Lb Top (Top unbraced length for bending)

Sets the top unbraced length for bending that is used to determine the nominal moment member capacity according to Clause 5.6. The default value of the top unbraced length for bending is the modeled member length.

It is also possible to define several unbraced lengths for the member in question, as shown in the figure below:

Figure 1. Beam braced at ends and third points

In this case, each unbraced length must be written, each one of them separated by semicolons, i.e.:

Note that the lengths are consecutive.