Manglore Refinery and Petrochemicals Limited Phase III Refinery Project Diesel Hydrotreating unit Package ( EPCC - 4 ) 6782-LT-333-CV-CL-0311
Doc. No.:
L&T - CHIYODA LIMITED Rev. No.: 0
Title :
Design Calculation For Technological Structure TS-1 Base Plate Design: (Case: Axial Compression with Bending, Where e < D / 6)
Page :
Base plate is designed for maximum support reaction among all load cases. Column: 0 3075 Load case: Axial force (Pc)
1630 kN
Shear (Fx)
210 kN
Moment (M)
60 kN-m
Shear (Fz)
30 kN
e Base plate size Length (D) 775 mm
Pedestal size Length (Lx) 1000 mm
Width (C)
600 mm
Width (Lz)
800 mm
Total No of Bolts Nt No 6
Allow Tension Capacity kN 137.5
Allow Shear Capacity kN 91.3
Anchor bolt : Anchor bolt Dia mm 36
D
Pc
sc
Allowable Capacity is increased by factor of 1.25 for Short term loading
here, e = M / Pc
Grade of Concrete
=
36.8
<
D/6
<
775 / 6
<
129.2
=
mm
mm
Hence, there is no tension in the anchor bolt
M 30
Check for shear : Total shear force
Shear force IN each bolt (Se)
2
2
=
Fx + Fz
=
212.13 kN
=
35.36 kN
<
91.25 kN (Allowable shear capacity of the bolt)
=
Pc / A + M / Z
=
1630 x 1000 / ( 600 x 775 ) + ( 60 x 10^6 x 6 ) / ( 600 x 775^2 )
=
4.50
OK
Check for bearing in concrete : Bearing pressure in conc (sc)
Allowable Bearing Pressure
=
2
N / mm
sqrt(A1/A2) x 0.25 x fck
Manglore Refinery and Petrochemicals Limited Phase III Refinery Project
L&T - CHIYODA LIMITED
Doc. No.: Title :
Manglore Refinery and Petrochemicals Limited Phase III Refinery Project Diesel Hydrotreating unit Package ( EPCC - 4 ) 6782-LT-333-CV-CL-0311
L&T - CHIYODA LIMITED Rev. No.: 0
Design Calculation For Technological Structure TS-1 A1 = Loaded area A2 = Supporting area sqrt(A1/A2) = 1.312 4.50
= =
800000 465000
2
= >
Page :
9.837 N / mm 2
OK
N / mm
Manglore Refinery and Petrochemicals Limited
L&T - CHIYODA LIMITED
Manglore Refinery and Petrochemicals Limited Phase III Refinery Project Diesel Hydrotreating Unit Package ( EPCC - 4 )
L&T - CHIYODA LIMITED
Doc. No. : 6782-LT-333-CV-CL-0311 Title : Design Calculation For Technological Structure TS-1
Rev No: Page :
1
Design for Thickness of Base Plate : BP2 NODE : 10 & 11 1) Corner of Base Plate (Refer Figure - A) Considering the shaded part of base plate, to be simply supported at two sides and free at two ends.
a b
= =
a/b
= =
Bending stress coefficient ( b )
180 mm 180 mm
Free
=
s s
e
180 / 180 1.00
a e r
F
ss
1.769
(for Bending stress coefficient (b), refer “Roark’s Formula for Stress & Strain” by Warren C. Young)
Figure - A Maxm. Pressure below base plate (sc)
=
4.5043
Maxm. Bending stress in plate
=
( b x sc x b ) / t
Permissible bending stress
sbc max
Equating eq 1 with sbc max
t
Required thickness of base plate
N / mm 2
=
2
2
…eq.1
231.25 N / mm2
2
=
(b x sc x b ) / sbc max
2
t
2
=
( 1.769 x 4.5 x 180^2 ) / 231.25
t
=
33.4
mm
2) Middle of Base Plate (Refer Figure - B) Considering the shaded part of base plate, to be simply supported at three sides and free at one end.
a a b
= =
a/b
= =
Bending stress coefficient ( b )
Free
240 mm 180 mm
s s
b
240 / 180 1.33
=
0.744
(for Bending stress coefficient (b), refer “Roark’s Formula for Stress & Strain” by Warren C. Young)
Figure - B
Average pressure below base plate (sc)
=
4.50
Maxm. Bending stress in plate
=
( b x sc x b ) / t
=
231.25
Permissible bending stress
sbc max
s s
N / mm 2
2
2
N / mm2
…eq.1
Manglore Refinery and Petrochemicals Limited Phase III Refinery Project Diesel Hydrotreating Unit Package ( EPCC - 4 )
L&T - CHIYODA LIMITED
Doc. No. : 6782-LT-333-CV-CL-0311 Title : Design Calculation For Technological Structure TS-1 Equating eq 1 with sbc max
1
2
=
(b x sc x b ) / sbc max
t
2
=
( 0.744 x 4.5 x 180^2 ) / 231.25
t
=
21.7
t
Required thickness of base plate
Rev No: Page : 2
mm
3) Middle Edge of Base Plate (Refer Figure - C) Considering the shaded part of base plate, to be simply supported at three sides and free at one end.
a b
= =
a/b
= =
300 mm 207.65 mm
a ss
300 / 207.65 1.44
b b
Bending stress coefficient ( b )
=
e e r F
s s
ss
0.764053
Figure - B
(for Bending stress coefficient (b), refer “Roark’s Formula for Stress & Strain” by Warren C. Young)
