How do we add a welded or bolted haunch to the beam similar to following?
I noticed RFEM has feature to make the beam tapered so it will act like the haunch.
But I don’t want that. I want to have a real seperate haunch.
How can we do that?
I would say it depends on what verification check you are aiming on. If your main goal is the verification of the joint you could generate a quite precise model by first modelling the two beams without considering the haunch → then use the steel joint add on and create the haunch in the jointaddon dialogue. Doing that you should keep in mind that even if the model of the steel joint is very accurate considering the haunch as a seperated welded part, the cross section verification of the beam in the region is calculated as if the haunch wouldn’t exist, but also kinda unnecessary as if the part of the section could also be seen as proven by the FEA-model of the joint... => Still there is one final thing your checking engineer could argue about: that is the wrong stiffnes in the main model of the structure due to not considering the haunch in stiffnes matrix, which could lead to lower Moments/forces. I personally wouldn’t worry too much about that aswell as you can argue that, by modelling the connection fully rigid in the main model, yo tend to still have higher moments then by considering the joint stiffnes when also considering the additional stiffnes of the haunch. But those are just my ideas and guesses… If you want to consider both: The higher stiffnes in the main model caused due to haunch, aswell as a precise model of the connection with considering the haunch as a seperated part, aswell as the joint stiffnes You could do the following: 1. Create a very simple model of the Joint in a seperate file, just model the 2 beams and the joint In this model you deactivate “active deadload” Now after having modelled the joint You make a stiffnes analization of the joint. 2. In your main file you model the whole structure, the haunches are here modelled in form of tepared beams which are having hinges at there end using the rotational stiffnes of your stiffnes analysis of the other file. You know let the static analysis run 3. Now you turn back to file Number 1 and enter the governing acting forces at the beam to which the haunch is connected (only modelled in the joint model)…… I hope this will help you realizing the project , also I wish you it will be checked without the effort of the last option i Mentioned that would be quite an effort. Please let me know if there is anything wrong about my “idea” to verify your structure.
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