RSBUCK 7.xx - Dlubal Software

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Structural Analysis and Design Software

Steel Structures
Concrete Structures
Timber Structures

Glass Structures
Plant Engineering
Mechanical Engineering

Interfaces, Data Exchange
Dynamic Analysis

Updated:

01/31/2012

Cross-References

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Products - Overview

RSBUCK 7.xx

Stability Analysis for Frameworks

Based on the eigenvalue analysis, the RSTAB add-on module RSBUCK calculates the buckling shapes of the structure modeled in RSTAB.

The program determines for each member the structure-specific buckling lengths and loads including the respective critical load. The critical load factor for the entire structure is displayed additionally.

The RSBUCK results can be used for further stability analyses such as the flexural buckling design according to DIN EN 1993 in the add-on module STEEL EC3 or according to DIN 18800 in the add-on module KAPPA. The buckling shapes can also be used for generating equivalent imperfections with RSIMP.


Features Automatic import of structural data and boundary conditions from RSTAB Optional consideration of tension force effects Import of axial forces from RSTAB load cases or user-defined specifications for member Member by member output of buckling lengths L about weak and strong axis with corresponding buckling length coefficients b Member by member listing of standardized buckling shapes Buckling case related output of critical load factor for entire structure Graphic and animated visualization of buckling shapes on the rendered model Identification of members free of compression forces Transfer option for buckling lengths to other RSTAB design modules for equivalent member designs conforming to standards Export option for buckling shape geometry to the add-on module RSIMP for creating RSTAB imperfections Direct data export to MS Excel or OpenOffice.org Calc


Input RSBUCK is distinguished by an easy handling, a clear data arrangement and a great user friendliness. With only a few mouse clicks, you can define the number of buckling shapes to be calculated as well as the load case that you want to take into account. The structural data and the boundary conditions set in the selected load case are imported automatically. Alternatively, you can edit the imported axial forces or enter new values manually. Finally, it is possible to create further RSBUCK cases so that you can carry out several analyses each with different boundary conditions. Furthermore, for reasons of clarity in the results representation, it is possible to set the units individually in RSBUCK. In case RSTAB internal forces are not available when you start the RSBUCK module, the program calculates the required internal forces automatically before it determines the buckling values.


Calculation RSBUCK determines the most unfavorable buckling shapes of a structure. Due to the theory forming the basis of the calculation method, it is generally not possible to exclude lower eigenvalues from the analysis and determine higher eigenvalues at the same time. With RSBUCK, you can determine not more than 1000 of the most lowest eigenvalues of a structural system. By default, RSBUCK uses the average value of the axial forces occurring on the individual members to calculate the eigenvalues/critical load factors. Optionally, the module can also work with the most unfavorable axial force in the member. The determination of buckling shapes is performed by an eigenvalue analysis for the entire structure. The program uses an iterative equation solver for this determination. You only have to specify the following two values: the maximum number of iterations the break-off criterion As you can approximate an exact result as close as possible but never reach it, RSBUCK cancels the calculation process when the defined number of iteration steps has been completed. In case of a convergence problem, the break-off criterion is the limit that determines the moment when an approximate solution can be considered as an exact result. For divergence problems, there won't ever be a solution.


Results The results of the buckling analysis are displayed in clearly-arranged results tables and graphics. Furthermore, due to the integration of RSBUCK in RSTAB, you can adjust all results in detail in the printout report according to your needs. Finally, it is possible to export all tables to MS Excel or OpenOffice.org Calc or in a CSV file without any problems. All specifications required for the export are defined in a special transfer menu.

Note

You can find more information about RSBUCK here:

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