EL-PL 7.xx - Dlubal Software

Updated:

08/30/2010

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EL-PL 7.xx

Ultimate Limit State Design according to the Elastic-Plastic Method

With the add-on module EL-PL for RSTAB, the plastic reserves of the cross-section can be utilized according to the Elastic-Plastic design method as specified in DIN 18800 part 1: The design loadings must not exceed the limit internal forces in the fully plastic state with consideration of the interaction conditions.

Along with the interaction formulae according to DIN 18800, the design methods according to Rubin, Kindmann and Kahlmeyer are available. The design also checks the limit (c/t) ratios according to DIN 18800 part 1, table 15 and considers the respective factors a for compression parts.

Features

Full integration in RSTAB with consideration of all relevant internal forces
Interaction design according to
- DIN 18800-1:1990-11: doubly symmetric I-sections
  with uni- or biaxial bending
- DIN 4420-1:1990-12: pipes
- Rubin: doubly symmetric I- and box sections with uni- or biaxial bending
- Rubin: singly symmetric I-sections with uniaxial bending
- Kahlmeyer: singly and doubly symmetric I- and box sections with uniaxial bending
- Kindmann: all I-sections with uni- or biaxial bending
Design of section types I, T, QR, RR, RO, CHS, IS, IU, IA, TS, TO, IV, UI, Pipe, Box(A), Box(B), Pi(A), Pi(B), KB, 2I(a=0), 2UR(a=0), 2LA(a=0), ICU, ICO, IBU, IBO, SFBo, SFBu, IFBo, IFBu, ICM, KB(L)
Freely definable yield strengths, also dependent on structural thickness
Limitation of moment capacity by factor a_pl,max
Cross-section optimization with export option to RSTAB


Input All relevant RSTAB data is preset appropriately in the module. Therefore, the input is reduced to the definition of the relevant members, sets of members and actions. It is also possible to select the structural objects graphically in the RSTAB model. The already preset materials and cross-sections can always be modified. When you adjust the sections, you can take advantage of the libraries already used in RSTAB.


Design The design is carried out according to the selected approach. If the specific requirements such as section type or bending moments are not fulfilled, the interaction conditions according to Rubin are applied automatically. The design loading of general cross-sections is determined without considering the interactions as long as the design ratios of the remaining internal forces are below a user-definable value. Likewise, non-designable internal forces can be excluded from the design by specifying a threshold value.


Results The results tables are arranged according to cross-sections, members, sets of members and x-locations. For every designed location, details on the interaction are shown as e.g. full-plastic internal forces, governing (c/t) part or location of the neutral axis. The design criteria are visualized on the RSTAB model so that you can detect critical structural components immediately. In RSTAB, you have access to all tools to graphically evaluate the results graphically, such as the zoom and partial view function, the panel or the print options. If the design is not fulfilled, it is possible to optimize the cross-section: EL-PL selects the section from the same cross-section row which performs the design with the highest possible ratio. Finally, you can export the optimized sections to RSTAB to calculate the internal forces again. All results tables can be transferred to MS Excel or OpenOffice.org Calc.

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