N mag
=
A Na
A Nao ψec , Na ψ ed , Na
N ba , m
N mag
=
248 in . 2 ( 1.0 )( 0.82 )( 8,435 lbs ) 98 in . 2
N mag
= 17,503 lbs
Controlling Design Strength
N ua
=
( 250 lbs ) ϕ steel
N sa
( 0.75 )( 8,230 lbs )
= 4.05 %
N ua
=
( 1,000 lbs ) ϕ masonry
N mbg
( 0.65 )( 9,735 lbs )
= 15.80 %
A Na
= ( c Na + 8 in . + c Na
)( c Na + 2 in . + c Na
+ 2in .)
A Na
= ( 2 ( 4.94 in .) + 8 in .) ( 2 ( 4.94 in .) + 4 in .)
A Na
= 248 in . 2
A Nao
= ( 2c Na
) 2
A Nao
= ( 2 ( 4.94 in .)) 2
A Nao
= 98 in . 2
N ua
( 1,000 lbs ) = = 8.79 % ϕ bond
N mag
( 0.65 )( 17,503 lbs )
SHEAR FAILURE MODES
Steel Failure — Nominal Strength
V sa
= 0.60 A se , V ƒ uta
V sa
= ( 0.60 )( 0.1419 in . 2 )( 58,000 psi )
V sa
= 4,938 lbs ψ ec , Na
= 1.0 ( No Eccentricity Present )
Masonry Breakout Failure — Nominal Strength ψ ed , Na
= 0.7 + 0.3 c a , min
c Na
V mbg
=
A Vm
A Vmo ψec , V , m ψ ed , V , m ψ m , V ψ h , V , m ψ parallel , V , m V b , m ψ ed , Na
= 0.7 + 0.3
2 in . 4.94 in . ψ ed , Na
= 0.82
N ba , m
= т uncr , m πd a h ef
N ba , m
= ( 1,074 psi ) ( π )( 0.5 in . )( 5 in .)
N ba , m
= 8,435 lbs
12 Masonry Fastening Technical Guide Edition 24 Hilti , Inc . 1-800-879-8000 | en español 1-800-879-5000 | www . hilti . com | Hilti ( Canada ) Corporation | www . hilti . ca | 1-800-363-4458