8474L-015-CN-1732-041-0
VIETNAM OIL AND GAS CORPORATION ( PETROVIETNAM ) OP Center Job No. 0- 3952-20
DUNG QUAT REFINERY (DQR) PROJECT OP Center Doc. No. C-015-1323-041
4.5 PEDESTAL DESIGN
4.5.1 Clearance of Pedestal Re-bar
Clearance of rebar from pedestal bottom 0.050 m
Clearance of rebar from pedestal top 0.075 m
Clearance of rebar from pedestal side 0.060 m
4.5.2 Pedestal # 01
(1) Design of Rebar
Px = 800
Py = 800
H= 1500
fc' 25
fy 420
fy for anchor bolts 250
Area of Pedestal = Ag= 640000 mm²
X-DIRECTION Y-DIRECTION
Rebar Size 16 mm 16 mm
Sectional Area 201 mm² 201 mm²
Nu 485.2 KN 485.2 KN
Mu L/C: C2-3 1007.8 KN-m L/C: C2-6 32.47 KN-m
r = h/H 0.83 0.83
Nu / Ag 0.76 0.76
Mu / Ag . H 1.97 0.06
p 0.01 Using Interaction Chart 0.001 Using Interaction Chart
Act 6400.0 mm² 640.0 mm²
Minimum p required 0.010
Required As 6400 mm²
Number of Anchor bolts 2
Anchor bolts size 30 mm
Total area of anchor bolts (Ab) 1414 mm²
Required As = fy(bolt)/fy * Ab 841 mm²
Governing As 6400 mm²
Rebar nos provided 32
As provided 6434 mm² OK !
(2) Check for Shear Strength
X-DIRECTION Y-DIRECTION
Vu 10.0 KN 10.0 KN
Ag 0.64 m² 0.64 m²
d 719 mm 719 mm
φVc = 0.75 x ( 1 + Nu/14Ag ) √ fc' Px dz/6 379 kN 379 kN
φVc = 0.75 x √ fc'^0.5 * Px dz / 6 360 kN 360 kN OK !
8474L-015-CN-1732-041-0
VIETNAM OIL AND GAS CORPORATION ( PETROVIETNAM ) OP Center Job No. 0- 3952-20
DUNG QUAT REFINERY (DQR) PROJECT OP Center Doc. No. C-015-1323-041
SHEAR REINFORCEMENT:
Rebar Size 10 mm 10 mm
Rebar pitch 200 mm 200 mm
Sectional Area 79 mm² 79 mm²
Rebar nos 8 8
φVs = 0.75 x Av fyt d / s 355.76 KN 355.76 KN
φVn = φVc + φVs 715.26 KN 715.26 KN O.K
(3) Rebar Arrangement for Pedestal
Main Bar 32 bars D 16
Link- 16 bars D 10 @ 200 mm
Material Properties
Steel
Reinforcement bar yield strength fy 420 Mpa M
Strain at yield strength εy 0.0021 P
Modulus of elasticity Es 200000 Mpa M/Ag h
Concrete P / Ag
Concrete compressive strength at 28 days (Cylinder) 25 Mpa
Strain εu 0.003 M1
Modulus of elasticity Ec 23500 MPa M2
Rect/spiral (0/1) 0 ß1 0.85 Curvature
M1/M2
Column Data
b 800 mm h 800 mm
Ag 640000 mm²
cover 60 mm d 740 mm
gamma 0.85 d' 60 mm
p 0.01 0.02 0.03 0.04 0.05
εs φM/Ag h φP/Ag φM/Ag h φP/Ag φM/Ag h φP/Ag φM/Ag h φP/Ag φM/Ag h
MPa MPa MPa MPa MPa MPa MPa MPa MPa
-0.0030 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0!
-0.0025 0.00 16.54 0.00 19.27 0.00 22.00 0.00 24.73 0.00
-0.0020 0.03 16.48 0.06 19.14 0.08 21.81 0.11 24.47 0.14
-0.0015 0.17 16.15 0.33 18.49 0.50 20.83 0.66 23.17 0.83
-0.0010 0.30 15.83 0.61 17.84 0.91 19.86 1.22 21.87 1.52
-0.0005 0.81 14.72 1.25 16.41 1.69 18.10 2.14 19.79 2.58
0.0000 1.74 12.23 2.32 13.59 2.90 14.96 3.48 16.32 4.06
0.0011 2.55 8.73 3.42 9.41 4.29 10.09 5.16 10.77 6.03
0.0016 2.74 7.46 3.76 7.80 4.77 8.15 5.79 8.49 6.80
0.0021 2.90 6.43 4.06 6.43 5.23 6.43 6.40 6.43 7.57
0.0026 3.05 6.22 4.30 6.22 5.54 6.22 6.79 6.22 8.03
0.0032 3.19 6.04 4.51 6.04 5.83 6.04 7.16 6.04 8.48
0.0042 3.42 5.77 4.90 5.77 6.38 5.77 7.86 5.77 9.33
0.0074 3.29 4.36 4.90 4.36 6.50 4.36 8.11 4.36 9.72
0.0105 2.91 3.17 4.44 2.99 5.98 2.82 7.51 2.64 9.04
0.0137 2.60 2.30 4.03 1.90 5.47 1.49 6.90 1.09 8.33
0.0168 2.34 1.64 3.68 1.01 5.01 0.37 6.35 0.00 7.69
0.0210 2.05 0.94 3.26 0.00 4.47 0.00 5.67 0.00 6.88
0.0315 1.49 0.00 2.37 0.00 3.25 0.00 4.13 0.00 5.01
0.0420 1.03 0.00 1.59 0.00 2.14 0.00 2.70 0.00 3.25
0.0630 0.33 0.00 0.33 0.00 0.33 0.00 0.33 0.00 0.33
0.0840 0.25 0.00 0.25 0.00 0.25 0.00 0.25 0.00 0.25
1007.3 kN-m k 2
485.17 kN Lu 1500 mm
1.97 MPa r = 0.3 b 240 mm
0.76 MPa k Lu / r 12.5
34 - 12 M1/M2 22.0
0 kN-m
1007.34 kN-m Ig 3.41E+10 mm^4
Single 1 EI = 0.25 Ec Ig 2.01E+14 N-mm²
1.00
Column Buckling Load
Pc = π² EI / (kLu)² 219909 kN
Cm = 0.6 + 0.4M1/M2 1.00
Moment Amplification Factor 1.00
M2 min 18.9 kN-m
Mc 1010.3 kN-m
0.05
φP/Ag 30
MPa
#DIV/0!
27.46
27.14
25
25.51
23.89
21.48
17.69
11.46 20
8.83
6.43
6.22
6.04
15
5.77
4.36
2.47
0.68
0.00 10
0.00
0.00
0.00
0.00
5
0
10
5
0.00
0
0.0 2.0 4.0 6.0 8.0
Single
Double
8.0 10.0 12.0
