Shear wall with or without flanges?
Shear wall with or without flanges?
(OP)
Hi,
Did anybody find out the difference in (concrete) shear wall reinforcement if you model them with or without flanges?
Thank you for any commnet.
Did anybody find out the difference in (concrete) shear wall reinforcement if you model them with or without flanges?
Thank you for any commnet.
Drile007






RE: Shear wall with or without flanges?
RE: Shear wall with or without flanges?
Yes, I know there is a big difference, but how big is it (approximately). I wondering what is the common engineer praxis...modeling whit or without flanges?
Drile007
RE: Shear wall with or without flanges?
RE: Shear wall with or without flanges?
RE: Shear wall with or without flanges?
RE: Shear wall with or without flanges?
How? What’s the width of the flange, is that constant through the height of the building, modeling two piers for every direction and combining the results, etc., etc.. I know we should do it, but I think in the common praxis nobody plays with that?
RE: Shear wall with or without flanges?
RE: Shear wall with or without flanges?
RE: Shear wall with or without flanges?
Interested point of view StructuralEIT (I think that's the real behavior)...
But still nobody answer me, are they modeled in common praxis?
PS: Maybe is my question too "dangerous" for open forum?
RE: Shear wall with or without flanges?
RE: Shear wall with or without flanges?
Thanks StructuralEIT...you confirm me my thought!
But is there any clause in US codes which force to model them? There is a clause in Eurocode!
RE: Shear wall with or without flanges?
RE: Shear wall with or without flanges?
RE: Shear wall with or without flanges?
StructuralEIT and others:
Will you model the flanges if there is the clause in your codes to do so?
RE: Shear wall with or without flanges?
Once you get the analysis forces from a 3-D model, you can either design the entire wall as one section - most optimal solution (all loads are applied at the center of rigidity of the wall) or design each wall for its resolved component of the total force. In the second approach you can use the flange effects for design or ignore the flange effects.
RE: Shear wall with or without flanges?
We use RAM and I don't think you can model a flanged shearwall. Does your program allow you to do this? Even at the corners of the building, you model two seperate walls, not one wall going around the corner.
drile007-
If the code tells you that you must model it that way, then I guess you must. That being said, I don't think the IBC says that. Our projects use the IBC typically.
RE: Shear wall with or without flanges?
RE: Shear wall with or without flanges?
Take an example a elevator core - rectangular box, you can define each face as one or multiple wall elements, interconnected at the corners. If you are doing a second order analyses wherein you are required to account for multiple modes of bending, this method might not be correct as shell elements used for walls does not account for these effects. Typically in such cases the entire core is modeled as a flextural element.
For the design, you can define the entire core as one wall group and design this section for biaxial bending, shear and torsion (RAM reports the wall group forces at the wall CG). RAM version 13 (I am one of the alpha evaluator) is in the process of implementing this to their design. If you are running RAM V12, you can import the model to RAMADVANSE and do the design. The design in RAMADVANSE is capable of utilizing the flanges per ACI code.
Currently the only commercial program I am aware of is ETABS which has capability to design a 3-D section. This design is very optimal and can make a huge difference in a high rise building.
RE: Shear wall with or without flanges?
I may come back and ask you another question about that at some point.