Karamba3D 2.2.0

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1: Introduction

2: Getting Started

3: In Depth Component Reference

Troubleshooting

2.4: Quick Component Reference

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:

Container for cross section objects

Container for finite elements

Container for ordered groups of elements

Container for connectivity conditions between elements

Container for load objects

Container for materials

Container for models

Container for supports

Model

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

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

Decomposes a model into its components.

Changes the model's nodal positions.

Returns groups of interconnected lines of the model.

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

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.

Creates beams with default properties from a given connectivity diagram.

Creates beams with default properties from given node indexes.

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

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

**Modify Beam (default)**

Modifies beams only

**Modify Shell**

Modifies shells only

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

Decomposes elements into their components.

Puts beams designated by their beam identifier into a group.

Decomposes elements into their components:

**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.

**Shell**

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

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.

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.

Multi-component for defining loads:

**Gravity (default)**

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

**Point-Load**

Creates point loads at points of given index or position.

**Imperfection-Load**

Defines imperfections for beams under normal forces .

**Initial Strain-Load**

Sets initial axial strains on beams.

**Temperature-Load**

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

**Line-Load on Element**

Creates a uniformly distributed load on a beam.

**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.

**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.

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

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

Multi-component for creating cross sections:

**Box-Profile (default)**

Creates rectangular, trapezoid and triangular hollow cross sections.

**Circular Hollow Profile**

Creates circular hollow cross sections.

**I-Profile**

Creates I-shaped cross sections.

**Shell Const**

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

**Shell Var**

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

**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.

**ShellRC Std Var**

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

**Spring-Cross Section**

Defines the spring stiffness of an element.

**Trapezoid-Profile**

Creates filled rectangular, trapezoid and triangular cross sections.

Retrieves properties of a cross section.

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

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

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

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

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

**Modify Beam Cross Section (default) 🔷**

Modifies beam cross sections only.

**Modify Shell Cross Section 🔷**

Modifies shell cross sections only.

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

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.

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

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

Reads cross section data from a csv-file.

Sets the characteristic parameters of an isotropic or orthotropic material.

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

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

Outputs the physical properties of a material.

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

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

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.

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

Calculates the buckling-modes and buckling load-factors of the given model under normal **f**orces .

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

Calculates the natural vibrations of the given model.

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

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

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

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

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

Results

Lets you inspect the general properties of the model.

Retrieves deformation energies of the elements of the model.

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

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

Returns reaction forces and moments at supports.

Multi-component that returns the utilization of elements. “1” means 100%:

**Utilization of Beams (default) 🔷**

**Utilization of Shells 🔷**

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

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

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

Retrieves section forces along beams and trusses.

Retrieves resultant section forces of beams.

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

Multi-component for generating line results on shells:

**Force Flow (default)**

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

**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.

**PrincMoment**

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

**PrincStress**

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

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

**PrincStress (default)**

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

**PrincForces**

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

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

Expor**t** 🔷

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

Utilities

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

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

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.

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

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

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

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

Returns the points where given lines intersect given meshes.

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.

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

Eliminates identical lines.

Eliminates identical points.

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

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

Applies mappings (like Simple Stitch) to a model.

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

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

**Simple Stitch (default) 🔷**

Connects beam sets by a preset number of elements.

**Stacked Stitch 🔷**

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

**Proximity Stitch 🔷**

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

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

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

Last modified 1yr ago