CEEN One-Way Slab
of 12
-
Upload
gendadeyu552625 -
Category
Documents
-
view
240 -
download
2
Transcript of CEEN One-Way Slab
-
7/30/2019 CEEN One-Way Slab
1/12
Page 1
CEEN 3304 Concrete Design
One-way slabs
Francisco AguigaAssistant Professor
Civil and Architectural Engineering ProgramTexas A&M University Kingsville
Page 2
Slab types
-
7/30/2019 CEEN One-Way Slab
2/12
Page 3
Slab types
Page 4
Slab types
-
7/30/2019 CEEN One-Way Slab
3/12
Page 5
One-way slab behavior
Page 6
Two-way slab deformation
-
7/30/2019 CEEN One-Way Slab
4/12
Page 7
Two-way slab deformation
If ll/ls = 2 ws = 16 wl
EI
lw lll 384
5 4=
EI
lw ssS 384
54
=
4
=
s
l
l
s
l
l
w
w
Page 8
Slab reinforcement
Main reinforcement
Used to resist moment
Shrinkage and temperaturereinforcement
Used to prevent cracking due tocontraction of the concrete resulting from
shrinkage and temperature changes
-
7/30/2019 CEEN One-Way Slab
5/12
Page 9
Slab reinforcement
Minimum reinforcement Shrinkage and temperature
For fy = 40 to 50 ksi As(S&T) = 0.002bh
For fy = 60 ksi As(S&T) = 0.0018bh
For fy > 60 ksi As(S&T) = (0.0018x60xbh)/fy >=0.0014bh
b = 12 in. (1 foot wide strip)
h = Slab thickness (in.)
Page 10
Minimum cover
ACI 7.7.71 (if not exposed to weather orin contact with soil) in. for # 11 and smaller
1.5 in. for # 14 and # 18 bars
-
7/30/2019 CEEN One-Way Slab
6/12
Page 11
Maximum spacing
Main reinforcement ACI 10.5.4
S < smaller of (3 h or 18 in.)
ACI 10.6.4
Using min cover of in. and fs =2/3fy=2/3(60000) = 40,000 psi
S = 12 in.
Shrinkage and Temp. reinforcement ACI 7.12.2.2
Smax (S&T) = min(5h or 18 in.)
=
s
c
s fc
fs
40000125.2
4000015
Page 12
Example
-
7/30/2019 CEEN One-Way Slab
7/12
Page 13
Example
Page 14
Example
-
7/30/2019 CEEN One-Way Slab
8/12
Page 15
Example
Page 16
Design example
Determinethereinforcement atmidspan andat thesupports
-
7/30/2019 CEEN One-Way Slab
9/12
Page 17
Design example
Page 18
Design example
#6
-
7/30/2019 CEEN One-Way Slab
10/12
Page 19
Design example
Page 20
Design example
-
7/30/2019 CEEN One-Way Slab
11/12
Page 21
Design example
Page 22
Design example
-
7/30/2019 CEEN One-Way Slab
12/12
Page 23
Design example
Page 24
Design example
