Occasionally it might be necessary to change some of the properties of the materials in a FAGUS model. It might be the case that, while testing at the building site, a different characteristic resistance of concrete is found, that due to the requirements of the aggregates used in the dosage, the elastic modulus has to be changed, etc.
It is important to know which property modifications affect the calculations of FAGUS and which ones affect the calculations of other programs in the CUBUS package, like STATIK or CEDRUS.
If we open a FAGUS file and go to Options>Materials, the list of used materials for the implementation of our model’s section will appear.
In the table we can see some information on the E and the G modulus, the density and the Poisson coefficient. Double-click on one of the materials to open the edit box for these properties.
The properties on this box are not the ones used by FAGUS to carry out the analysis. The value of E is used by STATIK and the value of G is used by CEDRUS.
For the properties of the materials to be considered by FAGUS, what are known by ‘Material classes’ have to be edited. Clicking on this icon:
We will access the material classes edit table:
It can be seen that some of the rows are in grey and others in black. The grey rows are not editable because those are norm materials, which means that it is not possible to use concrete C35/45 with its properties not being the ones specified by the norm. That is why if we want to define a new material that can adapt to the parameters that we want to enter, we must create a new class of material and specify those parameters on its row.
In conclusion, if we want to modify any material property for an analysis in FAGUS, the value of that property must not be changed in the ‘Edit material’ box. Instead, a new material class must be created with the desired properties.
All this information is also available on the FAGUS online course.