Existing brick masonry wall - bending

[cepe01]

I am checking the lateral load capacity of an existing brick wall. Shear is straight forward but how do I calculate the horizontal bending capacity?

ACI 530 states that fb = calculated compression stress in masonry due to flexure only, psi

Is the tensile strength of mortar to brick so low that I ignore any strength from tension and only use the "compression zone" of the neutral axis?

If the available strength in the compression side is greater than the total bending stress is that good enough or may horizontal still appear on the tension side?

 

[WARose]

The allowable for unreinforced masonry is pretty straight forward. For tensile stress the calculation is the familiar:

fb= -(P/A) + M/S <Fbt

Where the allowable (Fbt) is in the code. (And typically ranges from about 9-80 psi depending on Mortar types, direction of tension, etc. See Table 2.2.3.2 in ACI 530-05.)

For compression it is:

fa/Fa + fb/Fb <1

Where Fa is also in code (and is dependent on h/r ratio) and Fb=0.33*f'm (IIRC).

 

[cepe01]

Can you tell me where the equation

 

[WARose]

Can you tell me where the equation

Where the equation is in the code? Which one?

 

[dik]

There are two?

Dik