Alpaca4d

Appearance

Rectangular Hollow ​

A rectangular hollow (box) cross-section, with independently specified web and flange thicknesses.

🔧 Grasshopper component ​

RectangleHollowAlpaca4d ▸ 01_Section
RectangleHollowCS component
Inputs
SecNameSectionNameText(empty)Label for the section.
WidthNumber0.30Overall width, in m.
HeightNumber0.60Overall height, in m.
WebNumber0.02Thickness of each vertical wall, in m.
TopFlangeNumber0.02Thickness of the top wall, in m.
BottomFlangeNumber0.02Thickness of the bottom wall, in m.
MaterialMaterialA Uniaxial material.
ColourColour(empty)The colour the section is drawn in when Model View colours the elements by section.
Left empty, Model View gives each section a colour of its own. Display only: the analysis never reads it.
Outputs
SectionSectionBeam section, for a ForceBeamColumn.

📈 When to use it ​

Use it when

  • The member is a square or rectangular hollow section.
  • You are modelling a box girder or a welded box column with different plate thicknesses top and bottom.

Do not use it when

🔗 Relation to OpenSees
tcl
section Elastic $secTag $E $A $Izz $Iyy $G $J $alphaY $alphaZ