truss analysis - Lecture 18 Trusses A truss is an...

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Lecture 18 - Page 1 of 14 Lecture 18 – Trusses A truss is an assemblage of members making triangles.
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Lecture 18 - Page 2 of 14
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Lecture 18 - Page 3 of 14 A triangle is a very stable (i.e., resistant to deflection) shape, much more stable than a rectangular shape as shown below. The simplest truss imaginable would look like the following: This truss can be further split into additional triangles, with members added to resist applied loads: Load Load Load Load Load Load 1 Load Not stable Stable Load 1 triangle 1 2 2 triangles 4 triangles Load
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Lecture 18 - Page 4 of 14 A truss can be shaped to fit almost any profile as shown below: Load Load Load Load Load Load Original profile Trussed profile (8 triangles) Load Load Original profile Trussed profile (8 triangles) Top chord members Bottom chord members Diagonal members
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Lecture 18 - Page 5 of 14 Advantages of trusses : Can span very long distances (i.e., stadium roof frames are always trusses) Can pass utilities thru the members Light weight Can use small individual members Disadvantages of trusses : Labor intensive to build Can feel “bouncy” (i.e., susceptible to vibration) Needs lateral bracing Difficult to modify Difficult to fireproof “Idealized” Truss Assumptions : An “idealized” truss has the following characteristics: 1) All joints are pinned. A joint is the intersection of the centroid of the members. 2) All truss members act in either compression or tension ONLY.
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truss analysis - Lecture 18 Trusses A truss is an...

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