Steel Embed Plate with Moment
Steel Embed Plate with Moment
(OP)
What is the most accurate way to analyze a steel embed base plate that has moment and shear? Is it acceptable to design the plate using conventional base plate theory and design the headed studs using PCI guidelines? Any help with this question is appreciated.
Thank You
Thank You
Val Courtney, PE
Valstone Engineering, Inc.






RE: Steel Embed Plate with Moment
Personally in the case of a floor slab, I don't check for shear unless it's a very high shear load. Essentially the load would have to break out a good section of floor in order to be of concern. In the case of a stand alone beam, I design exactly as if it were the end of a concrete beam (stirrups for shear down the foundation, anchor bolts treated as for top and bottom bars analysed as per reinforcing for a beam. With a foundation wall, I combine the two (so long as I have a good load path) since parallel to the wall it is like the floor slab case, and perpendicular to the wall it only works if the base is connected into the floor diaphragm.
I do hope I have correctly interpreted your question!
Regards,
YS
B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...
RE: Steel Embed Plate with Moment
RE: Steel Embed Plate with Moment
What I did is modeled the embed plates using RisaBase and then followed ACI Appendix D for the design of the steel studs. This seems to me to be an acceptable way of designing the base plates.
Val Courtney, PE
Valstone Engineering, Inc.
RE: Steel Embed Plate with Moment
Thank You,
Val Courtney, PE
Valstone Engineering, Inc.
RE: Steel Embed Plate with Moment
RE: Steel Embed Plate with Moment
one major difference between a shear tab on a beam and a shear tab welded to a solid concrete wall/panel is that the beam will rotate slightly to match the beam end rotation whereas the wall/panel will not.
In this situation I will always design the weld for the shear tab so that it is sufficient to cantilever out to the bolt line. I think you will find a reference to this somewhere is the AISC spec.
RE: Steel Embed Plate with Moment
RE: Steel Embed Plate with Moment
Then I was contacted by the steel fabricator to inform me that the concrete wall was 2" short and all the steel was already on the jobsite. The fabricator asked me to design another shear plate for him which would weld to the embed plate and weld to the steel beam.
Well now I was contacted by the steel fabricator stating that they welded the initial shear plate to the steel beam also and were needing a letter stating that the connection was structurally okay. It appears to be structurally okay by engineering judgement, but I wanted a sanity check.
Val Courtney, PE
Valstone Engineering, Inc.