|
ESR-1772 I Most Widely Accepted and Trusted
<br />3.3 Threaded Rods and Reinforcing Bars:
<br />Threaded anchor rods, having diameters of 5/8 inch or 3/4
<br />inch (15.9 or 19.1 mm), must be carbon steel conforming
<br />to a minimum of ASTM Fl 554 Grade 36. The 3/4-inch
<br />(19.1 mm) threaded rods may also be used in a prebent
<br />221/2-degree configuration as described in Section 4.1.2 of
<br />this report. Deformed steel rebars, having sizes No. 5 or
<br />No. 6, must conform to ASTM A615, A616, A617, A706, or
<br />A767.
<br />3.4 Steel Sleeve: The steel sleeve for use in unreinforced
<br />brick masonry walls, Simpson Strong-Tie part No. AST800,
<br />is an 8-inch-long (203 mm) sleeve, formed from AISI 1010
<br />steel, closed at one end with a plastic cap and open on the
<br />other, having outside and inside diameters of 13/16 inch
<br />(20.6 mm) and 11/16 inch (17.5 mm), respectively. The
<br />steel sleeves are used in unreinforced brick masonry walls
<br />as described in Section 4.1.3.In unreinforced brick
<br />masonry walls, the steel sleeve is used in configuration C
<br />only (Figure 1).
<br />3.5 Steel Plate Washer: The steel plate is for use in
<br />unreinforced brick masonry walls as described in Section
<br />4.1.3. The steel plate must be ASTM A36 steel, measuring
<br />6 inches by 6 inches by 3/8 inch thick
<br />(152 mm by 152 mm by 9.5 mm). The steel sleeve is used
<br />in unreinforced brick masonry for configuration C only
<br />(Figure 1).
<br />3.6 Hole Cleaning Equipment: Hole cleaning equipment
<br />consists of hole cleaning brushes and air nozzles.
<br />Brushes must be Simpson Strong-Tie 1-inch-diameter hole
<br />cleaning brushes, identified by Simpson Strong-Tie catalog
<br />number ETB10. Air nozzles and brushes must reach the
<br />bottom of the drilled hole.
<br />3.7 Unreinforced Brick Masonry:
<br />The existing unreinforced masonry walls must have a
<br />minimum nominal thickness of 13 inches
<br />(three wythes of brick). The average in-place mortar shear
<br />strength of the building's unreinforced masonry,
<br />determined in accordance with IEBC Section A106.3.3,
<br />must be no less than 50 psi (345 kPa) net.
<br />4.0 DESIGN AND INSTALLATION
<br />4.1 General:
<br />Three types of anchor assembly are available:
<br />Configuration A (shear anchor or rebar dowel),
<br />Configuration B (221/2-degree combination anchor), and
<br />Configuration C (through-bolt combination anchor):
<br />4.1.1 Configuration A, Threaded Rods or Steel
<br />Reinforcing Bars in Shear (Shear Anchor or Rebar
<br />Dowel): Configuration A consists of a 3/4-inch-diameter
<br />(19.1 mm) straight threaded rod or a No. 5 or No. 6,
<br />straight deformed steel reinforcing dowel bar, and a 31/32
<br />inch-outer-diameter-by-8-inch-long (24.6 mm by 203 mm)
<br />steel wire (ETS758) or plastic mesh (ETS758P) screen
<br />tube. This anchor must be embedded a minimum of 8
<br />inches (203 mm) into the wall and is used when the
<br />outside wall is inaccessible. This anchor configuration
<br />resists shear loads only. Figure 1 shows details of an
<br />installed shear-resisting assembly.
<br />4.1.2 Configuration B, Bent Threaded Rods in Shear
<br />or Tension (221/2-degree Combination Anchor):
<br />Configuration B consists of a 3/4-inch-diameter (19.1 mm)
<br />threaded rod prebent at a 22.5-degree angle and installed
<br />a minimum of 13 inches (330 mm) into the wall at a
<br />downward angle of 22.5 degrees, to within a maximum of 1
<br />inch (25.4 mm) of the exterior wall surface. The prebent
<br />Page 2 of 6
<br />threaded rod is used with a 31/32-inch-outer-diameter-by-
<br />13-inch-long (26.4 mm by 330 mm) steel wire (ETS7513)
<br />or plastic mesh (ETS7513P) screen tube. This anchor
<br />configuration resists tension and shear loads, and is used
<br />where the outside of the wall is inaccessible.
<br />4.1.3 Configuration C, Through-bolts in Tension and
<br />Shear: Configuration C consists of a 5/8-inch-diameter
<br />(15.9 mm) threaded rod; an 8-inch-long (203 mm) steel
<br />sleeve (AST800), formed from AISI 1010 steel, having
<br />outside and inside diameters of 13/16 inch 20.6 mm) and11/16 inch (17.5 mm), respectively; and a 1/32-inch-outer-
<br />diameter-by-8-inch-long (26.4 mm by 203 mm) steel
<br />screen tube (ETS758). A 6-inch-by-6-inch-by-3/8-inch-thick
<br />(152 mm by 152 mm by 9.5 mm) ASTM A36 steel plate
<br />must be located on the back face of the wall at the end of
<br />the threaded rod of the through-bolted connection. This
<br />anchor configuration resists tension and shear loads, and
<br />is used when the outside surface of the wall is accessible.
<br />4.2 Design:
<br />The SET adhesive anchors are intended to resist only
<br />short-term loads imposed by wind or earthquake. The
<br />anchors must be approved by a registered design
<br />professional and installed under special inspection in
<br />accordance with Section 4.5 of this report. The edge
<br />distance and vertical and horizontal spacing for the three
<br />types of anchor assemblies described in Section 4.1 must
<br />comply with Table 2.
<br />Conditions of acceptance for threaded rods and
<br />reinforcing bars in unreinforced brick masonry are as
<br />follows:
<br />4.2.1 Configuration A, Threaded Rods or Steel
<br />Reinforcing Bars in Shear (Shear Anchor or Rebar
<br />Dowel):
<br />a. Installation of Configuration A threaded rods and
<br />reinforcing bars intended to resist shear loads only
<br />must comply with Sections 4.1.1 and 4.3, and
<br />Figure 1.
<br />b. The allowable shear load for the 3/4-inch-diameter
<br />(19.1 mm) threaded rod is 1,000 pounds (4450 N) as
<br />shown in Table 3. For the No. 6 and No. 5 reinforcing
<br />bars, the allowable shear loads are 1,000 and 750
<br />pounds (4450 N and 3335 N), respectively, as shown
<br />in Table 3. No adjustment for wind or earthquake
<br />loading is permitted with the above-noted loads.
<br />c. Allowable shear value is applicable only to anchors
<br />installed in walls where in-place shear tests indicate a
<br />minimum mortar strength of 50 psi (345 kPa) net, in
<br />accordance with IEBC Section A106.3.3.
<br />4.2.2 Configuration B, Bent Threaded Rods, and
<br />Configuration C, Through-bolts:
<br />a. Installation of threaded rods and through-bolts must
<br />comply with Sections 4.1.2, 4.1.3 and 4.3, and
<br />Figure 1.
<br />b. Maximum allowable tension load for the 3/4-inch-
<br />diameter (19.1 mm)prebent threaded rod
<br />(Configuration B) or the 5/8-inch-diameter (15.9 mm)
<br />through-bolt (Configuration C) is 1,200 pounds
<br />(5340 N), as shown in Table 3. No adjustment for
<br />wind or earthquake loading is permitted with the
<br />above-noted loads.
<br />c. The maximum allowable shear load for the 3/4-inch-
<br />diameter (19.1 mm) prebent threaded rod is 1,000
<br />pounds (4450 N), and for the 5/8-inch (15.9 mm)
<br />through-bolt it is 750 pounds (3335 N), as shown in
|