Port Works Design Manual : Part 2

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26of passengers embarking and disembarking. Passengers may find it difficult to walk on thegangplank or may even lose their balance when small vessels moor at a pier in rough seaconditions. Marine Department should be consulted at an early stage as to whether anyprovision to permit a better gangplank or transfer system for the passengers can beincorporated in the design. Lifesaving equipment should be provided at suitable locationson the piers.2.10 AestheticsA pier may become a prominent feature on the seafront and its appearance may have a visualimpact on the surrounding landscape. Therefore, apart from meeting the functional andsafety requirements, the design of a pier should take into consideration the aesthetic aspectsto ensure that its appearance is in harmony with the environment. Some general guidelineshave been given in Chapter 8 of Part 1 of the Manual. Specific aspects are furtherelaborated in Chapter 6 of this part of the Manual.
273. PILED DECK PIERS3.1 GeneralThere are two major structural forms for piled deck piers, namely, flexible structures andrigid structures, as shown in Figure 7.For flexible structures supported by vertical piles only, relatively large lateral deflection willoccur when they are subjected to horizontal forces. Flexible structures are less capable ofresisting berthing forces and therefore they may not be suitable for accommodating largevessels. Rigid structures usually consist of pairs of piles raking in opposite direction toform a truss to resist the horizontal forces. They are strong in resisting berthing forces andtherefore they can accommodate larger vessels than flexible structures.The following steps are normally involved in the design of a piled deck pier :• Determine the design conditions, such as the design life, return period of loads,type and dimensions of vessels, and operations and installations on the pier.• Determine the layout of the pier, such as the shape and dimensions of the deck,deck level, orientation, arrangement of fenders and moorings, locations offacilities and installations, dimensions of pier superstructure.• Determine the depth alongside the pier and if an access channel is required.• Design the fenders for the pier.• Calculate the self-weight of the pier and the external forces, such as surcharge,live loads from pier operations, berthing and mooring loads, environmentalloads including wind, wave and current loads, buoyancy and wave uplift.• Examine the stability of slopes, if any, under the pier deck.• Determine the layout of the piles and structural arrangement of the deck.• Carry out structural analysis to determine the stresses in piles and structuralmembers.• Determine the founding depth and calculate the size and bearing capacity of thepiles.• Calculate the size and amount of reinforcement of structural members.• Design the facilities to be installed on the pier.• Design corrosion protection for piles, structural members and pier facilities.• Refine detailed design of the pier.
Page 1 and 2: PORT WORKS DESIGN MANUALPART 2Guide
Page 3 and 4: 3FOREWORDThe Port Works Design Manu
Page 5 and 6: 5CONTENTSPageNo.TITLE PAGEFOREWORDC
Page 7 and 8: 7PageNo.4.3.1 Loading Conditions 45
Page 9 and 10: 91. INTRODUCTION1.1 PurposeThe purp
Page 11 and 12: 112. DESIGN CONSIDERATIONS OF PIERS
Page 13 and 14: 13sway and yaw, are subject to the
Page 15 and 16: 152.4.3 Environmental ImpactIt is i
Page 17 and 18: 17This will make berthing difficult
Page 19 and 20: 19below the pier deck in the case o
Page 21 and 22: 21provide a larger energy absorptio
Page 23 and 24: 23• The design of the vertical po
Page 25: 25Where small vessels will use the
Page 29 and 30: 29maximum wave height H max . For d
Page 31 and 32: 313.4 MooringsBollards should norma
Page 33 and 34: 33depending on whether preliminary
Page 35 and 36: 35chloride content exceeds the thre
Page 37 and 38: 37water or aggressive ions into con
Page 39 and 40: 39against corrosion for the design
Page 41 and 42: 41Section 8 of the GS requires all
Page 43 and 44: 434. SOLID PIERS4.1 GeneralTypical
Page 45 and 46: 45For overturning, it is recommende
Page 47 and 48: 47Manual.Reference should be made t
Page 49 and 50: 494.8 Construction4.8.1 GeneralThis
Page 51 and 52: 51For rock armour layers and underl
Page 53 and 54: 535. DOLPHINS AND FLOATING PIERS5.1
Page 55 and 56: 55Rigid dolphins may be of solid co
Page 57: 57pontoon. The dimensions and incli
Page 60 and 61: 60The Wu Kai Sha Public Pier (Plate
Page 63 and 64: 63REFERENCESBSI (1988). Maritime St

Port Works Design Manual : Part 2

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