Yes, this is easily possible.
Modelling the tapered Beam
To create a tapered beam, select, for example, the distribution type Linear in the Cross-sections tab of the Edit Member dialog. This allows you to assign different cross-sections to the start and end of the member.
Prerequisite: Interpolability of the Cross-sections
In order for RFEM to correctly calculate the variation between the cross-sections, they must be interpolable. This is the case under the following conditions:
- Number and location of the stress points: The cross-sections must have the same number of stress points, and their relative positions must correspond.
- Angular tolerance: The maximum angular difference between the cross-section parts may be at most 0.1 rad (approx. 5.73°).
Recommended Modelling with RSECTION
Parametrically created cross-sections from RSECTION 1 are generally always interpolable, which is why the following procedure is recommended:
- 1. Create a parametric cross-section in RSECTION.
- 2. Import the cross-section into RFEM 6.
- 3. Create a variant: Save the cross-section with modified parameters (e.g. greater web height for the haunch).
- 4. Assignment: Use these two variants as the start and end cross-sections for the tapered beam.
You can also find detailed instructions on this in the webinar:
Modellierung parametrischer Querschnitte in RSECTION 1 und Nutzung in RFEM 6
With this modelling variant, it is also possible to model practical tapered beams such as this one:
Design
After modelling, the tapered beam can be designed using the Steel Design add-on.
Stability verifications according to Eurocode 3
For tapered members, the following methods are available in accordance with EN 1993-1-1:
- General method according to Section 6.3.4.
- Equivalent member imperfections method (considering second-order theory and warping torsion).
Additional Connection Design
In addition, the transition from the tapered girder to the column can be realistically modelled and structurally designed using the Steel Joints add-on.
Expression log for FAQ 005805: Modeling and design of haunched beams
