Post on 01-Feb-2016
description
LRFD
Column Load:
28 kip
Plate Properties:
N 25.98 in
B 14.37 in
36 ksi
Concrete Pier Properties:
3.0 ksi
B' 0 in
D' 0 in
Column Properties:
d 15.00 in
3.40 in
Bearing:
0.60
373.40
0
948.0 kip
1896.0 kip
948.0 kip
568.8 kip
Plate Thickness Design:
0.90
m 0.06 in
n 11.63 in
X 0.03l 0.17
n' 1.79 in
0.31
l 11.63 in
0.790 in
Pu
fy
f'c
Enter "0" for full support
bf
fc
A1 in2
A2 in2
Pp1
Pp2
Pp
fcPp
fc
ln'
tmin
Maximun Moment Reaction1) From previous calculations, Tu = 38.49 kips.
If three anchor bolts are used in each face on the column, the force per rods equal 12.83 kipsFrom Table 3.1, the design strength of 1-in.-diameter ASTM F1554 Grade 36 (ASTM A36) anchor rods is 25.6 kips
The pullout strength of each anchor rod with a heavy hex nut is selected from Table 3.2 as 25.2 kips, which is greater than the required strength per rod of 12.83 kips.
For completeness, determine the embedment length for the anchor rods.Try 13.78 in. of embedment.
The design concrete breakout strength is:
Considering the ratio between areas = 0.7
= 42419 lb
= 42.42 kips >= 38.49 kips
For moderate or high seismic risk, ACI 318-08 indicates that the strength of anchors is to be multiplied by 0.75. In thiscase, the steel strength would be 0.75(25.60) kips = 19.20 kips per rod (we need at least 12.83 kips). The anchor rods are o.k.
Use 6 Rods 1" x 350mm ASTM A36 or similar
2) Maximun shear force is:
Vu = 2718 kg
Vu = 5.99 kips
Stresses in rods:fv = 1.27 ksi <= 17.4 ksi
By inspection 3/4-in. plate washers will suffice even with minimal edge distance. Thus, the lever arm can be takenas one half of the sum of the base plate thickness and 0.750 in, the base plate thickness is 0.75in
Lever arm = 0.75 in
Thus:
Mt = 2.25 kip.inZ = 0.17 in^2
ftb = 13.48 ksi
fta = 8.17 ksi
The tensile stress is:
ft = 21.65 ksi
Combined shear and tension strength:
Fnt = 43.50 ksiFnv = 23.20 ksi
= 40.03 ksi <= 32.63 ksi
= 32.63 ksi >= 21.65 ksi
If three anchor bolts are used in each face on the column, the force per rods equal 12.83 kipsFrom Table 3.1, the design strength of 1-in.-diameter ASTM F1554 Grade 36 (ASTM A36) anchor rods is 25.6 kips
The pullout strength of each anchor rod with a heavy hex nut is selected from Table 3.2 as 25.2 kips,
OK
For moderate or high seismic risk, ACI 318-08 indicates that the strength of anchors is to be multiplied by 0.75. In thiscase, the steel strength would be 0.75(25.60) kips = 19.20 kips per rod (we need at least 12.83 kips).
OK
By inspection 3/4-in. plate washers will suffice even with minimal edge distance. Thus, the lever arm can be takenas one half of the sum of the base plate thickness and 0.750 in, the base plate thickness is 0.75in
OK