2.4: Quick Component Reference

License

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License

Returns the program version, license information and can be used to manage the license file.

Params

Karamba3D introduces seven new classes for defining structural models and corresponding containers:

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Cross-section

Container for cross section objects

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Element

Container for finite elements

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Element Set

Container for ordered groups of elements

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Joint

Container for connectivity conditions between elements

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Load

Container for load objects

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Material

Container for materials

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Model

Container for models

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Support

Container for supports

Model

This subcategory contains components for assembling a model, converting geometry into finite elements and defining support conditions.

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Assemble Model

Creates a finite element model by collecting given entities (points, beams, shells, supports, loads, cross sections, materials, . . . ).

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Disassemble Model

Decomposes a model into its components.

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Modify Model

Changes the model's nodal positions.

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Connected Parts

Returns groups of interconnected lines of the model.

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Activate Element

Activates the elements of a model according to the activation list. Uses the soft kill approach for inactive elements.

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Line to Beam

Creates beams with default properties from given lines. Lines that meet at a common point result by default in rigidly connected elements. Karamba3D assumes input to be in meter or feet.

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Connectivity to Beam

Creates beams with default properties from a given connectivity diagram.

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Index to Beam

Creates beams with default properties from given node indexes.

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Mesh to Shell

Creates shells with default properties from given meshes. Quad faces are split to triangles.

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Modify Element

Multi-component for modifying elements. Works either directly on an element or indirectly as an autonomous agent:

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  • Modify Beam (default)

Modifies beams only

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  • Modify Shell

Modifies shells only

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Point-Mass

Attaches a point mass to a node of given index or position. Does not result in additional weight, only translational inertia.

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Disassemble Element

Decomposes elements into their components.

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Make Beam-Set πŸ”·

Puts beams designated by their beam identifier into a group.

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Orientate Elem

Decomposes elements into their components:

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  • Beam (default)

Sets the local Z-axis of beams according to a given vector and adds a rotation angle DAlpha about the longitudinal axis. Flips beam direction according to a given x-vector.

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  • Shell

Sets the local X- and Z-orientation using global coordinates.

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Select Element

Selects elements according to a given identifier and puts all incoming elements in two groups: selected or rejected. The identifier may be the element index, name or a regular expression.

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Support

Creates supports at nodes of given node-indexes or node-coordinates. Lets you select translations/rotations which should be zero and the support orientation with respect to the global or a local coordinate system.

Load

The components in this subcategory let one define and manipulate external actions which impact a structure.

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Loads

Multi-component for defining loads:

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  • Gravity (default)

Creates gravity from a specified direction vector for given load-cases.

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  • Point-Load

Creates point loads at points of given index or position.

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  • Imperfection-Load

Defines imperfections for beams under normal forces .

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  • Initial Strain-Load

Sets initial axial strains on beams.

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  • Temperature-Load

Imposes a temperature difference on an element with respect to its initial temperature at construction.

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  • Line-Load on Element

Creates a uniformly distributed load on a beam.

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  • MeshLoad Const

Creates approximately equivalent point- and line-loads from a constant surface load on a mesh. The constant surface load is defined by one vector.

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  • MeshLoad Var

Creates approximately equivalent point- and line-loads from a variable surface load on a mesh. The variable surface load is defined by one vector for each mesh face. The longest list principle applies when the mesh-faces outnumber the load-vectors.

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Disassemble Mesh Load

Splits a mesh-load into corresponding line- and point-loads

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Prescribed Displacement

Prescribes displacements at nodes of given node-indexes or node-coordinates. Select translations or rotations which should be prescribed. For load-cases with no displacements prescribed this will create a support.

Cross Section

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Cross Sections

Multi-component for creating cross sections:

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  • Box-Profile (default)

Creates rectangular, trapezoid and triangular hollow cross sections.

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  • Circular Hollow Profile

Creates circular hollow cross sections.

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  • I-Profile

Creates I-shaped cross sections.

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  • Shell Const

Lets you set the height and material of a shell with constant cross section.

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  • Shell Var

Lets you set the height and material of each face of a shell.

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  • ShellRC Std Const

A standard reinforced concrete cross section consists of four layers of orthogonal reinforcement. This component allows to define such a cross section which is constant throughout a shell.

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  • ShellRC Std Var

Same as above, lets one set the reinforced concrete cross section properties for each shell face separately.

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  • Spring-Cross Section

Defines the spring stiffness of an element.

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  • Trapezoid-Profile

Creates filled rectangular, trapezoid and triangular cross sections.

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Disassemble Cross Section πŸ”·

Retrieves properties of a cross section.

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Beam-Joint Agent πŸ”·

Crawls around in the model and adds joints to beams on the basis of geometric relations. Is of type cross section.

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Beam-Joints πŸ”·

Adds hinges at the end-points of beams. Is of type cross sections.

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Eccentricity on Beam πŸ”·

Sets the eccentricity of a cross section relative to the element axis in global coordinates.

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Eccentricity on Cross Section πŸ”·

Sets the eccentricity of a cross section relative to the element axis in local beam coordinates.

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Modify Cross Section πŸ”·

Multi-component for modifying cross sections. Works either directly on a cross section object or indirectly as an autonomous agent:

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  • Modify Beam Cross Section (default) πŸ”·

Modifies beam cross sections only.

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  • Modify Shell Cross Section πŸ”·

Modifies shell cross sections only.

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Cross Section Range Selector

Lets you select cross sections by country, shape, family or maximum depth or width.

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Cross Section Matcher

Returns for a cross section the best fitting cross section contained in a given list. The matched cross section is equal or better in all mechanical aspects at minimum weight.

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Cross Section Selector

Lets you select cross sections by name, regular expression or index from a list of cross sections.

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Generate Cross Section Table

Converts a list of cross sections into a string which can be streamed as a csv-file and used as a cross section table.

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Read Cross Section Table from File

Reads cross section data from a csv-file.

Material

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Material Properties

Sets the characteristic parameters of an isotropic or orthotropic material.

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Material Selection

Lets you select a material by name, regular expression or index from a list of materials.

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Read Material Table from File

Reads a list of materials from a table given in csv-format.

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Disassemble Material πŸ”·

Outputs the physical properties of a material.

Algorithms

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Analyze

Calculates the deflections of a given model using first order theory.

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AnalyzeThII πŸ”·

Calculates the deflections of a given model including the effect of axial or in-plane forces.

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Analyze Nonlinear WIP

Handles calculations involving large deformations. Is work in progress: the speed of convergence will be improved in future releases. Currently it works best for beams, but can also handle shell structures.

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Large Deformation Analysis

Does an incremental geometrically non-linear analysis for loads in load case zero. Return displacements only, no stresses of cross section forces.

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Buckling Modes πŸ”·

Calculates the buckling-modes and buckling load-factors of the given model under normal forces .

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Eigen Modes

Calculates the eigenmodes of the given model according to the special eigenvalue problem.

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Natural Vibrations

Calculates the natural vibrations of the given model.

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Optimize Cross Section πŸ”·

Iteratively selects optimum cross sections for beams, trusses and shells.

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BESO for Beams

Optimizes the topology of beams in a structure by using Bi-directional Evolutionary Structural Optimization.

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BESO for Shells

Optimizes the topology of shells in a structure by using Bi-directional Evolutionary Structural Optimization.

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Optimize Reinforcement πŸ”·

Performs reinforcement design for shells. It uses linear elastic cross section forces and the assumption of zero tensile concrete strength for determining reinforcement quantities.

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Tension/Compression Eliminator πŸ”·

Removes beams or trusses under axial tension or compression. By default compression members will be removed.

Results

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Model View

Lets you inspect the general properties of the model.

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Deformation-Energy

Retrieves deformation energies of the elements of the model.

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Nodal Displacements

Returns nodal displacements: translations in global x-, y-, and z-direction; rotations about the global x-, y- and z-axis.

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Principal Strains Approximation

Approximates the principal strain directions from the model deformation at arbitrary points.

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Reaction Forces πŸ”·

Returns reaction forces and moments at supports.

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Utilization of Elements πŸ”·

Multi-component that returns the utilization of elements. β€œ1” means 100%:

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  • Utilization of Beams (default) πŸ”·

The utilization of beams is calculated according to EC3 (see section A.4).

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  • Utilization of Shells πŸ”·

Returns the maximum Van Mises stress in each face of the shell.

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Beam View

Lets you inspect beam properties: section forces, cross sections, displacement, utilization and stresses. Is to be plugged into the definition after the β€œModelView”-component.

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Beam Displacements πŸ”·

Returns displacements along elements: translations in global x-, y-, and z-direction; rotations about the global x-, y- and z-axis.

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Beam Forces

Retrieves section forces along beams and trusses.

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Beam Resultant Section Forces

Retrieves resultant section forces of beams.

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Shell View

Lets you inspect shell properties: displacement, utilization, principal stresses and Van Mises stress. Is to be plugged into the definition after the β€œModelView”-component.

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Line Results on Shells

Multi-component for generating line results on shells:

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  • Force Flow (default)

Computes flow lines for forces in given direction at user defined positions.

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  • Isolines

Creates lines that connect points of same value for selected shell results (e.g. principal stresses, displacement, utilization, cross section thickness) at user defined positions. Also returns values and can thus be used for probing the shell state.

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  • PrincMoment

Returns the principal moment lines that originate from user defined points on shells.

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  • PrincStress

Outputs the principal stress directions in the center of each shell element.

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Results Vectors on Shells

Multi-component for generating vector results in each element of a shell:

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  • PrincStress (default)

Outputs the values of first and second principal stress on a given layer in the center of each shell element.

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  • PrincForces

Outputs the first and second principal normal forces and moments in the center of each shell face as vectors.

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Shell forces

Outputs the values of the local or principal normal forces and moments in the center of each shell element.

Export πŸ”·

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Export Model to RStab πŸ”·

Exports a model to RStab5, RStab6, RStab7, RStab8 or Robot by creating a DStV-file.

Utilities

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Closest Points

Connects each node of one set to a given number of nearest neighbor nodes or neighbors within a specified distance of another set.

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Closest Points Multi-dimensional

Performs a multidimensional nearest neighbor search on two sets of vectors.

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Cull Curves

Inputs a data tree of straight lines and thins them out so that no lines in different branches are closer than a given limit distance.

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Detect Collisions

Counts the number of intersections between the model and a given mesh.

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Get Cells from Lines

Creates closed cells from a graph and vertices on a user supplied plane.

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Line-Line Intersection

Intersects given lines and returns resulting end-points and pieces.

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Local Vector

Transforms a vector from the global to a local coordinate system given by a plane.

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Line-Mesh Intersection πŸ”·

Returns the points where given lines intersect given meshes.

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Mesh Breps

Takes multiple breps and generates a unified mesh from them. The algorithm takes account of common edges and insertion points. This lets one define positions for supports or point-loads on shells.

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Principal States Transformation πŸ”·

Transforms given principal vectors of stresses, moments or in-plane forces to an arbitrary direction.

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Remove Duplicate Lines

Eliminates identical lines.

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Remove Duplicate Points

Eliminates identical points.

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Simplify Model

Changes a model by straightening the the connecting elements between nodes that connect to more than two neighbor nodes.

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Element Felting πŸ”·

Felts elements of a model by connecting them at their mutual closest points.

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Mapper πŸ”·

Applies mappings (like Simple Stitch) to a model.

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Interpolate Shapes πŸ”·

Interpolates between a base geometry (0.0) and given shape(s) (1.0).

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Stitch πŸ”·

Multi-component for defining modes of connection between sets of beams:

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  • Simple Stitch (default) πŸ”·

Connects beam sets by a preset number of elements.

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  • Stacked Stitch πŸ”·

Connects beam sets by a preset number of elements that do not intersect each other.

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  • Proximity Stitch πŸ”·

Connects beam sets by a preset number of elements whose maximum inclination can be controlled via min/max offset-limits from their starting point.

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User Iso-Lines

Creates iso-lines on a model based on user supplied nodal values.

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User Stream-Lines

Creates stream-lines on a model based on user supplied vectors at the nodes.