conectores de cortante
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CE591 Lecture 10: Composite Beams;
Shear Connectors; Metal Decking
Examples Construction
Metal Deck
Shear Studs and Metal Deck
Modifications to Qn
Limits on Spacing, etc.
Calculation of Positive Design Flexural
Strength
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Metal Deck
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Thickness 16 to 22 gage (~0.064 to ~0.034)
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Puddle welds
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AISC I3.2csteel deck shall be anchored to all
supporting members at a spacing not to exceed 18 (can
be from combination of shear studs and puddle welds)
Deck
manufacturerswill often
specify
placement
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Button-punching deck
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Shear studs and ferrules
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Placing shear studs
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Welded wire fabric (WWF)
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Welded wire fabric
W1.4 x 1.4
6 x 6
Spacing (inches)
diameter of
wire, 10 gage,
d ~ 1/8
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May add reinforcement across girdersAISC C-I3.1 where longitudinal cracking detrimental
to serviceability is likely to occur, slab should be
reinforced..
cr
AA002.0
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Shear Studs and Metal Deck
Ribs parallel to axis of beam Ribs perpendicular toaxis of beam
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wr
Hs hr
Hs =length of stud after welding
Hs hr+ 1-1/2
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Strength of stud connectors for
composite beams
uscpgccscn FARREfAQ '5.0
0.1
0.1
p
g
R
RNo metal deck?
Eq. (I3-3)
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(Easterling, 2007)
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From AISC-LRFD 3rd edition
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AISC Predicted Strength, QN
Exp
erimentalStu
dStrength,Q
e
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(Easterling, 2007)
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(Easterling, 2007)
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(Easterling, 2007)
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5.1r
r
h
w*0.85 if thru deck and ; 1.0 if 5.1
r
r
h
w
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ine htmid 2
ine htmid 2
Rp= 0.75
Rp=
0.6
emid-ht= distance from edge of stud shank to steel deck
web, measured at mid-height of the deck rib, and in the
load bearing direction (i.e. direction of max moment forsimply supported beam
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AISC [16.1-87]
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(Easterling, 2007)
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Limits
wr 2
Hs32 1-1/2
AISC I3.2c ds (based on test results)
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wr 2 For one stud,
+ 4ds for eachadditional stud
If deck rib split
longitudinally and
separated to form
a concretehaunch and
nominal hr1-1/2
(AISC I3.2c)
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Limits, contd.
4 ds
2 ds (recommended)
6 ds (in general)
4 ds(for ribs perpendicular to beam)
8 tsand 36(in any direction)
5 minimum flange width for 2 rows of studs (for stud)
8 minimum flange width for 3 rows of studs (for stud)
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Limits, contd.
fs td 5.2Unless stud placed over web
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Limits, contd.
AISC I3.2d
Lateral cover of 1
for shearconnectors,
except in ribs of
formed steel decks
1/2 reqd, ~1 typ.
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Calculation of Mn
Ribs perpendicular toaxis of beam
LRFD I3.2c
Concrete below top of
deck (in ribs) shall be
neglected for section
properties and
calculation of Ac(strength, etc.)
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Calculation of Mn
Ribs parallel to axis of beam
LRFD I3.2c
Concrete below top of
deck (in ribs) MAY be
included for section
properties (Ix)
and SHALL be
included in calculation
of Ac (strength)
top related