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The FiberSection object is composed of Fiber objects.
A fiber section has a general geometric configuration formed by subregions of simpler, regular shapes (e.g. quadrilateral, circular and triangular regions) called patches. In addition, layers of reinforcement bars can be specified. The subcommands patch and layer (Straight Layer Command, Circular Layer Command) are used to define the discretization of the section into fibers. Individual fibers, however, can also be defined using the fiber command (During generation, the Fiber objects are associated with uniaxialMaterial objects, which enforce Bernoulli beam assumptions.
The geometric parameters are defined with respect to a planar local coordinate system (y,z). See figures.
section Fiber $secTag {
fiber <fiber arguments>
patch <patch arguments>
layer <layer arguments>
}
An example fiber section is shown in the Figure.
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