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Anchor Bolt Calculation

The document provides specifications for anchor bolts used to secure a vessel, including: - The operating weight of the vessel is 16578 kg - Seismic loads result in a shear force of 6092 N and moment of 7433 N-m on the bolts - The maximum tension force per bolt is 6937 N under seismic loads in the transverse direction - Total shear and tension forces were calculated to be within allowable stress limits for M30 bolts.

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1K views3 pages

Anchor Bolt Calculation

The document provides specifications for anchor bolts used to secure a vessel, including: - The operating weight of the vessel is 16578 kg - Seismic loads result in a shear force of 6092 N and moment of 7433 N-m on the bolts - The maximum tension force per bolt is 6937 N under seismic loads in the transverse direction - Total shear and tension forces were calculated to be within allowable stress limits for M30 bolts.

Uploaded by

cordajohn
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLS, PDF, TXT or read online on Scribd
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Operating Weight Wo = 16578 kg

Inside diameter of vessel d = 700 mm


T/L to T/L length l = 4.942 m
Overall length L = 5.329 m
Overall height H = 2.513 m
Distance of vessel C/L from base h = 1.22 m
Design horizontal seismic coefficient Ah = 0.3675
Seismic shear Fs = Ah * Wo = 6092 N
Seismic moment Ms = Fs * h = 7433 N-m

Force in transverse direction Fx = 6092 N


Mx = 7433 N-m
Shear Force per bolt Fxx = Fx / Ntb = 1523.1 N

Distance of bolt from the edge of the r1 = 75 mm


saddle r2 = 525 mm
åri2 = 281250
Lever arm factor for max. tension force
åri2/ri = 535.7 mm
due to moment
Maximum Tension Force for 2 bolts F1 = Mx / (åri2/ri) = 13874.5 N
Tension Force per bolt Ftx = F1 / Nb = 6937.2 N

Force in longitudinal direction Fz = 6092 N


Mz = 7433 N-m
Shear Force per bolt Fzz = Fz / Nb = 3046.2 N
Distance between the saddle r1 = 2400 mm
Maximum Tension Force for 2 bolts F2 = Mz / r1 = 3097.0 N
Tension Force per bolt Ftz = F2 / Nb = 1548.5 N

Force in Vertical direction Fy = 0 N


Tensile Force per bolt Fty = Fy / Ntb = 0.0 N

Total Shear & Tension Force in Anchor bolts due to X, Y & Z directions
Shear Force in X-direction Fxx = 1523.1 N
Shear Force in Z-direction Fzz = 3046.2 N
Tension Force in Y-direction Ft = Ftx + Fty + Ftz = 8485.7 N

Resultant Shear Force Fv = √ F xx2 +F zz2 = 3406 N

Total No. of Anchor Bolt Ntb = 4


No. of Anchor Bolt per saddle Nb = 2
Anchor Bolt Size = M30
Area of Anchor Bolt Ab = 502.965 mm2
Material of Anchor Bolt IS 1367 Gr 4.6

Allowable Shear Stress Fvb = 80.0 N/mm2


Allowable Tensile Stress Ftb = 120.0 N/mm2
Shear Stress in Anchor Bolt fv = Fv / Ab = 6.77 N/mm2
Tensile Stress in Anchor Bolt ft = Ft / Ab = 16.9 N/mm2
Combined Tension & Shear Stress fv2 / Fvb2 + ft2 / Ftb2 = 0.0269 < 1
Anchor Bolt Calculation

Operating Condition

Operating Weight = 43760 kg


Vessel C.G @ operating condition from B.T.L = 2484.5 mm
Lug Support from B.T.L = 4500 mm

Seismic Coefficient = 0.06


Seismic Shear on Bolts = 25750 N
Seismic Bending Moment on Lugs = 51900 Nm

Wind Shear = 19700 N


Wind Moment = 41000 Nm

Seismic Loads Governs

Bolt Circle Diameter = 3100 mm


No. of Bolts = 8

Allowable Tensile Stress in Bolts = 120 N/mm2


Allowable Shear Stress in Bolts = 80 N/mm2

4*M/D-W = -362142.82 N

No. Uplift Exit

Shear Area Required per Bolt = 40.23 mm2

Tensile Area Required per Bolt = - mm2

Empty Condition

Erected Weight = 4900 kg


Vessel C.G @ enpty condition from B.T.L = 3223 mm
Lug Support from B.T.L = 4500 mm

Seismic Coefficient = 0.06


Seismic Shear on Bolts = 2900 N
Seismic Bending Moment on Lugs = 3710 Nm

Wind Shear = 19700 N


Wind Moment = 41000 Nm

Wind Loads Governs

Bolt Circle Diameter = 3100 mm


No. of Bolts = 8

Allowable Tensile Stress in Bolts = 120 N/mm2


Allowable Shear Stress in Bolts = 80 N/mm2

4*M/D-W = 4853.83 N

Uplift Exist

Shear Area Required per Bolt = 30.78 mm2

Tensile Area Required per Bolt = 5.06 mm2

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