Date post: | 07-Aug-2015 |
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CE-2106
DESIGN OF CONCRETE STRUCTURES-1 (SESSIONAL)
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REINFORCEMENT DETAILING OF RC
TIED COLUMN
PRESENTATION ON
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Authorized by
DR. MD. MOZAMMEL HOQUE MD. KOBIR HOSSAIN
ASSOCIATE PROFESSORDEPARTMENT OF CIVIL
ENGINEERINGDUET, GAZIPUR-1700
LECTURERDEPARTMENT OF CIVIL
ENGINEERINGDUET,GAZIPUR-1700
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Our Group Member’s Student ID :121037 121038 121039 121040 121041 121042 121043
Student ID :121044 121045 121046 121047 121048 121049 121050
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Why do detailing of RC member?
Use commonly available size of bars and spirals. For a single structural member the number of different sizes of bars shall be kept minimum. Schedule bundled bars, lapped splice of bundled bars shall be made by splicing one barIndicate proper cover-clear cover, nominal cover or effective cover to reinforcement.
Use commonly available size of bars and spirals. For a single structural member the number of different sizes of bars shall be kept minimum.
Prepare drawings properly & accurately.
Generally Columns are vertical compression members of a structural frame intended to support the load-carrying beams. They transmit loads from the upper floors to the
lower levels and then to the soil through the foundations.
A member which design consider as axial load is called column
Main steel is provided to resist compression load along with concrete
Usually columns carry bending moment as well, about one or both axes of the cross section, and the bending
action may produce tensile forces over a part of the cross section
The main reinforcement in columns is longitudinal, parallel to the direction of the
load
Column
Longitudinal bar
Tie bar
Longitudinal bar
Tie bar6
Shape of Column
Circle
Square
Rectangle
o Min. 4 bars in rectangular/square column and min. 6 bars in circular shape column
2.5
b
h
d ≥12’’
d ≥ 12’’
Size of Column
2.5
Circular & Square column dm at least 12” or 300 mmRectangular column h/b >2.5
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h/b
Longitudinal Bar
The size of main bar isn’t matter
Reinforcement Building
At least 10 mm dia
Tie bar
main bar φ ≥ 32 mm
12 mm dia
Tie bar
Whenever longitudinal bar φ ≥ 32mm
Reinforcement building :Tie bar φ≥10mm φ
Semi Reinforcement : Any φ bar
Tie bar
Reinforcement Building
At least 10 mm diaTie bar
Sami Reinforcement Building
Any dia Tie bar
Minimum reinforcement provided at least (1-8)% according to ACI code
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For non seismic zone or ordinary moment reisting frame(OMRF)
S1=16 dm (minimum dia)
S2=48 tie bar
Minimum dimension.
Minimum s be provide
Seismically active region (IMRF/SMRF)
450mm
H/6 (not less than 18”)
Minimum dimension.
L1
L2
Middle part tie spacing similar to the OMRF
Spacing half of the middle part
Tie bar spacing
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L1
L1
L2
L1
When concrete of column carry maximum of load
If axial load is lower than longitudinal or main bar In that case main bar can be provide 50 % of architectural area
Corner tie spacing
75 mm
Spacing of main bar s>6” so each bar needed to a corner Bend of hook doesn’t exceed 135° Spacing of corner bar minimum 75 mm10
Min. distance b/w individual bars
-Minimum the dia of larger bar
-5mm more nominal max. size of coarse aggregate
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Why need distance bar to bar? For giving space when lap splice provide. When main bar of beam pass across the beam. 1.5” covering maintain impossible.
Why tie bar use in column? Maintain the position of longitudinal reinforcement
To prevent their buckling which may cause splitting of concrete. Assist confining the concrete
Lap Region
Lap should not provide near to the maximum moment. Lapping should not provide 50% more than any particular position It’s better to provide lapping in position of middle zone of column. In lap region tie should be provided closely as end region of column tie spacing.
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Tie bar alignment
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If spacing between two bar >6” tie should be provide with each main bar.If ≤6” tie should be provide alternately each main bar.
Thanks to All
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Any Query ??
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