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3 Calculation<br />
3.1.2 Stability<br />
Figure 3.2: Dialog box Details, tab Stability<br />
Stability Analysis<br />
You can select between equivalent member method and a design according to the secondorder<br />
analysis.<br />
When the equivalent member method is selected, the internal forces determined according<br />
to the linear static analysis will be used for the design. Thus, the effective lengths of the<br />
members and sets of members must be specified in table 1.5 and 1.6 to perform the stability<br />
analysis.<br />
When the bearing capacity of a structural system is significantly affected by its deformations,<br />
it is recommended to select a calculation according to the 2nd Order Theory. This<br />
approach requires additionally the definition of imperfections in <strong>RF</strong>EM taken into account<br />
for the load groups.<br />
Please note that you also have to perform the design for lateral torsional buckling for a calculation<br />
according to the second-order analysis. Thus, the lengths for lateral-torsional buckling<br />
of members or sets of members must be specified manually in table 1.5 or 1.6 Effective<br />
Lengths. In this way, we can make sure that the lateral buckling analysis will be performed<br />
with the appropriate factors (for example 1.0).<br />
<strong>Pro</strong>gram <strong>RF</strong>-<strong>TIMBER</strong> <strong>Pro</strong> © 2011 Ing. <strong>Software</strong> <strong>Dlubal</strong><br />
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