ICC ESR-2795 for Low-Velocity Power-Actuated X-DR, X-DR MX and X-HS Rod Hanger Assemblies

ESR-2795
|
Most Widely Accepted and Trusted Page 2 of 11
used to attach the galvanized steel coupler to the bracket.
The galvanized steel coupler has an internal threaded hole
of
1
/
4
-inch-diameter (6.4 mm) to accommodate connection
of a rod.
3.2.3 Rods: The rods are galvanized steel. Smooth and
threaded rods of various lengths are available. One end of
each smooth rod is threaded to match the threads in the
coupler. The smooth rods have a nominal diameter of 0.215
inch (5.45 mm) and a minimum tensile strength of
87 ksi (600MPa). The threaded rods have a 1/4-20 UNC-2A
thread [minor diameter of 0.189 inch (4.8 mm)] and a
minimum tensile strength of 87 ksi (600MPa). The rods are
supplied with a plastic cap at the unconnected end.
3.3 X-HS Threaded Rod Hanger Assembly:
The Hilti X-HS threaded rod hanger assembly is intended to
resist tension, shear, and combined tension and shear
loads. The assembly consists of a Hilti X-U low velocity,
power-actuated fastener (addressed in ESR-2269
) with two
premounted washers (one of zinc-plated steel, one of
plastic), and a premounted cold-formed steel bracket
(threaded rod hanger) having a
1
/
4
- or
3
/
8
-inch-diameter (6.4
or 9.5 mm) internally threaded hole to accommodate
connection of
1
/
4
- or
3
/
8
-inch-diameter (6.4 or 9.5 mm) UNC
threaded steel rods, respectively. The X-HS U19 and
X-HS U32 hanger assemblies described in this report,
include Hilti X-U19 and X-U32 fasteners, respectively,
addressed in
ESR-2269. The X-U19 and X-U32 fasteners
have shank lengths of 0.75 inch (19 mm) and 1.26 inches
(32 mm), respectively. The threaded rod hangers are
manufactured from mild carbon steel with a zinc coating in
accordance with Hilti’s specifications. See Figure 3 for an
illustration of the X-HS threaded rod hanger assembly.
3.4 X-MW ALH Wire Hanger Assemblies:
The Hilti X-MW ALH wire hanger assemblies are intended
to resist tension and combined tension and shear loads. The
assemblies consist of an X-ALH low velocity, power-
actuated fastener with a premounted steel clip, and a length
of wire rope which is attached at the manufacturing facility.
Available variations of the Hilti X-MW ALH wire hanger
assemblies are described in Table 4. A loop lock or channel
lock mechanism (designated L or CL, respectively) is
supplied with each clip assembly. Clip assemblies are
supplied in packages of 30. See Figure 4 for an illustration
of an X-MW AL wire hanger assembly.
3.4.1 Clip: The steel clip is manufactured from zinc-coated
cold-formed steel complying with Hilti’s specifications. The
clip has a tear-shaped hole with a nominal diameter of 0.3
inch (7.5 mm) through which the wire is attached.
3.4.2 Fastener: The X-ALH fasteners are formed from
carbon steel and are heat-treated to a nominal core
hardness of 58 HRC. The fasteners have a smooth tapered
shank, with a nominal diameter beyond the taper of 0.177
inch and a head diameter of 0.322 inch. The shank length is
0.87 inch (22 mm) for the X-ALH22 fastener, 1.06 inch (27
mm) for the X-ALH27 fastener and 1.26 inch (32 mm) for the
X-ALH32 fastener. The fastener has a zinc coating and is
assembled with a plastic washer.
3.4.3 Wire Rope: A length of wire rope is looped through
the hole in the clip and crimped together with a ferrule. The
wire rope complies with ASTM A1023 and has a 7x7 strand
structure with an outer diameter of 2 mm. Available lengths
are shown in Table 4.
3.5 X-MW MX Wire Hanger Assemblies:
The Hilti X-MW MX wire hanger assemblies are intended to
resist tension loads only. Each assembly consists of a steel
bracket with a length of wire rope which is attached at the
manufacturing facility. The bracket must be installed with a
power-actuated fastener, which is supplied separately. A
loop lock mechanism is supplied with each bracket.
Brackets are supplied in packages of 30. See Figure 5 for
an illustration of the X-MW MX wire hanger assembly
3.5.1 Bracket: The steel bracket is manufactured from
zinc-coated cold-formed steel complying with Hilti’s
specifications. The steel is bent to produce a uniquely
shaped bracket. The long leg of the bracket has a hole with
a nominal diameter of 0.169 inch (4.3 mm) to accommodate
the field installed power-actuated fastener. The short leg of
the bracket has a hole through which the wire is attached.
3.5.2 Wire Rope: A length of wire rope is looped through
the hole in the short leg of the bracket and crimped together
with a ferrule. The wire rope complies with ASTM A1023 and
has a 7x7 strand structure with an outer diameter of 2 mm.
Available lengths are 6 feet (2 m),
10 feet (3 m) and 20 feet (6 m).
3.5.3 Fastener: Each bracket must be installed with a Hilti
X-S 14 B3 or X-P 20 B3 fastener, which are addressed in
ESR-1752.
3.6 Substrate Materials:
3.6.1 Steel: Structural steel used in supports must comply
with the minimum strength requirements of
ASTM A36, A572 Grade 50 or A992, and must have a
minimum thickness of
3
/
16
-inch (4.76 mm).
3.6.2 Concrete: Normalweight and sand-lightweight
concrete must comply with IBC Chapter 19 or IRC Section
R402.2, as applicable. The minimum concrete compressive
strength at the time of fastener installation must be as noted
in the applicable allowable load table.
3.6.3 Steel Deck Panels: Steel deck panel properties and
configurations must be as described in the footnotes to
Table 3. See Figures 10 through 13 for panel configuration
requirements.
4.0 DESIGN AND INSTALLATION
4.1 Design:
4.1.1 Allowable Loads: The allowable tension, shear and
45-degree-angle loads for X-DR, X-DR MX and X-HS rod
hanger assemblies and X-MW MX wire hanger assemblies
installed into steel are provided in Table 1. The allowable
tension, shear and 45-degree-angle loads for
X-DR, X-DR MX and X-HS rod hanger assemblies and
X-MW ALH and X-MW MX wire hanger assemblies installed
into normalweight concrete are provided in Table 2. The
allowable tension, shear and 45-degree-angle loads for X-
DR, X-DR MX and X-HS rod hanger assemblies and
X-MW ALH and X-MW MX wire hanger assemblies installed
into sand-lightweight concrete and into sand-lightweight
concrete filled steel deck panels are provided in Table 3.
The most critical applied loads, excluding seismic load
effects, resulting from the load combinations in Section 2.4
of ASCE 7-16/S1 (referenced in 2021 IBC Section 1605.1)
or 2021 IBC Section 1605.2 (Section 1605.3.1 or 1605.3.2
of the 2018, 2015, 2012 and 2009 IBC) must not exceed the
allowable loads. For assemblies subjected to seismic loads,
see Section 4.1.3 for additional information. The stress
increases and load reductions described in 2021 IBC
Section 1605.2 (2018, 2015, 2012 and 2009 IBC Section
1605.3) are not allowed.
Allowable loads apply to the connection of the X-DR,
X-DR MX and X-HS Hanger Assembly to the base material
only with threaded rod installed; and to the connection of the
X-MW ALH and X-MW MX wire hanger assemblies to the
base material only. Design of the connection of the hanger
assemblies to the suspended materials must comply with
the applicable requirements of the IBC.