1638x
004298
2020-01-07

Question

According to DIN EN 1995‑1‑1/NA, the crack factor kcr may be increased by 30% for softwood in areas that are at least 1.50 m from the timber grain plane. How is it possible to apply this in RF‑/TIMBER Pro?


Answer:
Increasing the crack factor kcr still has to be done manually, because the program does not know where the grain plane is defined. To do this, divide the member accordingly by 1.5 m from the grain plain, so that the affected areas can be designed as a separate member (see Image 01).

Two design cases are now required (File → New Case ...). In Case 1, the members within 1.5 m are selected for the design. In Case 2, it is necessary to select the members where 30% should be considered. In Case 2, the kcr value is then adjusted manually in the National Annex settings. Thus, the factor kcr is 0.65 for C24, which is entered as shown in Image 02. This way, the design is performed with the increased kcr value.