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Anchorage

The document provides specifications for anchor bolts used to connect a pedestal to a concrete surface, including: - The anchor bolts are 3/4 inch in diameter, grade F1554-36 steel with a specified tensile strength of 58 ksi and yield strength of 36 ksi. - The nominal tensile strength of a single anchor bolt is 19.4 kips, and design strength is 14.5 kips after applying a strength reduction factor of 0.75. - Concrete has a specified compressive strength of 4,500 psi. Pedestal sizes range from 24 inches square for a single bolt up to 195 inches square for 4 bolts, depending on the effective embedment

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Richa Munjal
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449 views8 pages

Anchorage

The document provides specifications for anchor bolts used to connect a pedestal to a concrete surface, including: - The anchor bolts are 3/4 inch in diameter, grade F1554-36 steel with a specified tensile strength of 58 ksi and yield strength of 36 ksi. - The nominal tensile strength of a single anchor bolt is 19.4 kips, and design strength is 14.5 kips after applying a strength reduction factor of 0.75. - Concrete has a specified compressive strength of 4,500 psi. Pedestal sizes range from 24 inches square for a single bolt up to 195 inches square for 4 bolts, depending on the effective embedment

Uploaded by

Richa Munjal
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as XLSX, PDF, TXT or read online on Scribd
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Diameter of anchor bolt = 3/4 in

Grade of anchor bolt = F1554-36


cified tensile strength of bolt = 58.0 ksi
pecified yield strength of bolt = 36.0 ksi

Strength reduction factor of ductile steel element


f = 0.75 For tension loads
f = 0.65 For shear loads

Steel Strength of Anchor in Tension


The nominal strength of an anchor in tension, N sa= Ase,Nfuta
Ase,N = 0.334 in2
Nsa = 19.4 kips
The design strength of an anchor in tension, fNsa= 14.5 kips
Specified concrete strength, fc' = 4500 psi
Size of Pedestal
Lx = 32.0 in ca,max = 12.0 in
Lz = 32.0 in ca,max = 12.0 in
Anchor Bolt Spacing
Sx = 8.0 in
Sz = 8.0 in
hef = 32.5 in
1.5hef = 48.8 in
Effective embedment of bolt, hef' = 8.0 in
Based on hef
ANCO = 9506.3 in2
Pedestal size = 97.5 in for 1 bolt
= 195.0 in x 97.5 in for 2 bolts
= 195.0 in x 195.0 in for 4 bolts
Based on hef'
ANCO = 576.0 in2
Pedestal size = 24.0 in x 24.0 in for 1 bolt
= 48.0 in x 24.0 in for 2 bolts
= 48.0 in x 48.0 in for 4 bolts
Based on edge distance
ANC = 256.0 in2 for 1 bolt

Basic concrete breakout strength of single anchor in tension in cracked concrete, N b =

la =
Nb =
Modification factor for eccentricity = ec,N =
Eccentricity, e'N =
ec,N =
ca,min =
Modification factor for edge effect = ed,N =
Cracking factor Yc,N =
Ycp,N =

Concrete Breakout Strength of Anchor in Tension


The nominal concrete breakout strength in tension, Ncb = ANC
ed , N C , N Cp , N N b
ANCO
ANC
ed , N C , N Cp , N N b
ANCO
Ncb = 16.2 kips for single anchor
Ncb = 64.8 kips for group of anchors
Pull Out Strength in Tension
The pull out strength in tension of single headed bolt, N p = 8Abrgfc'
Area of
Bolt Dia (in) hef (in) Abrg (in2) Bolt (in2)
5/8 13 1/2 0.45 0.31
3/4 13 1/2 0.65 0.44
7/8 17 3/4 0.89 0.60
Refer D.4.3 of ACI 318-11 1 17 3/4 1.16 0.79
1 1/4 23 3/4 1.82 1.23
1 1/2 26 2.62 1.77
1 3/4 30 4.14 2.41
2 31 1/2 5.32 3.14
Refer Eq D-2 of ACI 318-11 2 1/4 36 1/4 6.63 3.98
Refer Table 3 of ACI 318-11-SP-17(11)2 2 1/2 40 1/4 8.09 4.91
3 44 11.45 7.07
ca1 = Not Applicable
ANC = Not Applicable for 1 bolt

Based on edge distance


ca1 = 12.0 in
ca1 = 20.0 in ca1 = 12.0 in
ANC = Not Applicable for 1 bolt ANC = 1024.0 in2 for group of bolts

of ACI318-2011

of ACI318-2011

1 for normal weight concrete Refer Cl 8.6.1 & D.3.6 for cast in anchors
36429.44 lb for cast in anchors
1/(1+2e'N/3hef) Refer Eq D-8 of ACI318-2011
0
1
12.0 in = 12.0 in 1.5hef'
1
1 for cast in anchors
1 for cast in anchors Refer D.5.2.7

d ,N C , N Cp , N N b for a single anchor Refer Eq D-3 of ACI 318-11


d ,N C , N Cp , N N b

for single anchor


for group of anchors
Ase,N (in2)
0.23
0.33
0.46
0.61
0.97
1.41
1.90
2.50
0.00
0.00
0.00
for group of bolts

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