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.

Modeling

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

Analysis

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

Commentary

Conclusions may be drawn as follows:

Attachments