Masonry Anchor Strength Design Guide 2024
TENSION FAILURE MODES
Steel Failure — Nominal Strength ψ ec , N , m
= 1.0 ( No Eccentricity Present )
N sa
= A se , N ƒ uta
N sa
= ( 0.1419 in . 2 )( 58,000 psi )
N sa
= 8,230 lbs
Masonry Breakout Failure — Nominal Strength ψ ed , N , m
= 0.7 + 0.3
ψ ed , N , m
= 0.7 + 0.3 c a , min
1.5h ef
2 in . 7.5 in .
N mbg
= A Nm
A Nmo ψ ec , N , m ψ ed , N , m ψ c , N , m
N b , m ψ ed , N , m
= 0.78 ψ c , N , m
= 1.0 ( Found in ESR )
N b , m
= k m , uncr ƒ ́m ( h ef
) 1 . 5
N b , m
= ( 17 ) ( 1,500 psi ) ( 5 in .) 1 . 5
N b , m
= 7,361 lbs
N mbg
=
368 in . 2 ( 1.0 )( 0.78 )( 1.0 )( 7,361 lbs ) 225 in . 2
N mbg
= 9,735 lbs
A Nm
= ( 1.5h ef + 8 in . + 1.5h ef
) ( 6 in . + 2 in . + 6 in . + 2 in .)
Bond Failure — Nominal Strength
|
A Nm
= ( 7.5 in . + 8 in . + 7.5 in .)( 16 in .)
|
N mag
=
|
A Na |
ψec
, Na ψ ed , Na
N ba , m
|
|
|
A Nao |
|
|
A Nm
= 368 in . 2
|
|
|
|
A Nmo
= 9 x ( h ef
) 2
A Nmo
= 9 × ( 5 in .) 2 c Na
= 10d a c Na
= 10 ( 0.5 in .) т uncr , m 1,100 psi
1,074 psi 1,100 psi
A Nmo
= 225 in . 2 c Na
= 4.94 in .
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
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