Comment on page
3.1.6: Line to Beam
Fig. 22.214.171.124 shows how the “LineToBeam”-component takes two lines as input, finds out how they connect and outputs beams as well as a set of unique points which are their end-points. Lines with end-points of identical index get automatically removed. Unless lines get removed, there is a one to one correspondence between the list of input lines and output beams.
The “LineToBeam”-component accepts straight lines, polylines and splines as geometric input. Polylines get exploded into segments. Splines are intersected according to the parameters 'ToPAng', 'ToPTol' and 'ToPMinL' (see below for their meaning) . All coordinates are in meters (or feet in case of Imperial units).
For Cross section design the buckling length assumed for the individual elements is of utmost importance. By default - when the input at "SetBkl" is 'True' - the distance between the end-points of a line, poly-line or spline forms the initial assumption for the buckling length of all thus created elements. An assumption for the buckling length is always given a negative sign but is taken as an absolute value in the design procedures. This assumption can be overridden via a "ModifyBeam"-component by the user by supplying a positive buckling length. In case that the simplified buckling length calculation done by Karamba3D (see section 3.6.8: Optimize Cross Section 🔷) leads to a larger value than the initial assumption then the larger value is applied. A User defined positive buckling length always wins over any assumptions.
The “Color”-input lets one define a color for the rendering of elements. In order to display the colors activate the “Elements”-button in sub-menu “Colors” of the “ModelView”-component. In addition the option “Cross section” of the sub-menu “Render Settings” of the “BeamView”-component needs to be on.
Fig. 126.96.36.199: The “LineToBeam”-component that turns two lines into beams
Elements can be given non-unique names via the “Id”-input . It takes a list of strings as identifiers for beams. The default value is an empty string. Each beam has a name by default: its zero based index in the model. Identifiers provide a useful means to group the beams in order to modify or display them. In case one wants to give multiple names to an element use the notation '&"id1"|"id2"|"id3"|...' or shorter '&id1|id2|id3|...'. Similar to regular expressions this assigns the identifiers 'id1', 'id2', 'id3',... to a beam.
Cross sections can be attached to elements with the “CroSec”-input. Cross section definitions via the “Assemble”-component override these settings.
A click on the “Options” submenu heading reveals additional input-options of the “LineToBeam”-component:
Beams that meet at a common point are by default connected rigidly in the structural model like they were welded together. See section 3.3.6 on how to define joints at the end of beams. The “Info” output-plug informs about the number of removed nodes and beams.
In order to be of immediate use, beams come with a number of default properties. They can be seen in the top right string-output of fig. 188.8.131.52: “active” means that a beam will be included in the structural model. The default cross section is a circular hollow profile of diameter 114mm with a wall-thickness of 4mm. The default material is steel of grade “S235” according to Eurocode 3.