Masonry Design

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Masonry Design
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MASONRY WALLSCONSTRUCTION TYPE

• Single Wythe
• Cavity
• Prefabricated
• Barrier
• Masonry Veneer
• Masonry Bonded Hollow Wall

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MASONRY WALLSSTRUCTURAL FUNCTION

• Veneer
• Nonloadbearing
• Loadbearing
• Shear

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TYPES OF LOADING

• External Loads
• Gravity
• Wind
• Earthquake
• Earth pressure

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ACCUMULATION OF AXIAL LOAD WITH HEIGHT BEARING
WALL BUILDING
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ACCUMULATION OF AXIAL LOAD WITH HEIGHT BEARING
WALL BUILDING
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AXIAL STRESSES IN BEARING WALL WITH UNIFORMLY
DISTRIBUTED AXIAL LOAD
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AXIAL STRESSES IN BEARING WALL WITH CONCENTRATED
AXIAL LOAD
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ARCHING ACTION BETWEEN MULTIPLE OPENINGS
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FREE-BODY DIAGRAM OF A LINTEL ACTING AS A BEAM
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FREE-BODY DIAGRAM OF A LINTEL ACTING AS AN ARCH
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SHEAR WALL LOAD FROM ROOF OR FLOOR DIAPHRAGM
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ACTION OF HORIZONTAL AND VERTICAL STRIPS ASSUMED
FOR DESIGN
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SPAN-TO-WIDTH RATIOS FOR FLOOR DIAPHRAGMS
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STRUCTURAL ACTIONS ON SHEAR WALLS
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ASTM Standard Reinforcing Bars
Bar Size Designation Diameter (inches) Diameter (inches) Weight lb/ft Nominal Perimeter Nominal Cross Section Area (in2) Bar Size Designation
Bar Size Designation Fraction Decimal Weight lb/ft Nominal Perimeter Nominal Cross Section Area (in2) Bar Size Designation
3 3/8 0.375 0.376 1.178 0.11 3
4 1/2 0.500 0.668 1.571 0.20 4
5 5/8 0.625 1.043 1.963 0.31 5
6 3/4 0.750 1.502 2.356 0.44 6
7 7/8 0.875 2.044 2.749 0.60 7
8 1 1.000 2.670 3.142 0.79 8
9 1 1/8 1.128 3.400 3.544 1.00 9
10 1 1/4 1.270 4.303 3.990 1.27 10
11 1 3/8 1.410 5.313 4.430 1.56 11
14 1 3/4 1.693 7.650 5.320 2.25 14
18 2 1/4 2.257 13.600 7.090 4.00 18
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Required Lap Length of Bars in Inches
Bar Size Diameter (d, in.) 2005 MSJC Allowable Stress Design 2005 MSJC Allowable Stress Design 2005 MSJC Strength MBC 2006 Allowable Stress Design (48d, in.) MBC 2006 Strength Design MBC 2006 Strength Design
Bar Size Diameter (d, in.) 8" CMU 12" CMU 8" CMU MBC 2006 Allowable Stress Design (48d, in.) 8" CMU 12" CMU
3 3/8 15.1 15.1 15.1 18 15.1 15.1
4 4/8 20.1 20.1 20.1 24 20.1 20.1
5 5/8 25.2 25.2 25.2 30 25.2 25.2
6 6/8 42.8 39.3 42.8 36 39.3 39.3
7 7/8 59.4 45.8 59.4 42 45.8 45.8
8 8/8 91.2 60.4 91.2 48 60.4 60.4
Assume bar placed in center, Grade 60 steel,
48" o.c. spacing, and f'm1500psi Where design
tensile stresses are gt 80 of Fs, lap length
shall be increased not lt 50 of the minimum
required length.