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CRACKING MOMENT STRENGTH OF A MASONRY WALL



The cracking moment strength of a wall, M_cr , is determined as follows:

M_cr = 2I_gf_r/t

Where: f_r = the modulus of rupture for calculating deflection equal to 2.5(f_m)^0.5 and f_m is the stress in the masonry
t = The actual thickness of the wall, inches.
I =The gross moment of inertia of the wall, in⁴

The cracking moment strength along with the gross moment of inertia, I , are listed below for various wall thicknesses and reinforcing spacings.

	Nominal Wall Thickness
Width	6		8		10		12
b2	Ig in4	Mcr ft-lbs	Ig in4	Mcr ft-lbs	Ig in4	Mcr ft-lbs	Ig in4	Mcr ft-lbs
48	---	---	1319	2648	2470	3929	4119	5424
40	---	--	1113	2235	2902	3328	3499	4608
32	377	1027	907	1822	1714	2727	2879	3792
24	290	791	702	1409	1337	2126	2260	2976
16	204	554	496	995	959	1525	1640	2160
8	119	323	296	593	594	946	1047	1379

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