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2.9 Serviceability Parameters
This window controls various settings for the serviceability limit state design. It is displayed if corresponding data has been set in the Serviceability Limit State tab of Window 1.1 (see Chapter 2.1.2).
In column A, you decide whether the deformation refers to single members or sets of members. For a set of members, it is necessary that a uniform member orientation and rotation of all included members is given. Only in this way, the deformation components will be determined correctly.
In column B, you enter the numbers of the members or sets of members that you want to design. You can also use the button to select them graphically in the RFEM/RSTAB work window. Then, the Reference Length appears automatically in column D. The column presets the lengths of the members and sets of members. You can adjust the values Manually after having selected the check box in column C.
In column E, you define the governing Direction for the deformation analysis. You can select the directions of the local member axes y and z (or u and v for unsymmetrical cross-sections).
In column F, a Precamber can be taken into account. The precamber's general direction is defined in the Serviceability tab of the Details dialog box (see Figure 3.4). If the precamber is related to the "major" principal axis y or u, the column title changes to wc,y or wc,u. A positive precamber must be entered, if it is directed against the local member axis z (as a rule when global axis Z is downwards oriented). The precamber is only considered for quasi-permanent design situations (see Chapter 2.1.2)!
For a correct application of limit deformations, the Beam Type is also important. In column G, you can specify whether a beam or a cantilever is to be designed and which end is free of support.
The setting in the Serviceability tab of the Details dialog box indicates whether the deformations are related to the undeformed system or to shifted members ends/set of members ends (see Figure 3.4).