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
R in One Rib g 1 1.00 2 0.85 ≥ 3 0.70
Condition
R g w r
≥ 1.5 1.00 h r
w r
< 1.5 0.85 1 h r
1 For a single shear connector .
Connector placement along the beams
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 .
Point loads
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 .
Deflections
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 :
I eff
= I s + n x ( l tr
– l s ) l s
= moment of inertia of steel section n = connection fraction
l tr
= 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