Lecture 15
| Arch 324/624, Introduction to Structural Design, University
of Virginia Copyright © 1996-2009 Kirk Martini. Last Modified Fri, 13-Mar-2009 9:41 |
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Trusses
General
- We now turn attention from tools and criteria for single elements to assemblies
of elements.
- Trusses are a good place to start since they are one of the simplest form
of assembly.
- Palladio knew this.
- Triangulation is the key to trusses.
- Using triangulation, it is possible to form a stable assembly with pin
connections only.
- Rectangles require moment-resisting connections to be stable.
- The connections are more expensive to make, and the resulting moments require larger members.
Classical Truss Theory
- A set of simplifying assumptions that make it easy to analyze trusses
by hand, and to visualize how they work.
- Assume members are pin connected.
- Assume assembly is loaded at joints.
- Assume members are pin connected.
- Real structures often don't fit these ideal assumptions.
- And don't forget: Although we are dealing with 2D assemblies, it is essential
to have out-of-plane bracing and support for stability.
| Arch 324/624, Introduction to Structural Design, University
of Virginia Copyright © 1996-2009 Kirk Martini. Last Modified Fri, 13-Mar-2009 9:41 |
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of Contents |