Bolt Tensile Prying Action on End Plate
ratio = 4.17 / 6.91
= 0.60
PASS
Bolt group forces
shear V
= 50.00
[kips]
axial P
= -25.00
[kips]
Single Bolt Tensile Capacity Without Considering Prying
Bolt grade
grade
= A325-N
Nominal tensile/shear stress
Fnt
= 90.0
[ksi]
Fnv
= 54.0
[ksi]
AISC 14th Table J3.2
bolt dia db
= 0.750
[in]
bolt area Ab
= 0.442
[in2]
Bolt group shear force
shear V
= 50.00
[kips]
no of bolt n
= 6
Shear stress required
frv
= V / ( n Ab )
= 18.86
[ksi]
Resistance factor-LRFD
φ
= 0.75
AISC 14th J3.7
Modified nominal tensile stress
F'nt
= 1.3 F
nt -
Fnt/φ Fnv
f
rv ≤ F
nt = 75.08
[ksi]
AISC 14th Eq J3-3a
Bolt norminal tensile strength
rn
= F'nt Ab
= 33.17
[kips]
AISC 14th Eq J3-1
Resistance factor-LRFD
φ
= 0.75
AISC 14th J3.6
Single bolt tensile capacity
φ rn
=
= 24.88
[kips]
Single Bolt Tensile Capacity After Considering Prying
End plate
width w
= 6.750
[in]
bolt gage g
= 4.000
[in]
web tw
= 0.260
[in]
Dist from bolt center to plate edge
a
= 0.5 (w - g)
= 1.375
[in]
a'
= a + 0.5 db ≤ (1.25 b + 0.5 db )
= 1.750
[in]
AISC 14th Eq 9-27
Bolt hole diameter
bolt dia db
= 0.750
[in]
bolt hole dia dh
= 0.813
[in]
AISC 14th B4.3b
Dist from bolt center to face of web
b
= 0.5(g - tw )
= 1.870
[in]
b'
= b - 0.5 db
= 1.495
[in]
AISC 14th Eq 9-21
Bolt pitch spacing
sv
= 3.000
Bolt tributary length
p
= sv p ≤ 2b and p ≤ sv
= 2.917
[in]
AISC 14th Page 9-11
ρ
= b' / a'
= 0.854
AISC 14th Eq 9-26
δ
= 1 - dh / p
= 0.721
AISC 14th Eq 9-24
Tensile capacity per bolt before considering prying
B
= from calc shown in above section
= 24.88
[kips]
Resistance factor-LRFD
φ
= 0.90
AISC 14th Page 9-10
End plate thickness
t
= 0.375
[in]
tensile Fu
= 65.0
[ksi]
Plate thickness req'd to develop bolt tensile capacity without prying
tc
= 0.934
[in]
AISC 14th Eq 9-30a
α'
=
1/δ (1 + ρ )
[ (
tc/t
)
2 - 1 ]
= 3.887
AISC 14th Eq 9-35
when α' > 1
Q
= 0.278
AISC 14th Eq 9-34
Bolt tensile force per bolt in demand
T
= from calc shown below
= 4.17
[kips]
Tensile strength per bolt after considering prying
φ rn
= B x Q
= 6.91
[kips]
AISC 14th Eq 9-31
ratio
= 0.60
> T
OK
Calculate Max Single Bolt Tensile Load
Bolt group force
axial P
= 25.00
[kips]
Bolt number
Bolt Row nh
= 2
Bolt Col nv
= 3
Bolt tensile force per bolt
T
= P / ( nv nh )
= 4.17
[kips]