Stack Bond CMU Design
Stack Bond CMU Design
(OP)
Are there any special structural considerations/restrictions/requirements in the design of stack bond cmu walls. We will be having both perimeter backup walls for lateral support of brick veneers as well as interior partitions.






RE: Stack Bond CMU Design
2) Check your code to make sure shearwalls can be constructed as stacked bond if in seismic area.
3) I am not sure if the wall will act like a T beam for out of plane bending or not (partially filled and reinforced cells). In fact, I know some engineers that will only use stacked bond walls if they are solid grouted in all cells.
I have tried to search out information on stacked bond walls in structural applications before and was not real successful.
RE: Stack Bond CMU Design
Design of Masonry Structures
Narenda Taly
RE: Stack Bond CMU Design
RE: Stack Bond CMU Design
The definition of running bond requires that head joints in successive courses of masonry are horizontally offset at least one-quarter the length of the units. Anything other than this is considered "stack bond". It is possible to lay units without the head joints vertically aligned and still be considered stack bond.
There are specific corner units ("L" shaped) made to provide runing bond for 6", 10" and 12" thick walls in addition to the typical 8x8x16 corner units.
It is not necessary to stack bond the masonry units that are reinforced. There are many units that provide adequate core alignment in the common reinforced wall thicknesses (6", 8" & 12"). Because of the alignment, it is not necessary to grout a wall solid, which is an ineffective method of increasing strength. If this is a reasonable size project you could get much higher block strengths as required.
There also may be a cost increase for stack bond if the wall is exposed.
The ACI 530 commentaries are very valuable.
Dick
RE: Stack Bond CMU Design
RE: Stack Bond CMU Design
RE: Stack Bond CMU Design
Often, two faces scored are cheaper (labor cost) in back-up construction since a bad face can be turned toward the cavity, since it costs more to throw away or patch a chipped block than it costs.
Dick
RE: Stack Bond CMU Design
See Also Paragraphs 1.11 for mimnimum area of horizontal steel.
RE: Stack Bond CMU Design