15 analysis of container berth

8/3/2019 15 Analysis of Container Berth

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LECTURE - 15

ANALYSIS OF

CONTAINER BERTH


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CONTAINER BERTH

A berth for loading an unloading of containerized

cargo to and from the ship

A berth generally with a large stacking yard for

handling containerized cargo, which may also be used

as a general cargo berth.

Department of Ocean Engineering, IIT Madras


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ANALYSIS OF CONTAINER BERTH(Example)

Considered as a total length of berth 820 m divided

into 13 blockseach of 75 m.

Width of the container berth is 40 m span of

container crane is 30 m.

Two container cranes are considered for the analysis.



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Each container has 4 legs and each legs has 8 wheels

c/c distance between two legs is 15 m

c/c distance

between two wheel is 1.5 m.

Vessel size upto104000 DWT

Levels:

Top Level : +4.8 m

Dredge Level : -16.0 m

Founding Level : -36 m



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Pile Diameter 1200 & 1100 mm; spacing laterally

7.62 m and longitudinally7.5 m c/c

Thickness of slab and wearing coat - 0.4 m and 0.05 m.

Crane beams1m x 2.5 m

Main beams

1m x 2 m



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TIDAL DATA

Highest water level - +1.65m

Mean High water Springs - +1.158m

Mean High Water Neaps - +0.823m

Mean Low Water Springs - +0.122m

Mean Low Water Neaps - +0.396m

Indian Springs High Water Level - +1.524m

Indian Springs Low Water Level - +0.00m

Mea n High Water - Assumed to correspond to MHWSMean Low Water - Assumed to correspond to MLWS

Lowest Low Water - Assumed to correspond to ISLW



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WIND

The crane wheel loads and bollards loads given in the

design are inclusive of wind effect.

WAVES

Waves are of 1m height and 10 second period.

CURRENTS

The maximum design current shall be 0.5m/s along the

quay structure. Allowance for 100mm marine growth on all

surfaces shall be made.



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The Employer has provided soil data on the basis of specificdetailed soil investigation works carried in the proposed area of

the berth construction including laboratory testing. FIXITY LEVEL OF PILES:

The fixity level of pile considered in analysis has been

calculated as per IS 2911.

DESIGN LIFEDesign life to be 50 years.

SITE PARAMETERS



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VESSEL DATA

Size of vessel : 104,000DWT

Displacement tonnage : 145,600

Length overall : 342m

Beam : 42.8m

Depth : 27.7m

Draft of vessel : 14.5m

Berthing Speed : 0.1m/s

Berthing angle : 10 degrees

BOLLARD CAPACITYBollard of 150 tonnes capacity shall be provided at 30

meters to suit maximum Size Container Vessel.



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FENDERS

Fender of suitable design shall be provided for container

vessel of 104 000 DWT. UNIT WEIGHT

Reinforced concrete : 25 kN/m3

Plain concrete : 24 kN/m3

TEMPERATURE EFFECTCoefficient of thermal expansion for concrete is taken to

be 9 x 10-6 per C according to Clause 6.2.6 of IS 456:2000.

ELASTIC PROPERTIES

For elastic analysis of structures, the instantaneous or

short term elastic modulus of concrete (Ec) shall be

determined in accordance with Clause 6.2.3.1. of IS 456:2000.



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LOADS

DEAD LOADS

Density of reinforced concrete = 25 kN/m3

Density of plain concrete = 24 kN/m3

Density of steel = 78.5 kN/m3

Super Imposed Dead Loads

Superimposed dead load on main quay deck = 2.5kN/m2to allow for surfacing. Loads of Fenders & Bollards etc. areevaluated separately.

LIVE LOADS

Live load taken is 5 T/m2 within the crane rail afterallowing clearance of 1.5 m from crane and 1 T/m2 oncantilever slab between cope line and seaside crane rail afterallowing space for bollards, coping and slots for cabling forcontainer crane.



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VEHICLE LOADS ON DECK

IRC-Class AA-70 R Loading

Trailer Truck Loading

In accordance with the impact factor to be applied on IRC

loading and trailer truck loading will be one-third of the

impact factor specified in IRC 6.

WAVE LOADS:

Wave forces are calculated in accordance with IS 4651

Part 3. The charts given in the US Ar5my Shore protection

Manual are used.

Drag coefficient CD = 0.7

Inertia coefficient Cm = 2.0

100 mm marine growth is considered on piles.



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CURRENT LOADS:

Maximum design current shall be 0.5 m along the quay

structure. Allowance for 100 mm marine growth is kept.

Forces due to current are calculated using Morisons

equation, with CD = 0.7

BERTHING LOADS

Berthing energy shall be calculated in accordance with IS

4651 Part 3. Accident loading (with an additional 50%

berthing energy) is considered. A safety factor of 1.4 shall be

considered

MOORING LOADS

A mooring pattern, representing the head and stem lines

from two moored vessels, shall be used in the calculations.



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TEMPERATURE AND SHRINKAGE EFFECTS

Temperature load effects should be calculated assuming acoefficient of expansion of 9 x 10-6 per 0C for the concrete.

Temperature loads shall be assessed in accordance with IS

456:2000.

SEISMIC LOADS

For earth retaining structures the assessment of seismic

effect shall be carried out in accordance with IS 1893 (2002)

as specified.



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METHODOLOGY

The analysis has been carried out using conventional

STAAD Pro software. The structure is considered as a

space frame and different loads are applied as per IS 875.

the critical load case has been considered for design has

been done using Limit State Method of Collapse and

Method of Serviceability condition.



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CLEAR COVER TO BE PROVIDED

Following clear cover to be provided for main

reinforcement for various structural members.

Pile : 75 mm

Pile muff : 75mm

Beam : 50 mmSlab : 50 mm

ANALYSIS

A 3D dimensional analysis has been carried out using

STAAD Pro package.



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LOAD COMBINATIONS

The design has been carried out using limit state method.

LIMIT STATE OF SERVICEABILITY

1.0DL + 1.0 LL +1.0 CL4

0.9DL + 0.9LL + 1.0SF-T

LIMIT STATE OF COLLAPSABILITY

1.5DL + 1.5LL + 1.5BF

1.5DL + 1.5LL + 1.5MF-1

1.5DL + 1.5LL + 1.5MF-2

1.2DL + 1.2LL

1.2DL + 1.2LL +1.5SF-T

1.2DL + 1.2LL + 1.5SF-L

0.9DL + 0.9LL +1.5SF-T



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0.9DL + 0.9LL + 1.5SF-L

1.5DL + 1.5LL + 1.5CL-1(ACROSS)

1.5DL + 1.5LL + 1.5CL-1 (ALONG)

1.5DL + 1.5LL + 1.5CL-2 (ACROSS)

1.5DL + 1.5LL + 1.5CL-2 (ALONG)

1.5DL + 1.5LL + 1.5CL3

1.5DL + 1.5LL + 1.5CL4

Where,

DL = Dead load

LL = Live load

BF = Berthing force

MF = Mooring force

SF = Seismic Force

CL = Crane load



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STAAD DISCRETIZATION DIAGRAM

L

Dead Loads


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Lo

Live Loads


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Crane Load Position - I


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Crane Load Position - II


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Berthing Force


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Mooring Force


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Wave Load


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Loa

Current Load

15 analysis of container berth

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