Properties need not be input for anchors. Moment free anchors are used to model supports that doesn't resist the moments.
It restricts upward and downward pipe displacement, as well as along and perpendicular to the pipe axis displacement. If pipe cross-section rotation resistance is insignificant, since support length (dimension along the pipe axis) is usually comparable to pipe cross-section dimensions (1 diameter), rotational restraints (restricting bending and rotation) are ignored. Such supports doesn't resist the moments and do not restrict rotation.
For example, the shoe of this support is short, so it can be modeled as moment free anchor:
Also moment free anchor can be used to model the situation when pipe continuation is unknown.
These supports are modeled with three double-acting linear rigid restraints. See "custom restraints"
Property |
Description |
Name |
Element name. If checked then it shown in 3D view |
Check allowable loads |
START-PROF automatically checks allowable load values against analysis results. If allowable values are exceeded, the corresponding warning is displayed |
Loads in local axes |
If not checked, allowable loads are set for global coordinate axes; if checked, they are for local axes of the adjoining element |
FX, FY, FZ |
Allowable load values for the X,Y and Z axes, respectively |
To insert an element, select the desired node and use: Insert > Insert Restraint > Moment Free Anchor
or press the 
toolbar icon.
To view properties of an existing element:
Double-click the element in the 3D view
Select the
element and press the 
toolbar icon