Product Technical Guide Supplement for Seismic Bracing per NFPA 13 April 2020

April 2020

Design Tables for Pre-calculated Horizontal Earthquake Load

The design tables starting on page 7 determine the maximum horizontal load, F

, that will satisfy NFPA 13-16 Eq. A.9.3.5.12.2a,

for various Hilti post-installed and cast-in anchors used in conjunction with various seismic brace swivel attachments to attach the

sway brace to concrete.

Notes:

• T

allow

and V

allow

used as the calculation basis for F

in the tables are determined from a strength design calculation according to

ACI 318-14 Ch. 17 and converted to allowable values per NFPA 13-16 A.9.3.5.12.8.3(D).

• Anchor calculation assumes cracked concrete condition and seismic design category C through F.

• Minimum edge distance noted in tables assumes a single anchor with one nearby edge with the shear load perpendicular toward

the edge. For an anchor in a corner, the distance to the edge parallel to the direction of the shear must be at least 1.5 times the

minimum edge distance noted in the table.

• Minimum spacing distance noted in tables assumes two anchors in the middle of the concrete with no edge distance reductions.

• Seismic brace swivel attachment prying factors noted in the tables are from data published according to the following documents

• Hilti MQS-SP-L-1/2” and MQS-SP-T-1/2” seismic hinge prying factors taken from Hilti Statement on the Prying Factors in

regard to Hilti Seismic hinge (all sizes) technical document, dated November 18, 2019.

• Tolco™ Figure 909, 910, and 980 swivel brace attachment prying factors taken from Seismic Bracing Anchor Load Charts

B-Line series technical publication no. BR309004EN, dated October 2019

• Afcon™ AF075, AF076, AF077, and AF771 swivel brace attachment prying factors taken from Anvil International Pipe

Hangers and Supports technical publication no. 165, with a revision date of January 29, 2018.

• The above noted documents are subject to change and only valid for the dates listed in the referenced documents.

• TOLCO™ trademark is owned by Eaton Corporation plc.

• AFCON™ trademark is owned by Anvil International LLC.

• Prying factors are provided that give the highest value for the given angle category. The corresponding value of P

and F

will be

conservative for the other angles within the angle category.

• For angle categories D to I, the angle, θ, is selected that leads to the highest value for the applied shear load, V. The

corresponding value of F

will be conservative for the other angles within the angle category. θ = 30° for Angle D and G, θ = 45°

for Angle E and H, and θ = 60° for Angle F and I.

• F

does not consider the adequacy of the seismic hinge or other components of the sway bracing or vertical hanger. The design

engineer of record must ensure all components are suitable for the application and design loads.

• Prying factors noted for the attachment to concrete over metal deck assume the seismic swivel brace has its full bearing area in

contact with the metal deck.

• Values in tables are applicable for noted concrete compressive strength and for concrete with higher compressive strengths.

• For applications outside of the above noted parameters, contact Hilti for assistance.