This test problem demonstrates the difference between body constraints and equal constraints, as applied to a simply supported beam model. The primary difference between these constraint types is that DOF are coupled when a body constraint is applied. This causes the constrained joints to translate and rotate as a rigid body.
A simply supported beam is modeled once with body constraints joining the beam to its supports, then again with equal constraints. Geometric configuration is shown in Figure 1:
Figure 1 - Structural configuration
Once each system is subjected to a uniform distributed load, analysis generates the results shown in Figures 2-4:
Figure 2 - Deflected configuration
Figure 3 - Shear response
Figure 4 - Moment response
Conclusions may be drawn as follows: