Patch Command

• Command_Manual
  • Tcl Commands
  • Modeling_Commands
    • model
    • uniaxialMaterial
    • ndMaterial
    • frictionModel
    • section
    • geometricTransf
    • element
    • node
    • sp commands
      • fix
      • fixX
      • fixY
      • fixZ
    • mp commands
      • equalDOF
      • rigidDiaphragm
      • rigidLink
    • timeSeries
    • pattern
    • mass
    • block commands
      • block2D
      • block3D
    • region
    • rayleigh
  • Analysis Commands
    • constraints Command
    • numberer Command
    • system Command
    • test Command
    • algorithm Command
    • integrator Command
    • analysis Command
    • eigen Command
    • analyze Command
  • Output Commands
    • recorder
    • record
    • print
    • printA
    • logFile
    • RealTime_Output_Commands
  • Misc Commands
    • eleResponse Command
    • getTime Command
    • getEleTags Command
    • getNodeTags
    • loadConst Command
    • nodeCoord Command
    • nodeDisp Command
    • nodeVel Command
    • nodeAccel Command
    • nodeEigenvector Command
    • nodeBounds
    • print Command
    • remove Command
    • reset Command
    • testIter
    • testNorms
    • wipe Command
    • exit Command
  • DataBase Commands
    • Template:DataBaseCommandsMenu

---

The patch command is used to generate a number of fibers over a cross-sectional area. Currently there are two types of cross-section that fibers can be generated: quadrilateral and circular.

The following is the command to generate a quadrilateral shaped patch (the geometry of the patch is defined by four vertices: I J K L. The coordinates of each of the four vertices is specified in COUNTER CLOCKWISE sequence):

patch quad $matTag $numSubdivIJ $numSubdivJK $yI $zI $yJ $zJ $yK $zK $yL $zL

$matTag
$numSubdivIJ	number of subdivisions (fibers) in the IJ direction.
$numSubdivJK	number of subdivisions (fibers) in the JK direction.
$yI $zI	y & z-coordinates of vertex I (local coordinate system)
$yJ $zJ	y & z-coordinates of vertex J (local coordinate system)
$yK $zK	y & z-coordinates of vertex K (local coordinate system)
$yL $zL	y & z-coordinates of vertex L (local coordinate system)

---

The following is the command to generate a circular shaped patch:

patch circ $matTag $numSubdivCirc $numSubdivRad $yCenter $zCenter $intRad $extRad <$startAng $endAng>

$matTag
$numSubdivCirc	number of subdivisions (fibers) in the circumferential direction
$numSubdivRad	number of subdivisions (fibers) in the radial direction.
$yCenter $zCenter	y & z-coordinates of the center of the circle
$intRad	internal radius
$extRad	external radius
$startAng	starting angle (optional. default=0.0)
$endAng	ending angle (optional. default=360.0)

---

NOTES:

---

EXAMPLE:

patch circ $coreMatTag 8 8 0.0 0.0 0.0 $h; # define solid circular section with 64 fibers with radiues $h using $coreMatTag material

patch quad $coreMatTag 8 8 -$b -$h $b -$h $b $h -$b $h; # define core patch with 8 subdivisions within a rectange of width 2b and depth 2h

---

Code Developed by: fmk