Alpaca4d

Appearance

Layer Fiber ​

A row of equally spaced fibres along a curve β€” a layer of reinforcement.

πŸ”§ Grasshopper component ​

Layer FiberAlpaca4d β–Έ MomentCurvature_Ξ²eta
Layer Fiber component
Inputs
CurveCurveThe line the fibres are spread along, in m, in the section's local yz plane.
NumberOfFibersInteger3How many fibres to space along the curve, ends included.
AreaFiberNumber2.011e-4Area of each fibre, in mΒ².
The default is one 16 mm bar.
MaterialMaterialB450CMaterial of the fibres. Defaults to ReinforcingSteel B450C.
Outputs
LayerLayerFor the Layer input of Fiber Section.

The component previews the fibres in red, on their black curve.

πŸ“ˆ When to use it ​

Use it when

  • Bars sit in a row: the tension layer of a beam, a face of a column, a curved layer in a circular section β€” the curve does not have to be straight.
  • You want to vary the bar count parametrically without moving points by hand.

Do not use it when

  • The bars are irregular β†’ Fiber Point each one.
  • You are filling an area rather than a line β†’ Patch.

Note

AreaFiber is the area of one bar, not of the layer. A layer of 5 Γ— 16 mm bars is NumberOfFibers = 5 and AreaFiber = 2.011e-4 β€” total steel 1.006e-3 mΒ².

The fibres are placed ends included, so a straight curve from cover to cover puts a bar at each corner.

πŸ”— Relation to OpenSees

The layer is expanded into individual fibres inside the enclosing section Fiber block:

tcl
fiber $yLoc $zLoc $area $matTag