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Why are the values of the Elementary Design Magnitudes different since SCIA18?

While using the new Post Processing Environment – v17 – only the relevant design moments are drawn per surface. In SCIA Engineer 17 the relevant bending moments – for both upper and lower surface – were marked with positive value. However, the convention of the Elementary Design Magnitudes was modified for the Post Processing Environment v17 since SCIA Engineer 18. Since this version, all relevant bending moments at the upper surface will be shown by a negative value, while bending moments at the bottom surface will be shown by a positive value. The following pictures provided a graphical representation of the differences for both versions of SCIA Engineer while using the Post Processing Environment v17.

 

Displaying mxD+ in Post Processing Environment v17 – SCIA Engineer 17:

 

 

Displaying mxD+ in Post Processing Environment v17 – SCIA Engineer 18:

 

 

Displaying mxD- in Post Processing Environment v17 – SCIA Engineer 17:

 

 

Displaying mxD- in Post Processing Environment v17 – SCIA Engineer 18:

 

 

In Post Processing Environment v16 and older both positive and negative values were displayed for the Elementary Design Magnitudes. However, only the positive bending moments needed to be taken into account in order to determine the reinforcement of the slab.

It might be possible that the generated results are not the same in the engineering report as the results shown in the model space of SCIA Engineer 18. This may be caused due to an incorrect selection of the result items while composing the report. When looking at the following picture, the option “2D member – Internal forces” only provides positive values for the Elementary Design Magnitude mxD+. This is caused due to the selection of the item “Results” which generates results by using the old Post Processing Environment, meaning that only positive bending moments are relevant. The second option “2D internal forces”, which can be selected by using the available item “Results v17”, provides a negative value for mxD+. This item generates the results by using the new Post Processing Environment v17 and the modified convention.

 

 

General remark: it is very important that the user is aware of the modification of the convention as well as the difference between the options “Results” and “Results v17” in the Engineering Report. The option “Results” should only be used while working the Post Processing Environment v16 and older. When using the Post Processing Environment v17, the item “Results v17” should be used. It might as well be necessary to check report templates, which were created before the release of SCIA Engineer 18, using the engineering report item “Results”.