Steel Deck Fastening Systems
1.7 X-HVB Shear Connector
Strength reduction factors for concrete over metal deck composite floor slabs
Ribs perpendicular to the beam
Ribs parallel to the beam
Number of X-HVB's
in One Rib R g 1 1.00 w r
2 0.85 h r
≥ 3 0.70 w r
h r
Condition R g
≥ 1.5 1.00
< 1.5 0.85 1
1 For a single shear connector.
Connector placement along the beams Deflections
The ductile performance of the Hilti X-HVB Shear Connector
allows distribution of the calculated required number of
X-HVB’s uniformly between the points of zero and maximum
moment. Beam deflections are computed by conventional elastic
formulas. For beams with partial shear connection, deflections
may be estimated by using the following formula for the
effective moment of inertia:
Point loads I eff =
l s =
n =
l tr =
Application of large point loads causes abrupt changes in
shear. To avoid excessive slip, additional X-HVB connectors
may be necessary between the point load and the support.
Partial shear connection
AISC-LRFD and AISC-ASD both require that the capacity
of the installed shear connectors must be no less than 25%
of the calculated shear load for full composite design. This
requirement is applicable, independent of whether welded
studs or X-HVB’s are used for the shear connection.
I s + n x ( l t r – l s )
moment of inertia of steel section
connection fraction
moment of inertia with 100% connection
Continuous beams
Hilti X-HVB Shear Connectors are also suitable for use in
continuous composite beams. The connectors are distributed
uniformly between the point of zero moment and the point of
maximum moment.
To obtain access to Hilti’s BDES Composite Design Software, which designs and analyzes composite and
non-composite beams using Hilti X-HVB Shear Connectors under distributed and point loads in accordance
with AISC LRFD, contact Hilti Technical Support at 1-877-749-6337.
62 Hilti, Inc. (US) 1-800-879-8000 | www.us.hilti.com I en español 1-800-879-5000 I Hilti (Canada) Corp. 1-800-363-4458 I www.hilti.ca I PTG Decking Supplement 2014