Rigid joints

[eissenhover]

Hello everyone, I had a few questions, I would be very happy if you could answer them. 1) When I make an "angle joint" between the column and beam, for example, there is a moment-free connection as you can see in the picture. when I make a welded joint of the same elements, when I look at the element end freedoms in the analysis model, there is no moment-rotation. Is a welded joint a rigid joint that does not transmit torque? 2) My other question is what are the tricks of understanding whether a joint transfers moment by looking at its type, for example, how do we know whether the angle joint in the picture transfers moment without looking at the end freedoms, that is, without looking at any analysis results, I would like to ask you in rough terms, the angular joint you see in the picture does not transfer moment and does not allow rotation. is given, but if I see this production in the field, I would ask myself how it can rotate, so this rotation event does not sit in my mind.

 

[eissenhover]

Finally, it has nothing to do with steel, but I just created a simple model for testing purposes, my purpose was to see how the basic reinforcement drawings on the stepped foundation were given. Also, in the static analysis section of the building tree, only G and Q loads are seen in the loading conditions section, earthquake etc. downloads are not visible, is the program handling these downloads in the background?

 

[taydoner]

The attached picture may help you with your questions. It should be considered as not a rotation in the sense you think, but accepting the joints below a certain stiffness value as non-moment transferring. In the connection you have shown with brackets, the beam must be able to transfer loads from its lower and upper head in order to transfer moment to the column at a certain rate of its own capacity. However, since the angles are attached to the body of the beam, the moment transfer will be very limited, the connection is considered as non-moment transferring class (in the flexible stiffness class). If we classify the joints according to their stiffness based on moment-rotation relationship; can be divided into three classes as rigid, semi-rigid and flexible. You can find detailed explanations on the subject under Article 5.2 of TS EN 1993-1-8.