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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)