Layer Command

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The layer command is used to generate a number of fibers along a line or a circular arc.

This command is used to construct a straight line of fibers:

layer straight $matTag $numFiber $areaFiber $yStart $zStart $yEnd $zEnd

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$matTag	material tag of previously created material (UniaxialMaterial tag for a FiberSection or NDMaterial tag for use in an NDFiberSection)
$numFibers	number of fibers along line
$areaFiber	area of each fiber
$yStart $zEnd	y and z-coordinates of first fiber in line (local coordinate system)
$yEnd $zEnd	y and z-coordinates of last fiber in line (local coordinate system)

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This command is used to construct a line of fibers along a circular arc:

layer circ $matTag $numFiber $areaFiber $yCenter $zCenter $radius <$startAng $endAng>

$matTag	material tag of previously created material (UniaxialMaterial tag for a FiberSection or NDMaterial tag for use in an NDFiberSection)
$numFiber	number of fibers along arc
$areaFiber	area of each fiber
$yCenter $zCenter	y and z-coordinates of center of circular arc
$radius	radius of circular arc
$startAng	starting angle (optional, default = 0.0)
$endAng	ending angle (optional, default = 360.0 - 360/$numFiber)

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NOTES:

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EXAMPLE:

layer straight $steelMatTag 10 0.11 -b -h b -h; # define layer of 10 bars with area 0.11 at bottom of section of width 2b by 2h

layer circ $steelMatTag 10 0.11 0.0 0.0 $h 0 180; # define layer of 10 bars with area 0.11 uniformly distributed along semi-circle centered at (0,0) with radius h

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Code Developed by: Remo M. De Souza