Dominant Versus Subordinate Joints

Structural Design User Guide

Modify Sections : Modify Fitting : Dominant Versus Subordinate Joints

Dominant Versus Subordinate Joints

When a joint which has one or more attached sections is repositioned, the effect on those sections depends upon whether or not the joint has been defined as dominant or subordinate, as defined by the setting of the joint’s Joint Freedom (jfree) attribute.

If jfree is set to False (the default for a new joint), the joint is said to be subordinate (also described by saying that the section is dominant). If jfree is set to True, the joint is said to be dominant.

Consider these effects, where the joint’s owning section is moved thus:

The standard default is for joints to be subordinate. The default can be changed by the selection on the SECTIONS tab, in the Settings group, click Tolerances to display the Section Tolerances window.

Joint freedom can be modified after the joint is created by the selection on the SECTIONS tab, in the Modify group, select Dominate or Subordinate from the drop-down list as required. The user is prompted to select the section ends to apply the chosen setting to.

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