1.
Input Data f'c =
28 Mpa
f uta =
400 400 Mpa
Yield strength of anchor
f ya =
248 248 Mpa
Anchor bolt diameter
da =
Nos of thread
nt =
Compressive strength of concrete Ultimate strength of anchor
76.2 76.2 mm 8 thread threadss per inch inch
nt =
0.315 threads threads per millime millimeter ter
Depth of embedment
hef =
1275 1275 mm
Distance from edge
ca1 =
385 mm
Width of anchor plate Thickness of anchor plate Width across flat for nut head
W= B= F=
150 12 4.625 117. 117.47 475 5
mm mm in inch mm
Note: (*) = ACI 318M-2014
2.
Anch Anchor or Stre Streng ngth th for for Tens Tensio ion n Load Load
2.1 2.1 Stre Streng ngth th of of an anch anchor or The nominal strength of an anchor in tension: (17.4.1.2)*
, where,
0.9743 , 4 f uta =
min(futa , 1.9f ya, 860 Mpa)
f uta =
400 400 Mpa
A se,N =
4197 4197.6 .62 2 mm mm2 2
Nsa = φT = φTNsa =
1679 1679.0 .05 5 kN 0.75 1259 1259 kN
2.2 Concre Concrete te brea breakou koutt stren strength gth The nominal concrete breakout strength in tension:
where,
, , ,
1.5 1.5 2 1 . 5
(17.4.2.1a)*
and 9
A nc =
8,787,938 mm2
(without plate)
A nc =
9,430,688 mm2
(with plate)
A nco =
14,630,625 mm2
kc =
10
λa =
1
(for cast in anchors)* (normal concrete)*
λ ′ .
where,
/
3.9λ ′ Nb = φed,N =
2409 2409.0 .04 4 kN 0.76039
(17.4.2.2a)* (17.4.2.2b)*
, 1.0
if ca,min > 1.5hef
(17.4.2.5a)*
, , 0.7 0.3 1.5
if ca,min < 1.5hef
(17.4.2.5b)*
where,
φc,N =
1.25
(for cast in anchors)*
φcp,N =
1
(for cast in anchors)*
Ncb =
1375.36 kN
φT =
1475.95 kN 0.75
φNcb =
1032 kN
(without plate)
1107 kN
(with plate)
(without plate) (with plate)
2.3 Pullout strength The nominal pullout strength in tension: (17.4.3.1)*
, φc,P =
1.4
(uncracked concrete)*
0.866 0.25 0.25
(without plate) (with plate)
A brg =
7390.76 mm2
(without plate)
Np =
17939.63 mm2 1655.53 kN 4018.48 kN
(with plate) (without plate) (with plate)
Npn =
2317.74 kN
(without plate)
5625.87 kN
(with plate)
φT =
0.75
φNpn =
1738 kN
(without plate)
4219 kN
(with plate)
2.4 Side-face blowout strength The nominal side-face blowout strength:
13 Nsb =
φT = φNsb =
λ ′
(17.4.4.1)*
2276.81 kN
(without plate)
3547.23 kN
(with plate)
0.75 1708 kN
(without plate)
2660 kN
(with plate)
2.5 Summary for Anchor Strength due to Tension Load Without Plate
With Plate
Tensile (φTNsa)
1259
1259
Concrete Breakout ( φNcb)
1032
1107
Pullout (φNpn)
1738
4219
Side-face blowout (φNsb)
1708
2660
1259
1259
