design of fenders for berthing to bs 6349
Post on 21-Nov-2015
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OPERATING INSTRUCTIONSSIMPLY SUPPORTED SPANR
CONTINUOUS SPANPROVIDE
SUPPORTPermissible L/d =
CANTILEVERActual L/d =
WHERE YOU WANT.None
Nominal
Choose SECTION LOCATION hereAcceptance factor =97.5%
d = 244
K' = 0.1558
COMPRESSION STEELK = 0.0173 > K =
z = 231.8 > 0.95d =
As = 397.74 < min As =
(deflection control only)min As = 720
Required = 720
S = 150
As prov = 753.98
fs = 144.19
Base ratio = 26
Tens mod factor = 2.000
Comp mod factor = 1.000
Maximum spacing is okL/d (p) = 52
L/d (a) = 12.295OK
As increased by 1.000.00%
0
Subclause(a)0
Max S7440
Min Sb370
DESIGN OF FENDERSBERTHING MODESide BerthingBerthing Angle = 30Hull contact Angle with the Fender or Angle of Approach = 600Velocity of Vessel = 20m/sBERTHING ENERGYNORMAL ENERGYEN = 0.5 X M X VB2 X CM X CE X CC X CS= 0.5X82.65X 0.179X1.8X1.0X1.0X1.0= 13.315KNmWhere,EN = Normal berthing Energy M = Mass of Vessel = 82.65VB = Approach Velocity perpendicular to the berthing line = 0.179m/sCm = Added mass coefficient = 1.8CE = Eccentricity coefficient = 1.0Cc = Berthing configuration coefficient = 1.0Cs = Softness coefficient = 1.0
ABNORMAL ENERGYEA = FS X EN = 2.0X130.491 = 26.631KNmWhere,Fs = Factor of safety for abnormal berthing = 2.0EA = Abnormal EnergyEN = Normal Energy
FENDER SELECTIONEfficiency = Energy Absorbed /energy reaction generated = E/R = 26.631/84.3 = 0.316KN/m2/KN OKFENDER PANEL DESIGNFor smaller vessels, the HULL PRESSURE is considered same as BELTINGFOR Aluminum Hull in light vesselsBELTING LOAD = 150KN/mUHMW-PE FACING (FQ 1000) considered okSteel thickness [internal not exposed=8mm]STANDARDEN 10025 GRADES235JR [1.0038]YIELD STRENGHT235N/mm2 with psi 34000TENSILE STRENGTH 360N/mm2 with psi 52000
FASTENINGThread Nuts = 25mmWashers = 5mm thickBolts = M 16
Bollard Pull Calculation
Project:MARINA JETTY
Prop diam1.8m.Disk Area2.545sq.m
Pull Req'd26630kgSHP Reqd4119
Pull Req'dSHP Req'd
100030
Provide 30 tones Bollards
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