KRASTA (software)

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KRASTA
Basic data

developer Kühne BSB GmbH
Current  version 9.7.x
operating system Windows
category CAE
License Proprietary
German speaking Yes

KRASTA (short for KRAn-STAtik ) is a 3D bar statics program that is tailored to the calculation of frameworks in the areas of crane construction, plant construction, conveyor technology and temporary structures. Structures can be divided into subsystems, brought into different operating situations and calculated and evaluated within a model. Fatigue strength tests according to German and international standards are supported.

KRASTA was developed from 1973 in the conveyor technology and lifting machines department of the TH Darmstadt. A public presentation of the program took place in 1979, since then KRASTA has been used industrially. Since 1991 the program has been developed and sold by Kühne BSB GmbH, based in Darmstadt.

PAS (static linear and 2nd order theory), MOD (modal analysis) and Stab88 / NODYA (static linear, geometrically non-linear and stability) are used as computing cores. PAS and MOD are included in the scope of delivery. Stab88 or its successor Nodya is developed and sold by the "Materials Handling, Material Flow, Logistics" department at the Technical University of Munich.

KRASTA supports the languages ​​German and English.

history

In 1973, the "Conveyor Technology and Lifting Machines" department at the TH Darmstadt developed the idea of ​​creating a program for calculating cranes and similar frameworks. The development of KRASTA then starts under the leadership of Prof. Dr.-Ing. Rudolf Neugebauer. The development takes place in cooperation with partners from industry and with the support of the Association of German Mechanical and Plant Engineering (VDMA) and the Research Board of Mechanical Engineering (FKM).

KRASTA has been used industrially since 1979. In 1987 it was ported to IBM-compatible PCs with partly graphical interactive input. A fully graphically interactive version for MS Windows has been available since 1996.

Since 1991, KRASTA has been developed and marketed by Kühne BSB GmbH. In addition to KRASTA, Kühne BSB GmbH itself also offers calculation and consulting services in crane construction, conveyor technology, plant construction and for temporary structures. Here KRASTA is used as one of the most important tools. The further development of KRASTA is therefore strongly based on calculation practice.

Scope of services

General structural analysis

KRASTA models consist of nodes and bars with specific properties. Among other things, nodes can be assigned support conditions (movable, fixed or spring parameter for 3 translational and 3 rotational degrees of freedom each), members receive material, cross-section and joint conditions (joint, rigid or spring parameter for 3 translational and 3 rotational degrees of freedom at each member end) as properties . Loads or external influences are defined as load cases and, if necessary, combined or provided with a permutation logic. Internal forces and deformations are calculated for the load cases. Stresses can be determined from internal forces and cross-sectional values.

Mass falls and mass forces

Mass forces can be defined in KRASTA via mass falls and accelerations or speeds. Load-bearing components or assemblies can be adapted to the actual or estimated construction weight using mass factors. Subordinate parts and equipment (e.g. drives, electrical equipment, control stations, etc.) of the structure to be calculated can be applied as node or bar weights.

Summarized to form the total mass or the mass of independently moving assemblies, the masses can be provided with translational and rotational acceleration or with a rotational speed.

Subsystem technology and kinematics

Structures can be divided into subsystems. Subsystems can either be moved into specific operating situations using level kinematics (e.g. luffing a boom, rotating an overhead crane) or by changing the connection nodes at different points in the structure (e.g. different positions of a trolley).

Certain operational situations of the structure can be repeatedly saved and called up in the calculation model. The results can be evaluated simultaneously across all saved situations.

Masses and loads can be defined depending on the operating situation. So z. B. Lifting loads can be defined depending on the radius of a boom.

Proof of fatigue strength

KRASTA supports fatigue tests according to various standards. Depending on the standard and verification method, upper and lower voltage, stress cycles or damage to a stress curve are determined using load case patterns and operating situations. The verification is carried out for normal and / or shear stresses.

Evidence by classification in a load group or by specifying the number of load cycles:

  • AS 4100
  • DIN 15018 and DASt 011
  • DIN 22261
  • FEM 1.001
  • EN 13001-3-1
  • EN 1993-1-9 (Eurocode 3)
  • ISO 5049-1

Evidence through linear damage accumulation :

  • EN 13001-3-1
  • EN 1993-1-9 (Eurocode 3)

distribution

KRASTA is mainly used in Germany, the Netherlands and Belgium by crane and system builders, TÜVs and universities. There are individual users in the rest of Europe and Asia.

literature

  • Kühne BSB GmbH: KRASTA manual 9.6 . Darmstadt 2013

Individual evidence

  1. ↑ a b KRASTA - overview . Manufacturer's website. Retrieved June 17, 2014.
  2. ↑ a b KRASTA - story . Manufacturer's website. Retrieved June 17, 2014.
  3. ↑ NODYA . Website of the Technical University of Munich about NODYA. Retrieved June 17, 2014.
  4. ↑ KRASTA - references . Manufacturer's website. Retrieved June 18, 2014.