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ALLOWABLE STRESS FOR MASONRY UNITS



Standard Values for Masonry Stress

Solid Units	Building Brick: ASTM C62 Grade MW or SW	f'm = 1,500 psi
Solid Units	Facing Brick: ASTM C216 Grade MW or SW	f'm = 1,500 psi
Solid Units	Concrete Building Brick: ASTM C55 Type 1	f'm = 1,500 psi
Solid Units	Concrete Masonry Units: ASTM C90 Type 1	f'm = 1,500 psi
Hollow Units	Concrete Masonry Units: ASTM C90 Type 1	f'm = 1,350 psi
Hollow Units	Glased Structural Facing Units ASTM C126 Type 1	f'm = 1,350 psi
Hollow Units	Hollow Brick Unit ASTM C652 Grade MW or SW	f'm = 1,350 psi
Solid or Hollow Units	Materials where ultimate compressive stress f'm is established by approved prism tests	f'm = Test Value not to exceed 3,500 psi

Standard Values for Solid Units

Compression - Axial Walls	Solid Units	Fa = .2fm [ 1- (12h/40tn)3 ] h = The clear height of the wall, feet. tn = The nominal thickness of the wall, inches
Compression - Axial Columns	Solid Units	Fa = P/Ae P = The applied axial load, lbs. Ae = The effective transformed area of the column (or pilaster) based on actual cross sectional in2
Flexural	Solid Units	500 psi
Shear - No Shear Steel	Solid Units	39 psi
Shear - Full Shear Steel Flexural Members	Solid Units	117 psi
Shear - Full Shear Steel Shear Walls	Solid Units	See Shear Wall Design Requirements
Modulus of Elasticity	Solid Units	1,500,000 psi
Modulus of Rigidity	Solid Units	600,000 psi
Bearing on full area	Solid Units	375 psi
Bearing on 1/3 or less area	Solid Units	450 psi

Standard Values for Hollow Units

Compression - Axial Walls	Hollow Units	Fa = .2fm [ 1- (12h/40tn)3 ] h = The clear height of the wall, feet. tn = The nominal thickness of the wall, inches
Compression - Axial Columns	Hollow Units	Fa = P/Ae P = The applied axial load, lbs. Ae = The effective transformed area of the column (or pilaster) based on actual cross sectional in2
Flexural	Hollow Units	450 psi
Shear - No Shear Steel	Hollow Units	37 psi
Shear - Full Shear Steel Flexural Members	Hollow Units	111 psi
Shear - Full Shear Steel Shear Walls	Hollow Units	See Shear Wall Design Requirements
Modulus of Elasticity	Hollow Units	1,350,000 psi
Modulus of Rigidity	Hollow Units	540,000 psi
Bearing on full area	Hollow Units	338 psi
Bearing on 1/3 or less area	Hollow Units	405 psi

Values where f'm is established through prisim tests

Compression - Axial Walls	Hollow/Solid	Fa = .2fm [ 1- (12h/40tn)3 ] h = The clear height of the wall, feet. tn = The nominal thickness of the wall, inches
Compression - Axial Columns	Hollow/Solid	Fa = P/Ae P = The applied axial load, lbs. Ae = The effective transformed area of the column (or pilaster) based on actual cross sectional in2
Flexural	Hollow/Solid	0.333f'm not to exceed 900 psi
Shear - No Shear Steel	Hollow/Solid	f'm0.5 not to exceed 50 psi
Shear - Full Shear Steel Flexural Members	Hollow/Solid	3(f'm)0.5 not to exceed 120 psi
Shear - Full Shear Steel Shear Walls	Hollow/Solid	See Shear Wall Design Requirements
Modulus of Elasticity	Hollow/Solid	1000f'm not to exceed 3,000,000 psi
Modulus of Rigidity	Hollow/Solid	400f'm not to exceed 1,200,000 psi
Bearing on full area	Hollow/Solid	.25f'm not to exceed 900 psi
Bearing on 1/3 or less area	Hollow/Solid	30f'm not to exceed 1050 psi

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