.