Masonry Construction 1
Lecture 28 Architectural Structures
ARCHITECTURAL STRUCTURES:
FORM, BEHAVIOR, AND DESIGN
lecture
twenty eight
masonry construction:
beams & columns www.tamu.edu
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Masonry Construction - Architectural Structures - Lecture Slides, Slides of Structural Design and Architecture
Masonry Construction, Masonry Design, Masonry Standards, Joint Committee, Masonry Beam, Wall Design, Reinforcement Increases Capacity, Yield Stress, Masonry Materials, Fills Voids and Fixes Rebar. Its lecture of Architectural Structures. A complete lecture series is in my files.
Typology: Slides
2011/2012
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Masonry Construction 1
Lecture 28
Architectural Structures
ARCHITECTURAL STRUCTURES:
FORM, BEHAVIOR, AND DESIGN
lecture
twenty eight
masonry construction:
beams & columns
www.tamu.edu
Masonry Construction 2
Lecture 28
Architectural Structures
Office Hours
link to posted schedule
- Masonry Standards Joint Committee
– ACI, ASCE, TMS
- ASD (+empirical)
- linear-elastic stresses
- LRFD added in 2002
- referenced by IBC
- unreinforced allows tension in
flexure
- reinforced - all tension in steel
- walls are also in compression
Masonry Construction 4
Lecture 28
Architectural Structures
Masonry Design
International Masonry Institute (Brian Trimble)
Masonry Construction 5
Lecture 28
Architectural Structures
Masonry Beam & Wall Design
- reinforcement increases capacity &
ductility
Masonry Construction 7
Lecture 28
Architectural Structures
Masonry Materials
- units
- stone, brick, concrete block, clay tile
www.GlenGerybrick.com
National Concrete Masonry Association
Masonry Construction 8
Lecture 28
Architectural Structures
Masonry Materials
- mortar
- water,
masonry cement,
sand, lime
- types:
- M higher strength – 2500 psi (ave.)
- S medium high strength – 1800 psi
- N medium strength – 750 psi
- O medium low strength – 350 psi
- K low strength – 75 psi
W
R
A
O
National Concrete
Masonry Association
Masonry Construction 10
Lecture 28
Architectural Structures
Masonry Materials
- moisture resistance
- weathering index
for brick
- bond and detailing
- expansion or
shrinking from water
- provide control joints
- parapets, corners,
long walls
parapet with no
control joint
Masonry Construction 11
Lecture 28
Architectural Structures
Allowable Masonry Stresses
- tension - unreinforced only
Masonry Construction 13
Lecture 28
Architectural Structures
Allowable Masonry Stresses
- flexure
– F
b
= 1/3 f’
m
(unreinforced)
– F
b
= 0.45 f’
m
(reinforced)
- shear, unreinforced masonry
– F
v
= 120 psi
- shear, reinforced masonry
- M/Vd 0.25: F
v
- M/Vd 0.25: F
v
=
m
. f
m
. f
m
. f
2 0
Masonry Construction 14
Lecture 28
Architectural Structures
Allowable Reinforcement Stress
- tension
a) Grade 40 or 50 F
s
= 20 ksi
b) Grade 60 F
s
= 32 ksi
c) Wire joint F
s
= 30 ksi
- *no allowed increase by 1/3 for
combinations with wind & earthquake
- did before 2011 MSJC code
Masonry Construction 16
Lecture 23
Reinforcement, M
m
grout
unit
t
d
n.a.
A
s
T
s
=A
s
f
s
C
m
=f
m
b(kd)/
jd
F=0:
jd 0. 5 f bd jk
kd
M f b
2
m m m
kd
MSJC F
b
=0.33f’
m
kd
A f f b
s s m
if f
s
=F
s
(allowable) the moment capacity is limited by the steel
M about T
s
:
Masonry Construction 17
Lecture 28
Masonry Lintels
- distributed load
- triangular or trapezoidal
Masonry Construction 19
Lecture 28
Architectural Structures
Ultimate Strength Design
- LRFD
- like reinforced concrete
- useful when beam shear is high
- improved inelastic
model
- ex. earthquake loads
T
1
c
0.80 f’
m
C
2
c
1
Masonry Construction 20
Lecture 28
Architectural Structures
Masonry Columns and Pilasters
- must be reinforced