Rod (statics)

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Structural bars of a steel structure, in this case as a pendulum supports running

A rod is the simplest beam in a structure such as B. a truss or a frame . In contrast to a beam , a rod is very thin compared to its length. The member axis represents the gravity axis of a component. It can transfer normal forces, in three dimensions also torsion . A structure made of bars is calculated using the bar statics ; a structure made of beams according to the beam statics .

In addition to their length l, bars have, among other things, a tensile stiffness EA . These properties are sufficient to be expected. If the relationships between EA of the individual bars are known, the bar forces can be calculated using the linear theory of elasticity. Since materials generally behave in a plastic and viscous manner, the utilization of statically indeterminate systems also influences the load-bearing behavior, see e.g. B. Plastic hinge .

A bar can be loaded at any point.

A structure made of bars can be statically determined or statically indeterminate. There are two-dimensional and three-dimensional bar structures.

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