2.1: Karamba3D Entities

Grasshopper (GH) is an object oriented, visual scripting environment. It provides items like points, curves, surfaces, . . . for geometric computing. The full range of geometric items can be inspected in the subcategory “Geometry” of the toolbar section “Params”. Karamba3D adds seven entities for building structural models:

Entity

Typology

Model

contains all the information related to a structure

Element

can be a beam, truss, shell or spring

Element Set

groups together elements in a given order, makes them accessible under a common name

Joint

defines the connectivity between neighboring elements

Load

external action which is imposed on the structure

Cross-section

defines a structural element’s geometry in section

Material

provides information regarding the physical behavior of what a cross section is made of

Support

defines how a structure connects to the ground.

Karamba3D objects behave like GH entities.

  • They can be stored in containers (see the “Params” subcategory of the “Karamba3D” toolbar).

  • When converted into text by plugging them into a panel they provide textual output regarding their fundamental properties.

Default Settings

In order to build a structural model not all of the above entities need to be present. Karamba3D assumes default settings for materials and cross sections:

  • If no material is given, Karamba3D chooses steel (S235 according to EC3 withfyk=23.5kN/cm2f_{yk} = 23.5 kN/cm^2) for all cross sections.

  • For beams the default is a circular hollow cross sections (CHS) with an outer diameter of114.4mm114.4mmand a wall thickness of 4mm4mm. The default thickness of shells amounts to 10mm10mm.