Masonry Design

2 MASONRY WALLS CONSTRUCTION TYPE Single Wythe Cavity Prefabricated Barrier Masonry Veneer Masonry Bonded Hollow Wall

3 MASONRY WALLS STRUCTURAL FUNCTION Veneer Nonloadbearing Loadbearing Shear

4 TYPES OF LOADING External Loads Gravity Wind Earthquake Earth pressure

5 ACCUMULATION OF AXIAL LOAD WITH HEIGHT BEARING – WALL BUILDING

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7 AXIAL STRESSES IN BEARING WALL WITH UNIFORMLY DISTRIBUTED AXIAL LOAD

8 AXIAL STRESSES IN BEARING WALL WITH CONCENTRATED AXIAL LOAD

9 ARCHING ACTION BETWEEN MULTIPLE OPENINGS

10 FREE-BODY DIAGRAM OF A LINTEL ACTING AS A BEAM

11 FREE-BODY DIAGRAM OF A LINTEL ACTING AS AN ARCH

12 SHEAR WALL LOAD FROM ROOF OR FLOOR DIAPHRAGM

13 ACTION OF HORIZONTAL AND VERTICAL STRIPS ASSUMED FOR DESIGN

14 SPAN-TO-WIDTH RATIOS FOR FLOOR DIAPHRAGMS

15 STRUCTURAL ACTIONS ON SHEAR WALLS

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17 Bar Size Designation Diameter (inches) Weight lb/ft Nominal Perimeter Nominal Cross Section Area (in 2 ) Bar Size Designation FractionDecimal #33/ #3 #41/ #4 #55/ #5 #63/ #6 #77/ #7 # #8 #91 1/ #9 #101 1/ #10 #111 3/ #11 #141 3/ #14 #182 1/ #18 ASTM Standard Reinforcing Bars

18 Required Lap Length of Bars in Inches* Bar Size Diameter (d, in.) 2005 MSJC Allowable Stress Design 2005 MSJC Strength MBC 2006 Allowable Stress Design (48d, in.)** MBC 2006 Strength Design 8" CMU 12" CMU8" CMU 12" CMU #33/ #44/ #55/ #66/ #77/ #88/ * Assume bar placed in center, Grade 60 steel, 48" o.c. spacing, and f' m =1500psi ** Where design tensile stresses are > 80% of F s, lap length shall be increased not < 50% of the minimum required length.