Masonry Anchor Strength Design Guide 2024
V b , m
= MIN [ V b , m1 ; V b , m2
]
V b , m1
= ( 7 )
MIN [ 8d a ; h ef
]
0.2 d a d a ƒ ́m ( c a1
) 1 . 5
V b , m1
= ( 7 )
4 in .
0.2
0.5 in .
0.5 in . 1,500 psi ( 2 in .) 1 . 5
V b , m1
= 822 lbs
V b , m2
= 9 ƒ ́m ( c a1 ) 1 . 5 = 9 1,500 psi ( 2 in .) 1 . 5
V b , m2
= 986 lbs
V b , m
= MIN [ 822 lbs ; 986 lbs ] = 822 lbs
|
A vm
= ( 2 ( 1.5c a1
+ 1.5c a1 ) )( MIN [ h ; 1.5c a1
)
|
|
|
|
|
A Vm
= ( 2 ( 6 in .)) ( MIN [ 7.625 in . ; 3 in . ])
|
V mbg
=
|
A Vm |
ψec
, V , m ψ ed , V , m ψ m , V ψ h , V , m ψ parallel , V , m V b , m
|
|
A Vm
= 36 in . 2
|
|
A Vmo |
|
A Vmo
= 4.5 X ( c a1
) 2
A Vmo
= 4.5 x ( 2 in .) 2
V mbg
=
36 in . 2 ( 1.0 )( 1.0 )( 1.4 )( 1.0 )( 1.0 )( 822 lbs ) 18 in . 2
V mbg
= 2,302 lbs
A Vmo
= 18 in . 2 ψ ec , v , m
= 1.0 ( No Eccentricity Present )
ψ ed , v , m
= 1.0 ( Since c a2
≥ 1.5c a1 ) ψ m , V
= 1.4 ( Uncracked Masonry )
Masonry Pryout Failure — Nominal Strength
V mpg
= k cp ( MIN N mbg
; N mag ])
V mpg
= ( 2.0 ) ( MIN [ 9,735 lbs ; 17,503 lbs ])
V mpg
= 19,470 lbs
Masonry Crushing Failure — Nominal Strength
V mc
= ( 1750 ) ( 4 ƒ ́mA se , V ) ψ h , V , m
= 1.0 ( Since h a
≥ 1.5c a1 )
V mc
= ( 1750 ) ( 4 ( 1,500 psi )( 0.1419 in . 2 ) )
V mc
= 6 , 684 lbs ψ parallel , V , m
= 1.0
( Since Shear Load is Perpendicular to Hollow Head Joint Edge )
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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