when to design with shear wall?
when to design with shear wall?
(OP)
guys I have question for you....
when it is needed to put shear wall in a building?
what is the basis or criteria to consider that the building need to design with shear wall???
there is an instance that we design concrete two storey residential building. We design the frame as a lateral load resisting frame. We used masonry exterior and interior wall. When we submitted the plans for issuance of building permit, the building official required as to put shear wall. It is my question why we required to put shear wall since we design the structure safe to any anticipated load that may occur and I don't have any idea where the shear wall should be located. The building official doesn't explain why they required us... I want to know what to explain why and when does a particular building need to design with shear wall..
thanks to any input you may have....
when it is needed to put shear wall in a building?
what is the basis or criteria to consider that the building need to design with shear wall???
there is an instance that we design concrete two storey residential building. We design the frame as a lateral load resisting frame. We used masonry exterior and interior wall. When we submitted the plans for issuance of building permit, the building official required as to put shear wall. It is my question why we required to put shear wall since we design the structure safe to any anticipated load that may occur and I don't have any idea where the shear wall should be located. The building official doesn't explain why they required us... I want to know what to explain why and when does a particular building need to design with shear wall..
thanks to any input you may have....






RE: when to design with shear wall?
RE: when to design with shear wall?
Deflection is the reason. Under wind load the frame will move but the brick will not (and isnt the frame supposed to be supporting the masonry?).
Shear walls deflect much less.
Check th building code to see if there is an in plane deflection limit for masonry veneer and if your frame meets it.
csd
RE: when to design with shear wall?
RE: when to design with shear wall?
RE: when to design with shear wall?
RE: when to design with shear wall?
This may be what the building official is concerned about.
OR maybe they have the junior involved in your job and they have never encountered a building without shear walls.
csd
RE: when to design with shear wall?
In most CMU buildings, the exterior walls are shear walls. If they are needed inside, additional CMU shear walls may be added to limit the diaphragm stresses and establish fire zones among other issues.
It is within the responsibility of the plans checker to comment and have you justify your design, but not to do the engineering. That is your job.
Mike McCann
McCann Engineering
RE: when to design with shear wall?
You really should call and ask the guy what he is thinking. Are you in the U.S.?
RE: when to design with shear wall?
Structural design is carried out on the basis of transfering actions/loads on structure back to the ground. On top of the vertical loads (dead and live loads due to gravity) that the building is carrying, it is required to resist horizontal forces (eg. from wind) as well.
For the 2 storey RC building mentioned by migs29, there are a few ways of transfering the horizontal forces back to ground:
1) moment frame - connections between main vertical member (column) and horizontal member (beam) are designed as "fixed", thus stabilizing the structure.
2) shear wall(s) - horizontal actions on building are transfered to the shear wall(s), which is designed as a cantilever beam, by the diaphragm actions (from the slab).
Migs29, from what was said i believe you've adopted the 1st solution. If you've justified in your design that, the columns and beams are able to take the additional moment induced when considering the load case with horizontal actions, i don't see why your design is rejected by the officer.
Probably it is worth clarifying your design with him/her in person. It's actually quite worrying that an officer that couldn't understand something so fundamental is doing the checking... Unless he saw something which wasnt pointed out in your questions.