Simpson Strong-Tie offers the pre-engineered OMFSL anchorage assembly to make specification and installation of anchorage as simple as possible. The unique shear-lug design provides a complete solution meeting the 2006 and 2009 International Building Code requirements for both tension and shear. These solutions allow for column installation flush with the edge of the concrete, on either a slab or curb, and develop the full allowable shear capacity of the frame.

OMFSL 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 around the shear lug to ensure full consolidation of the concrete around the assembly.

Available in hot dipped galvanized. Contact Simpson Strong-Tie for details.

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 2.3.
2. See footnotes 2 and 3 of Allowable Load tables for explanation of Maximum Shear and Minimum Shear, and corresponding gravity loads.
   CLOSE (x)

   2. Maximum Shear is allowable horizontal shear force, V, applied in combination with the following allowable stress design uniform gravity loads: w = 800-plf dead load, 400-plf floor live load, and 400-plf roof live load. Seismic load combinations assume S_DS=1.0 to determine E_v. Where S_DS>1.0, check that (1.0 + 0.14S_DS)D is less than 800 plf. Where gravity loads exceed any of these values, use Minimum Shear loads (see Note 3).
   3. Minimum Shear is allowable horizontal shear force, V, applied in combination with the maximum total vertical load, W_max, which may be applied as a single point load at midspan, P=W_max, as multiple point loads applied symmetrically about mid-span of the beam,P₁+P₂+…+P_i=W_max, or as a uniform distributed load, w_max = W_max/L_beam.   W_max shall be determined based on the governing load combination of the applicable building code, and shall include E_v for seismic loads

3. Solutions are based on embedment in concrete with minimum f'c = 2,500 psi.
4. Solutions are based on standard strength OMFSL_-__-KT anchorage assembly, except shaded values, where high strength OMFSL_-__HS-KT anchorage assembly is required.
5. Shear lug is included with OMFSL anchorage assembly.
6. The following end distances correspond to pre-installed wood nailer flush with end of concrete: (see Base Plate Plans)
   C6     4 1/2"
   C9     4 1/2"
   C12   6"
   C15   7 1/2"
7. End distance is measured from centerline of nearest anchor bolt to edge of concrete.
8. Outside End Distance and Inside End Distance are shown above.
9. See Table 2.2 or 2.3 for additional solutions with OMFSL anchorage assembly. See Tables 3.1 and 3.2 for solutions with OMFAB anchorage assembly.
10. 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 2.2 or 2.3.
11. Also see tension anchorage solutions.

1. Seismic includes designs in all Seismic Design Categories and designs using R ≤ 3.0 or R = 3.5.
2. Shear lug is included with OMFSL anchorage assembly.
3. End distance is measured from centerline of nearest anchor bolt to edge of concrete. Outside End Distance and Inside End Distance are shown above.
4. First load value listed for each column corresponds to pre-installed wood nailer flush with end of concrete (see base plate plans).
5. Designer may linearly interpolate for end distances between those listed.
6. LRFD capacities may be obtained by multiplying tabulated values by 1.6 for wind or by dividing tabulated values by 0.7 for seismic.
7. Solutions are based on standard strength OMFSL_-__-KT anchorage assembly, except values, where high strength OMFSL_-__HS-KT anchorage assembly is required (see footnote 12). Standard strength OMFSL used in place of high stength OMFSL have an allowable shear of 5,110 lbs. for wind and 5,725 lbs. for seismic for C6 columns, and 10,225 lbs. for wind and 11,450 lbs. for seismic for all other column sizes.
8. 8" stemwall/curb: For wind design and seismic design with R≤3.0, 8-ft tall OMF models, 9-ft tall OMF912, OMF1212, and OMF1512, and 10-ft tall OMF1212 and OMF1512 installed with nailer flush with inside end of curb may not achieve full allowable load and may require additional interior end distance. For seismic designs with R = 3.5, 8-ft, 9-ft, 10-ft, and 12-ft tall OMF models, 14-ft tall OMF912, OMF1212, and OMF1512, and 16-ft tall OMF1212 and OMF1512 installed with nailer flush with inside end of curb may not achieve full allowable load and may require additional interior end distance. Designer to verify. All other OMF models achieve full allowable load when installed with nailer flush with inside end of curb.
9. 10" stemwall/curb: For wind design and seismic design with R≤3.0, OMF912-8x8, OMF1212-8x9, OMF1512-8x9, and 8-ft tall OMF612, OMF1212, and OMF1512 installed with nailer flush with inside end of curb may not achieve full allowable load and may require additional interior end distance. For seismic designs with R = 3.5, OMF912-8x12, OMF1212-8x14, OMF1512-8x14, OMF1512-10x14, 8-ft, 9-ft, and 10-ft tall OMF models, and 12-ft tall OMF1212 and OMF1512 installed with nailer flush with inside end of curb may not achieve full allowable load and may require additional interior end distance. Designer to verify. All other OMF models achieve full allowable load when installed with nailer flush with inside end of curb.
10. See tension anchorage solutions for additional anchorage assembly strength requirements. Use high strength OMFSL_-__HS-KT anchorage assembly where required by either shear or tension anchorage.
11. Also see tension anchorage solutions.
12. Solutions are based on standard strength OMFSL_-_-KT anchorage assembly, except shaded values, where high strength OMFSL_-_HS-KT anchorage assembly is required.

1. Seismic includes designs in all Seismic Design Categories and designs using R ≤ 3.0 or R = 3.5.
2. Shear lug is included with OMFSL anchorage assembly.
3. End distance is measured from centerline of nearest anchor bolt to edge of concrete. Outside End Distance and Inside End Distance are shown above.
4. First load value listed for each column corresponds to pre-installed wood nailer flush with end of concrete (see base plate plans).
5. Designer may linearly interpolate for end distances between those listed.
6. LRFD capacities may be obtained by multiplying tabulated values by 1.6 for wind or by dividing tabulated values by 0.7 for seismic.
7. Solutions are based on standard strength OMFSL_-__-KT anchorage assembly, except values, where high strength OMFSL_-__HS-KT anchorage assembly is required (see footnote 12). Standard strength OMFSL used in place of high stength OMFSL have an allowable shear of 5,110 lbs. for wind and 5,725 lbs. for seismic for C6 columns, and 10,225 lbs. for wind and 11,450 lbs. for seismic for all other column sizes.
8. 8" stemwall/curb: For wind design and seismic design with R≤3.0, 8-ft tall OMF models, 9-ft tall OMF912, OMF1212, and OMF1512, and 10-ft tall OMF1212 and OMF1512 installed with nailer flush with inside end of curb may not achieve full allowable load and may require additional interior end distance. For seismic designs with R = 3.5, 8-ft, 9-ft, 10-ft, and 12-ft tall OMF models, 14-ft tall OMF912, OMF1212, and OMF1512, and 16-ft tall OMF1212 and OMF1512 installed with nailer flush with inside end of curb may not achieve full allowable load and may require additional interior end distance. Designer to verify. All other OMF models achieve full allowable load when installed with nailer flush with inside end of curb.
9. 10" stemwall/curb: For wind design and seismic design with R≤3.0, OMF912-8x8, OMF1212-8x9, OMF1512-8x9, and 8-ft tall OMF612, OMF1212, and OMF1512 installed with nailer flush with inside end of curb may not achieve full allowable load and may require additional interior end distance. For seismic designs with R = 3.5, OMF912-8x12, OMF1212-8x14, OMF1512-8x14, OMF1512-10x14, 8-ft, 9-ft, and 10-ft tall OMF models, and 12-ft tall OMF1212 and OMF1512 installed with nailer flush with inside end of curb may not achieve full allowable load and may require additional interior end distance. Designer to verify. All other OMF models achieve full allowable load when installed with nailer flush with inside end of curb.
10. See tension anchorage solutions for additional anchorage assembly strength requirements. Use high strength OMFSL_-__HS-KT anchorage assembly where required by either shear or tension anchorage.
11. Also see tension anchorage solutions.
12. Solutions are based on standard strength OMFSL_-_-KT anchorage assembly, except shaded values, where high strength OMFSL_-_HS-KT anchorage assembly is required.