Moment connection with bolts in circulat pattern...
Moment connection with bolts in circulat pattern...
(OP)
Hello everybody...
some help please...
I want to calculate a moment beam to beam connection (tubes actually) with bolts in a circular pattern...
Is there any software to do this?
Or is there any methodology for calculating this...?
Any help would be really really appreciated...!!
THANK YOU ALL...!
some help please...
I want to calculate a moment beam to beam connection (tubes actually) with bolts in a circular pattern...
Is there any software to do this?
Or is there any methodology for calculating this...?
Any help would be really really appreciated...!!
THANK YOU ALL...!






RE: Moment connection with bolts in circulat pattern...
I have designed some connections in the past like this through rigorous FEM and checking every thing i could think of.
For round baseplates i used an approach i founf in ASCE 48-05 for steel transmission structures....steel poles.
RE: Moment connection with bolts in circulat pattern...
RE: Moment connection with bolts in circulat pattern...
RE: Moment connection with bolts in circulat pattern...
RE: Moment connection with bolts in circulat pattern...
You have a series of bolts - some in tension, some in comression, each at a different moment arm from the nuetral axis intersection of the baseplate and support body.
RE: Moment connection with bolts in circulat pattern...
I have uploaded a method that I would use to calculate my bolt loads in your situation.
Just to clarify "M" in my uploaded file would be the moment your beam is subjected to at the joint.
Hopefully I have interpreted your question correctly.
Regards
desertfox
RE: Moment connection with bolts in circulat pattern...
I forgot to mention you will need to account for the direct shear on the bolts as the file I have uploaded only caters for the tensile load due to the moment.
desertfox
RE: Moment connection with bolts in circulat pattern...
Clansman
If a builder has built a house for a man and has not made his work sound, and the house which he has built has fallen down and so caused the death of the householder, that builder shall be put to death." Code of Hammurabi, c.2040 B.C.
RE: Moment connection with bolts in circulat pattern...
RE: Moment connection with bolts in circulat pattern...
RE: Moment connection with bolts in circulat pattern...
RE: Moment connection with bolts in circulat pattern...
htt
The paper below may also be of interest:
www.risat
RE: Moment connection with bolts in circulat pattern...
The method I posted does exactly what you suggest, it assumes that the joint is rigid and the bolts take the tensile load its very similar to a splice joint.
desertfox
RE: Moment connection with bolts in circulat pattern...
RE: Moment connection with bolts in circulat pattern...
I have found myself, in designing this type of connection, assuming many different "bend lines" in order to size the plate thickness.
As far as determining bolt axial loads due to moment I always used a bending stress analogy in the form of F=Mc/I with "c" being the distance from the neutral axis of bending and I = 1.0 assuming the bolt area equal to unity.
I hope i am making sense here... it is new years day...at 12:38 am...catch my drift...i am a geek
RE: Moment connection with bolts in circulat pattern...
That however stills leaves you designing welds and plates.
RE: Moment connection with bolts in circulat pattern...
Interesting approach cntw1953 with the tension only concept and the linear springs in FEM modeling!
Thank you dvd for the references, the paper is very extensive and I think it covers many cases!
Stillerz ishvaaag racookpe1978 Clansman StructuralEIT, thank you for your remarks...!
Great reference everyone...!!
Thank you ALL...! I'm working it out...
RE: Moment connection with bolts in circulat pattern...
Your welcome and happy new year.
You can see the method used at this site for bolts under bending loads:-
htt
Its a relatively simple hand calculation but takes no account of plate stiffness.
desertfox
RE: Moment connection with bolts in circulat pattern...
RE: Moment connection with bolts in circulat pattern...
RE: Moment connection with bolts in circulat pattern...
First:
Dan Horn (the original author for ERITower) put together a technical reference on this subject for the ERITower / RISATower program a number of years ago. This mostly covers base plates for monopole communications towers. But, it is the most comprehensive treatment of the topic that I have found.
If you're interested, it can be downloaded from the following URL:
http:/
Second:
The RISABase program does an automated FEM analysis of these types of baseplates. For those of you who are interested in this type of method, then this program could reduce the amount of time and energy you spend generating this type of a solution.
Josh
RE: Moment connection with bolts in circulat pattern...
RE: Moment connection with bolts in circulat pattern...
I think what can be more difficult and less published is determining the plate stresses.