![]() It’s also important to note that in Pratt Truss Design, and most Truss design for that matter, is that the members have their end fixities set to pinned. Pratt Trusses are most closely related to the Howe Truss, where the diagonal members are in the opposite direction (causing an inverse compression/tension behavior in the members). This type of truss is most appropriate for horizontal spans, where the force is predominantly in the vertical direction. This has a few effects – it reduces the cost of the structure due to more efficient members, reduces the self-weight, and eases the constructability of the structure. This simplifies and produces a more efficient design since the steel in the diagonal members (in tension) can be reduced. The vertical members are in compression, whilst the diagonal members are in tension. Here’s the list of common types of trusses:Ī Pratt Truss has been used over the past two centuries as an effective truss method. In this article, we’ll look at the various types of truss bridges and how they can help your design. Source: Roof Truss Calculator Types of TrussesĪn appropriate truss type should be chosen for the design and construction to maximise the structure’s efficiency (which is often measured in the amount of material used or labour). ![]() This means less material can be used, and the system as a whole is more efficient, as the force is distributed among a number of members. This is because the internal loads of the members are induced axially (in the direction of the member) in the form of compression or tension. ![]() When designed correctly, trusses are an efficient way to span long distances whilst minimizing the amount of material used.
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