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# Masonry Wall Design- Ig and Icr

## Masonry Wall Design- Ig and Icr

(OP)
I would be very grateful if someone could direct me to any websites which give information on the calculation of the Gross Moment of Inertia (Ig) of masonry units along with the calculation of the Cracked Moment of Inertia (Icr). I require this info for designing cmu walls using the Strength Design Method in accordance with UBC:1997.

Regards

Mike

### RE: Masonry Wall Design- Ig and Icr

For an uncracked section including steel:

Ig = [b(kd)^3]/3+[b(h-kd)^3]/3+(n-1)As(d-kd)^2

For many of the variables think of a reinforced concrete section.

w/o steel:  Ig = [bh^3]/12

For a cracked section:

Icr = [b(kd)^3]/3+(npbd)(d-kd)^2 where p is rho.

This information is found in Reinforced Masonry Design by Schneider and Dickey.

### RE: Masonry Wall Design- Ig and Icr

(OP)
Qshake
Thanks for the swift response and the info

Regards

Mike

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