Interface with MS Excel/OpenOffice
In RF-/STEEL EC3, you can optimize a cross‑section automatically within the design. For this, select the corresponding cross‑section in Table 1.3 or define variable parameters for a welded cross‑section.
In terms of a further optimization or variant analysis, you can also select completely different cross-sections for the design in the add-on module as they are connected with members in the RFEM/RSTAB model. You can manually overwrite an existing cross-section in column B of Table 1.3 with a desired section. However, in the case of several cross‑sections or long descriptions such as “IU 500/250/16/10.2/200/16/0/0”, this can be time‑consuming. The MS Excel interface, which is consistently available in RFEM/RSTAB, allows you to do this in no time at all, see Figure 1.
Please note: When optimizing a cross‑section, the internal forces are not automatically recalculated with the modified cross‑sections. The user decides which sections are to be transferred to the main program for recalculation.
To transfer the cross -section to RFEM/RSTAB, right -click the corresponding cross -section in Window 1.3 - Cross -Sections, see Figure 2.
Because of the modified stiffnesses in the system, the internal forces defined by the optimized cross-sections can differ significantly.
Bastian Ackermann, M.Sc.
Mr. Ackermann provides technical support for customers of Dlubal Software and takes care of their requests.
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Calculation and Design of Two-Story Building: Analysis of Two Options (Steel-Concrete Composite Structure and Modular Construction)
SHAPE-THIN determines the effective cross-sections according to EN 1993-1-3 and EN 1993-1-5 for cold-formed sections. You can optionally check the geometric conditions for the applicability of the standard specified in EN 1993‑1‑3, Section 5.2.
The effects of local plate buckling are considered according to the method of reduced widths and the possible buckling of stiffeners (instability) is considered for stiffened sections according to EN 1993-1-3, Section 5.5.
As an option, you can perform an iterative calculation to optimize the effective cross-section.
You can display the effective cross-sections graphically.
Read more about designing cold-formed sections with SHAPE-THIN and RF-/STEEL Cold-Formed Sections in this technical article: Design of a Thin-Walled, Cold-Formed C-Section According to EN 1993-1-3.
- Are the effective length coefficients in the add-on modules for the aluminum and steel design automatically determined from the model or do I have to make adjustments?
- I design a cross-section created in the SHAPE‑THIN program by using the RF‑STEEL EC3 add-on module, but the program shows the error message "ER006 Invalid type of c/t-part for cross-section of type General." What can I do?
Is it possible to calculate American steel cross-sections?
- Where do I find the setting to specify the entered structural component as a "wall" or "slab"?
- How can I quickly model a chimney with reinforcement rings and stiffeners?
- How can I model and design general bolted connections with the surface and solid elements in RFEM?
- I get the message "Existing torsion -> no stability design possible." Why does this appear and what can I do?
- I design an asymmetric cross-section and get the message: "Non-designable: ER051) Moment about z‑axis on asymmetric cross-section, taper or set of members." Why?
- How can I consider holes in steel members?
Is it possible to model and design tapered castellated beams in RF-STEEL AISC?