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8/13/2019 G Detailing
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Department of Civil Engineering
NED University Engineering & Technology
Building
Prof Sarosh Lodi
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Department of Civil Engineering
NED University Engineering & Technology
TOPICS COVERED
Intro
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Department of Civil Engineering
NED University Engineering & Technology
FLEXURAL MEMBERS OF SMRFGeneralClear span not less than 4 times effective depth
Width/depth ratio not less than 0.3
Width not less than 10 in
Width not more than width of supporting member plus distance on each side
of supporting member equal to of the depth of flexural member
Cont.
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Department of Civil Engineering
NED University Engineering & Technology
FLEXURAL MEMBERS OF SMRFLongitudinal ReinforcementReinforcement ratio not less than 200/fy
Reinforcement ratio not more than 0.025
Two bars should be continuous in top and bottom
+ve moment strength at joint face should not be less than ofve moment
strength
+ve orve moment strength at any section should not be less than of
strength at joint face
Lap allowed only with hoop or spiral reinforcementLap splices are not allowed
within joints
a distance of 2d from joint face
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Department of Civil Engineering
NED University Engineering & Technology
FLEXURAL MEMBERS OF SMRFLongitudinal Reinforcement
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Department of Civil Engineering
NED University Engineering & Technology
FLEXURAL MEMBERS OF SMRFTransverse ReinforcementMaximum hoop spacing shall not exceed
d/4
8 times dia of smallest longitudinal bar
24 times dia of hoop bar
12 in
Examples of hoops are
Cont.
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Department of Civil Engineering
NED University Engineering & Technology
COLUMNS FOR SMRFGeneralShortest cross-sectional dimension is 12 in.
Ratio of shortest dimension to perpendicular dimension shall not be less
than 0.4
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Department of Civil Engineering
NED University Engineering & Technology
COLUMNS FOR SMRFReinforcementLongitudinal reinforcement ratio not less than 0.01 and not more than 0.06
Concrete cover for transverse reinforcement shall not exceed 4 in.
Spacing of rings (s) shall not exceed
s= of minimum column dimension
s=6 times dia of longitudinal bar
s=4+[(14-hx)/3] 4< s
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Department of Civil Engineering
NED University Engineering & Technology
COLUMNS FOR SMRFReinforcementSpacing (S1) for the rest of column length is smaller of
6 times longitudinal bar dia
6 in.
Example of rings is
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Department of Civil Engineering
NED University Engineering & Technology
COLUMNS FOR SMRF
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Department of Civil Engineering
NED University Engineering & Technology
COLUMNS FOR SMRF
h l
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Department of Civil Engineering
NED University Engineering & Technology
COLUMNS FOR SMRF
i i i i & h l
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Department of Civil Engineering
NED University Engineering & Technology
COLUMNS FOR SMRFJoints
Beam longitudinal reinforcement must be extended to the far face of column
and anchored
Column dimension parallel to the beam reinforcement not be less than 20
times bar dia
Transverse reinforcement shall be provided in joint
NED U i i E i i & T h l
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Department of Civil Engineering
NED University Engineering & Technology
INTERMEDIATE MOMENT RESISTING FRAMEBeams
+ve moment strength at joint face should not be less than 1/3 ofve moment
strength
+ve orve moment strength at any section should not be less than 1/5 of
strength at joint face
First hoop provided at 2 in. from face of support
Maximum hoop spacing shall not exceed
d/4
8 times dia of smallest longitudinal bar
24 times dia of hoop bar
12 in
NED U i i E i i & T h l
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Department of Civil Engineering
NED University Engineering & Technology
INTERMEDIATE MOMENT RESISTING FRAMEColumns
Hoops provided at spacing (s) over length (L) from both ends
s should be smallest of
8 times dia of smallest longitudinal bar
24 times dia of hoop bar
of smallest dimension of frame member
12 in
L should be largest of
1/6 of clear span of column
Minimum dimension of column
18 in
NED U i it E i i & T h l
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Department of Civil Engineering
NED University Engineering & Technology
INTERMEDIATE MOMENT RESISTING FRAMEColumns
Hoops provided at spacing (s) over length (L) from both ends
s should be smallest of
8 times dia of smallest longitudinal bar
24 times dia of hoop bar
of smallest dimension of frame member
12 in
L should be largest of
1/6 of clear span of column
Minimum dimension of column
18 in
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