Anchor Bolt Reinforcement Check
Anchor Bolt Reinforcement Check
Anchor Bolt Reinforcement Check
Edge Distance :
c a1 = 250 mm
c a2 = 250 mm
Anchor Spacing :
(cct)
s1 = 300 mm
s2 = 300 mm
Steel Strength of Group of Anchor in Shear : V*Vsag = V * na * 0.8 * 0.6 * Ase * futa (D-29)
= 201.0 kN > 107.0 kN, OK!
V = 0.65 Shear Reduction Factor Ratio = 0.53
299.8 kN 34.4 kN
Case + = 0.79 < 1.20 , OK!
483.2 kN 201.0 kN
287.1 kN 107.0 kN
Case + = 1.13 < 1.20 , OK!
483.2 kN 201.0 kN
Because of symmetry, only one side-face blowout resistance on one face of the pedestal needs to be
considered.
Tu/4 = 74.9 kN , factored tension force per one anchor bolt
Check if the corner effect (for the corner anchor) and close spacing (for the group of anchors) have to be
considered:
corner effect : ca2 < 3*ca1 ---> consider corner effect
corner effect factor = (1 + ca2 / ca1) /4 , - where 1.0 < ca2/ca1 < 3.0
= 0.50
0.50
sb*Nsb = sb * [13 * ca1* (Abrg) ] * a * f'c * [(1+ ca2/ca1) / 4] (D-16)
= 187.2 kN > 74.9 kN
Ratio = 0.40 a = 1.0 (D.5.3.6)
sb = 0.70 Side-face blowout Reduction Factor
close spacing effect : s1 < 6ca1---> Consider close spacing effect
close spacing factor = 1 + s1 / (6 * ca1)
= 1.20
sb*Nsbg = sb * Nsb * [1 + s1 / (6 * ca1)], for two anchors on one face of the pedestal (D-17)
= 224.6 kN > 149.9 kN
Ratio = 0.67
7. Transfer of Anchor Load to Vertical Re-bars
To be considered effective, pedestal main rebar shall be placed at a minimum distance of 0.50*hef
from anchor bolt.
checking : 0.50*hef = 230 mm > g, rebar is effective!
Pedestal Main Rebar Data :
diameter, db = d16
2
Area of One Rebar, Ar = 201 mm
No. of Effective Bars, n = 16
cct
cct = 50 mm
g= 110 mm
Ld' hef = 460 mm
L3 = 570 mm
Ld'= hef - cct - 0.68g
= 335 mm
Note : L3 is the straight bar
development length in tension
per sec. 12.2. Refer to drawing
no. 1TA-NC-XCSV2-0002 (3/6).