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Frequently Asked Questions (FAQ)
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AnswerIf you only want to transfer the wind loads on the gable over the columns and not via the girder, you can deactivate it in the settings of the load generator by using the setting "Correction of generated loads" (see Figure 1).
AnswerThe following national annexes can be used for the load generator for wind loads according to EN 1991-1-4:CEN European UnionBDS BulgariaBS United KingdomCSN Czech RepublicCYS CyprusDIN GermanyDK DenmarkIS IrelandLST LithuaniaNBU BelgiumNEN The NetherlandsNF FranceNP PortugalNS NorwayÖNORM AustriaPN PolandSFS FinlandS IS SloveniaSR RomaniaSS SingaporeSS SwedenSTN SlovakiaCPM BelarusUNE SpainUNIVERSITY ItalyFurthermore, the snow loads can also be generated according to DIN 1055-4, CTE DB-SE-AE and ASCE / SEI 7-16.
When selecting the nodes for basic geometry and roof geometry, always make sure that the nodes have the same layout as in the graphic (see Figure 1), that is:
- Node A via node I
- Node B over node J
- Node C over node K
- Node D via node L
If the load generator is used for simple and fast generation of wind loads, for example, for a hall with roof overhangs, it is possible to consider the load on the roof overhang. The data are entered separately for the base geometry of the building (without the roof overhang) and the roof geometry (with the roof overhang). The input dialog box is shown in Figure 01.
The program determines the roof overhang from the difference and applies the load accordingly (see Figure 02).
The load generators create a rectangular building shape. The following roof shapes are available for the roof geometry:
- Flat roof
- Monopitch roof
- Duopitch roof
In the case of different building or roof shapes, you can apply the loads manually using the tool "Generate Loads → From Area Load on Members via Plane." The load value must be determined manually.
The prerequisite for using both generators for wind and snow load are that you are working with the 3D model type. For a 2D model type, the program does not have the corresponding geometrical parameters.
The model type is set in the general data of the model. The corresponding dialog box can be opened by right-clicking "Model Data" and selecting the "General Data" shortcut menu option in Project Navigator - Data (see Figure).
If changing the model type, it may be necessary to adjust the modeling (supports, joints).
In RFEM/RSTAB, there are various load generators available under "Tools → Generate Loads" that you can use to generate snow and wind loads according to ASCE, EN, DIN, and CTE (see Figure).
For models that do not comply with the preset standard concept, you can create load specification by using the regular loads (for example, member loads from surface loads).
For this, you can use the load type of "Free Variable Load." It allows you to define a load that acts variably along the perimeter, when specifying the rotation axis. Also, it is possible to separate the perimeter in several segments.
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