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Frequently Asked Questions (FAQ)
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AnswerIn most cases, the tolerances are insufficiently defined in the settings for the load generation (see Figure 1). You can recognize the relevant members very quickly, because they are not selected in the preview of the load plane with the selected members by default. This is because the relevant members lie outside the plane. Thus, further adjustments in the tolerance settings of the area load plane are required.
AnswerCoating loads, for Generated from ice loads, coatings, etc. as a member load. To access the function, select the menu entry "Tools → Generate Loads → From Coating ..." in the menu. For this, you only have to specify the thickness and the specific weight of the coating.
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 IrelandSHIFT LithuaniaNBU BelgiumNEN NetherlandsNF FranceNP PortugalNS NorwayÖNORM AustriaPN PolandSFS FinlandSIST SloveniaSR RomaniaSS SingaporeSS SwedenSTN SlovakiaCPM BelarusUN SpainUNI ItalyIn addition, the snow loads can also be generated according to DIN 1055-4, CTE DB-SE-AE, and ASCE / SEI 7-16.
AnswerThe following national annexes can be used for the load generator for snow loads according to EN 1991-1-3:CEN European UnionBDS BulgariaBS United KingdomCSN Czech RepublicCYS CyprusDIN GermanyDK DenmarkIS IrelandLST LithuaniaLU LuxembourgNBU BelgiumNEN The NetherlandsNF FranceNP PortugalNS NorwayÖNORM AustriaPN PolandSFS FinlandS IS SloveniaSR RomaniaSS SwedenSTN SlovakiaCPM BelarusUNE SpainUNIVERSITY ItalyFurthermore, the snow loads can also be generated according to DIN 1055, CTE DB-SE-AE and ASCE / SEI 7-16.
AnswerThe most convenient and fastest solution is to copy a load case to the next load case. If already generated loads have been created for several load areas in a load case (see Figure 1), all loads are transferred to the next load case during copying (see Figure 2). Subsequently, only the load values of the generated loads have to be adapted to the respective load case.This method is particularly useful for plane structures whose load type remains the same.
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
AnswerAlthough the implemented tool for generating loads may seem simple at first glance, the approach used in the background is quite complex.So that linearly variable surface loads can also be converted into linearly variable member loads, the option Detail for the correction of generated loads "After moments equilibrium of total load and generated member loads" is preset.For example, if there is a rectangular cell but there are only 3 boundary members, the load must be distributed in such a way that the resulting moment from the member loads with the respective lever arms to the centroid of the cell is zero.As a result, negative values are determined in the corners when the loading is positive.If this effect is not desired, the correction of the generated load can be deactivated or set to "None." See the Manual Manual, Section 11.8
AnswerWith the load generator it is not yet possible to generate the loads for open buildings.You could generate the loads for a closed hall and then manually fill in the missing loads.For free-standing roofs there are other assumptions according to the standard, which are not yet covered in the load generator. There is already an interesting article on the wind load on a freestanding roof on our website.
For example, if you have a grid with different grid spacing in areas, it is not suitable to apply the load generator with the defined area load plane only. The load would otherwise be determined according to the size of the area load plane and applied to all members (except the boundary members) with the same load value (see Figure, the top part).
However, if the area load is divided into several sections (dialog box section 'Boundary of the Area Load Plane'), the load is distributed correctly. This is shown on the bottom part of the figure.
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).
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