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MFAB Anchorage Assembly

MFAB

Ordinary Moment Frame Anchorage

This product's information may differ depending on the category of use. You are currently viewing details related to Ordinary Moment Frame Anchorage. You can also view product information related to the category: Special Moment Frame Anchorage

Simpson Strong-Tie offers the pre-engineered MFAB anchorage assembly as an alternative to the MFSL. Pre-engineered solutions include additional concrete reinforcement to provide a complete solution meeting the 2009 and 2012 International Building Code requirements for both tension and shear. These solutions require that the column be installed in from the edge of the concrete, on either a slab or curb, and develop the full allowable shear capacity of the frame.

MFAB anchorage assemblies are fully assembled and include a template which allows easy positioning and attachment to forms prior to the pour. Inspection is easy since the head is stamped with the "No Equal" (≠) symbol for identification, bolt length, bolt diameter, and optional "H" for high strength (if specified).

Installation

Concrete must be thoroughly vibrated to ensure full consolidation of the concrete around the assembly.

Related Literature

Product Information Tables

Place anchorage assembly prior to placing rebar. Place top of the fixed nut flush with top of concrete.
Plan View at Curb/Stemwall
Plan View – Curb/Stemwall
Section at Curb/Stem
Section at Curb/Stem
Plan View – Slab on Grade
Plan View – Slab on Grade
Section at Slab on Grade<
Section at Slab on Grade

Ordinary Moment Frame MFAB Shear Anchorage

Table 3.1: Simplified MFAB Shear Anchorage – Minimum Required Reinforcement
MFAB Shear Anchorage – Minimum Required Reinforcement
  1. Anchorage solutions applicable to wind design and seismic design in Seismic Design Category A, B, or C using R ≤ 3.0. For designs based on R = 3.5, see Table 3.2.
  2. Solutions are based on embedment in concrete with minimum f'c = 2,500 psi.
  3. Solutions are based on standard strength MFAB_-__-KT anchorage assembly, except shaded values, where high strength MFAB_-__HS-KT anchorage assembly is required.
  4. MFAB tied anchorage solutions require Strong Frame column to be located in from the edge of slab. For solutions with column at edge of slab, use MFSL.
  5. Ties, hairpins and vertical reinforcing shall be ASTM A615 or A706, Grade 60 reinforcing, and are not supplied by Simpson Strong-Tie. Tie and hairpin installation is shown above.
  6. Stemwall/Curb tied anchorage solutions may also be used for slab on grade installations.
  7. Anchorage solutions are based on maximum shear and tension reactions resulting from the tabulated allowable shear load applied to the frame in combination with the gravity loads noted. For frames with an applied shear less than the allowable load or with additional uplift, see Table 3.2.
  8. See tension anchorage solutions.
Base Plate Plans
c6
C6
c9
C9
c12
C12
c15
C15
Table 3.2: Detailed MFAB Shear Anchorage – Tied Anchor Capacities
Detailed MFAB Shear Anchorage – Tied Anchor Capacities
  1. Seismic includes designs in all Seismic Design Categories and designs using R ≤ 3.0 or R = 3.5.
  2. Solutions are based on embedment in concrete with minimum f'c = 2,500 psi.
  3. MFAB tied and hairpin anchorage solutions require Strong Frame column to be located in from the edge of slab. For solutions with column at edge of slab, use MFSL.
  4. Ties, hairpins and vertical reinforcing shall be ASTM A615 or A706, Grade 60 reinforcing, and are not supplied by Simpson Strong-Tie. Tie and hairpin installation is shown above.
  5. Hairpins must be spaced at 2" o.c. (See above.)
  6. Stemwall/curb tied anchorage solutions may also be used for slab on grade installations.
  7. To select anchorage solution, use shear reactions from Maximum Column Reactions in allowable load tables, or column shear reactions calculated in accordance with allowable load tables, footnote 4.
  8. LRFD capacities may be obtained by multiplying tabulated values by 1.6 for wind or by dividing tabulated values by 0.7 for seismic.
  9. Solutions are base on standard strength MFAB_-__-KT anchorage assembly, except shaded values, where high strength MFAB_-__HS-KT anchorage assembly is required.
  10. See tension anchorage solutions for additional anchor strength requirements. Use high strength MFAB_-__HS-KT anchorage assemblies where required by either tension or shear anchorage.
  11. Also see tension anchorage solutions.