4.16.2.3. Layer Command

layer(type, *args)

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

layer('straight', matTag, numFiber, areaFiber, *start, *end)

This command is used to construct a straight line of fibers

matTag (int)

material tag associated with this fiber (UniaxialMaterial tag for a FiberSection and NDMaterial tag for use in an NDFiberSection).

numFiber (int)

number of fibers along line

areaFiber (float)

area of each fiber

start (list (float))

y & z-coordinates of first fiber in line (local coordinate system)

end (list (float))

y & z-coordinates of last fiber in line (local coordinate system)
layer('circ', matTag,numFiber,areaFiber,*center,radius,*ang=[0.0,360.0-360/numFiber])

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

matTag (int)

material tag associated with this fiber (UniaxialMaterial tag for a FiberSection and NDMaterial tag for use in an NDFiberSection).

numFiber (int)

number of fibers along line

areaFiber (float)

area of each fiber

center (list (float))

y & z-coordinates of center of circular arc

radius (float)

radius of circlular arc

ang (list (float))

starting and ending angle (optional)
layer('rect', matTag, numFiberY, numFiberZ, areaFiber, *center, distY, distZ)

This command is used to construct a line of fibers around a rectangle with specified center coordinate, extending +/-distY/2 and +/-distZ/2 from center. If numFiberY and numFiberZ are zero, there will be four corner fibers. The total number of fibers is 4+2*numFiberY+2*numFiberZ.

matTag (int)

material tag associated with this fiber (UniaxialMaterial tag for a FiberSection and NDMaterial tag for use in an NDFiberSection).

numFiberY (int)

number of intermediate fibers on each side along Y-direction

numFiberZ (int)

number of intermediate fibers on each side along Z-direction

areaFiber (float)

area of each fiber

center (list (float))

y & z-coordinates of center of rectangle

distY (float)

height of rectangle in Y-direction

distZ (float)

width of rectangle in Z-direction