RF-/LIMITS Version 5/8

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RF-/LIMITS Version 5/8

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2.3 Load Duration Class

This input window appears only if an analysis according to EN 1995-1-1 [2] or DIN 1052 [2] has been set in module window 1.1 General Data. You define the load duration of the loads in order to determine the climatic conditions for the limit checks.

Figure 2.12 Module window 1.3 Load Duration Class

The table column lists all actions that have been selected for the limit checks in module window 1.1 General Data. In case of combinations, included load cases are also displayed.

LC/CO/RC description

The load case descriptions make the classification easier.

LC Type

This table column shows the action types of the load cases as they were defined in RFEM or RSTAB during their creation. They form the basis for the settings in the next table column.

Load Duration LDC

The limit checks require the assignment of loads and their superpositions to particular load duration classes. For load cases you can change the load duration with the list shown on the left: Click into a table cell in column C. The button will be enabled. In case of unambiguous load and result combinations, RF-/LIMITS carries out the classification automatically taking intoaccount the respective governing action.

The load duration class LDC is required for the determination of the modification factor kmod. The factor is also considered for the material stiffness.

If an automatic combination of the actions was set in RFEM or RSTAB, the load duration classes are automatically taken into account according to the specifications in RFEM or RSTAB. Thus, a redefinition in RF-/LIMITS is not necessary. However, it is possible to adjust this classification by selecting another setting.

[2] DIN 1052:2008-12: Design of timber structures - General rules and rules for buildings. Beuth Verlag GmbH, Berlin, 2008.