Copy Of Jetty Design 725x25

Design consideration for Ocean Structures A) Environmental Loadings 1) Force due to wind 2) Wave Force 3) Current Force B) Function and Operation Due to tides and water level variations C) Selection of materials and the durability and Longevity of structures 1) Corrosion 2) Fouling(due to accumulation of various plant growths and animal organisms on partially/fully immersed surfaces) 3) Attack by marrine organism 4) Scouring and deposition

Area of Exposed surface to environmental forces W ave/Current forces Arrival deck Columns Radius of column Height of high tide level from sea bed

0.15 2

No. of columns

Kmph KN/m2

38.88889

Radius of column

5 4 20 10

m m m2

1.88552

KN

30 1 30 50

m m m2

0.565656

KN

No. of columns

Total Vertical projection length Total Vertical projection height Exposed area No. of exposed nodes

1.5 0.6 11.5 0.130435 0.83 1.2 1.8 3.518334 0.834404 17.56272

m m m

0.5625 11.4375 pg. 46 Seetharaman(Dock and Harbour engineering) pg. 46 Seetharaman(Dock and Harbour engineering) 1.8 for ocean storm waves, pg. 57 S. seetharaman

m/s m/s KN/m2

3) Tidal Current Force on each column Arrival deck column 0.6 0.942478 1 2 3.986502 0.388088 0.213437 0.601525

m2 m2 m m Kmph KN KN KN

0.3 0.471239 1 2 3.986502 0.194044 0.106719 0.300762

m2 m2 m m Kmph KN KN KN

Walkway column

As per Molitor method 4) Dead Load Material unit wts Unit wt of concrete 24 Unit wt. of Timber 8.4 Unit wt. of sea water 10.3 RCC Column at arrival deck Height 2.5 Radius 0.15 Wt. of column 4.24115 RCC Column at walkway Height 1.5 Radius 0.15 Wt. of column 0.015904 RCC Beams width 0.2 depth 0.3 wt 1.44 W t of deck Width of deck No. of Timber joists in 1 mtrs Width of joist Depth of joist depth of deck Load of Joists Load of timber deck platform Total

5) Live Load 4 KN/m3 KN/m3 KN/m3 m m KN m m KN m m KN/m 1 2 0.2 0.2 0.02 0.672 0.168 0.84

m m m m KN/m2 KN/m2 KN/m2

0.15

m

1

m

5

Area of vertical projection of each column Area of wetted surface of each column

Walway column

Area of vertical projection(Ad) Area of wetted surface(Af) Tidal height Mean sea depth Velocity of current Dynamic force Frictional Force Total force of current

m2 m2

m/s

Mean Height of high tide level from sea bed

Load on each node

Area of vertical projection(Ad) Area of wetted surface(Af) Tidal height Mean sea depth Velocity of current Dynamic force Frictional Force Total force of current

0.6 0.942478

Walk way columns 140 0.94276

Arrival deck Total Vertical projection length Total Vertical projection height Exposed area No. of exposed nodes

Load on each node 2) W ave Force Still water depth(d) Wave height(H) Wave Length(L) d/L Shallow water coefficient(c') Orbital velocity in shallow water(m) K Velocity of wave propagation(v) Max. orbital velocity Max. wave pressure(p1)

m m

5

Area of vertical projection of each column Area of wetted surface of each column

LOADS ON JETTY 1) W ind Velocity of wind Wind Pressure intensity

KN/m2

0.3 0.471239

m2 m2

1