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KB 000883 | Limit values for shear stresses from torsion in RF-/STEEL EC3
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Description
Very small torsional moments in the members to be designed often prevent certain design formats. In order to neglect them and still perform the designs, you can define a limit value in RF-/STEEL EC3 from which torsional shear stresses are taken into account.
Keywords
Dlubal Knowledge Base Limit value Torsion shear stresses Stability analysis Warping torsion Dlubal KB Knowledge Base Technical Contribution
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Limit values for shear stresses from torsion in RF-/STEEL EC3
Very small torsional moments in the members to be designed often prevent certain design formats.
SHAPE-THIN | Cold-Formed Sections
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.
- When checking the calculation, the following message appears: "Error No. 16 when generating the FE mesh. Two or more nodes have the same coordinates."
- I cannot see any members if the RF-/STEEL EC3 add-on module is selected as a "load case," why?
- To which axes refer the support rotations and support eccentricities in RF‑/STEEL EC3 Warping Torsion?
- What does the load application point in RF-/STEEL EC3 Warping Torsion refer to?
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What are the options in RFEM or RSTAB for determining the ideal elastic critical moment for any cross-sections and systems/loads?
Is it also possible to design flat steel (brackets, flat steel stringers of staircases)?
- SHAPE‑THIN calculates a very small shear area. Why?
- When calculating a connection with the FRAME JOINT Pro add -on module, a message appears saying that the value is outside the allowable range (prev. Value: 108, min. Value 100, max. Value 100). What does this message mean?
- I have a trapezoidal roof structure that is supported by beams. However, the moments on the beams are smaller than they should be. What could be the reason for this?
- Why are some load cases displayed in red in RF-STEEL EC3?
- Why are the equivalent member designs grayed out in the Stability tab when activating the plastic designs by using the partial internal force method (RF‑/STEEL Plasticity)?
