Modeling Moment and Shear Connections

[CivilSigma]

Homework Statement

I am trying to model a structure that has moment connections between some beams and columns, and shear connections between the remaining beam and columns in 3D.

The software I am using (S-Frame 11) gives me an error when running the analysis for the nodes that I have defined as moment connections :

• No rotation about x,y,z axis
• No translation about x,y,z axis

The error is : "Illeagel constraint to the support"

Homework Equations

I know that a moment connection prevents rotation and translation about all axis

The Attempt at a Solution

Can some one please provide guidance to how I can define a moment connection or if my understanding of a moment connection is correct?

This figure represents the definition I used for a Moment connection at one of the nodes:

This is my general model of the steel frame building I am going to analyze under gravity and lateral loads. If you can see, I have some nodes as fixed (line with dash underneath - those are the moment connections).

 

[CivilSigma]

For those who are interested: to model a moment connection, you simply define the joint as a rigid joint.

You do not play around with the degrees of freedom at the joint (only if it is fixed in real conditions, like at the foundation/base). But a moment connection implies that the members are welded together = a rigid joint (that is still able to translate about x,y,z). Also a rigid connection is the default condition set when you model a member connecting into a joint!