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ANCHORED PILE JETTY DESIGN
Input required data Length of the ship Dead Load of the ship ( unloaded ) Cargo Load of the ship Total load of the ship = Depth from low tide to ship bottom = Height required above high tide = Difference between low and high tide =
150 ft
= 8000 tons = 12000 tons =
5.3 m 2.5 m 1m
Tota Totall depth depth of sheet sheet pile pile abov above e dred dredge ge line line ( H )= Input the desired depth ( H ) for the sheet pile = NOTE :
45.73 m 8000000 kg kg 12000000 k g 20000000 kg kg
8.8 8.8 m
9m
The depth of embedment embedment for sheet pile is * 0.90H to H for cantilevered sheet pile * 0.40H to 0.50 H for embedded sheet pile with anchor
Input the approx.initial depth of embedment ( D )=
5m
Minimum shock load equivalent to a thrust = 1% of the 200000 kg maximum weight of vessel to be berthed =
=
Then , calculate shock load (Fs) to produce permissible deflection (5") on the fender system and a glancing blow equal to 1/10 of the kinetic energy produced by the berthing ship's approach velocity ( 1 mph ) Input the allowable ( standard ) deflection (d) = = Input the ship's allowable approach velocity
= =
5 in
0.13 m 1 mph
0.45 m/s
Calculating shock load by work - energy method Fs x d = 1/10 ( 1/2 * ( weight * approach velocity ) ) Fs = min Fs =
1573.296 KN 1960.000 KN
Input higher value of shock load Fs for design = Bending moment ( sheet pile ) due to Fs
=
Soil Density = Angle of Friction =
1960 KN
17640 KN-m
18 KN/m 30 deg
1960 KN
Active Pressure coefficient (ka) = Passive Pressure coefficient (kp) = a =kaH / ( kp-ka) = P1 = wkpH (H+a)/2 = acting at y = ( 2a + H ) / 3 from O = P2 = (wD(kp-ka) - wkaH)x(D-a)/2 =