fundamentals of engineering supplied-reference handbook - Ventech!

Bearing strength
LRFD
Design strength (kips/bolt/inch thickness):
φrn = φ 1.2 Lc Fu ≤ φ 2.4 db Fu
φ = 0.75
Lc = clear distance between edge of hole
and edge of adjacent hole, or edge of
member, in direction of force
Lc = s – Dh
Dh Lc = Le –
2
Design bearing strength (kips/bolt/inch thickness)
for various bolt spacings, s, and end distances, Le:
Bearing
strength
φrn (k/bolt/in)
Bolt size
3/4" 7/8" 1"
s = 2 2 /3 db ( minimum permitted )
Fu = 58 ksi 62.0 72.9 83.7
Fu = 65 ksi 69.5
s = 3"
81.7 93.8
Fu = 58 ksi
Fu = 65 ksi
Fu = 58 ksi
Fu = 65 ksi
Fu = 58 ksi
Fu = 65 ksi
78.3 91.3
87.7
Le = 1 1/4"
102
44.0
49.4
Le = 2"
78.3
87.7
40.8
45.7
79.9
89.6
101
113
37.5
42.0
76.7
85.9
The bearing resistance of the connection shall be
taken as the sum of the bearing resistances of the
individual bolts.
125
CIVIL ENGINEERING (continued)
ASD
Design strength (kips/bolt/inch thickness):
When s ≥ 3 db and Le ≥ 1.5 db
rb = 1.2 Fu db
When Le < 1.5 db : rb =
When s < 3 db :
rb =
⎛ d ⎞
⎜ s − ⎟
⎝ 2 ⎠
2
b
Fu
e u
2
F L
≤ 1.2 Fu db
Design bearing strength (kips/bolt/inch
thickness) for various bolt spacings, s, and end
distances, Le:
Bearing
strength
rb(k/bolt/in)
Fu = 58 ksi
Fu = 65 ksi
3/4"
Bolt size
7/8"
s ≥ 3 db and Le ≥ 1.5 db
s = 2 2/3 db
Fu = 58 ksi
Fu = 65 ksi
Fu = 58 ksi
Fu = 65 ksi
52.2
58.5
60.9
68.3
(minimum permitted)
47.1
52.8
55.0
61.6
Le = 1 1/4"
36.3 [all bolt sizes]
40.6 [all bolt sizes]
1"
69.6
78.0
62.8
70.4