Uses of Bearing Piles - Steel Structures.

Bearing piles are used mainly to support vertical loads for which the main design requirements are to restrict average settlement to a reasonable amount, eliminate differential settlement, and achieve an adequate factor of safety or load factor against overload.

Steel piling offers many advantages compared with other types including:

• Reduced foundation construction time and site occupation
• Reliable section properties without need for onsite pile integrity checking
• Inherently high strength to weight ratio
• Higher end bearing resistance in granular soils and rocks mobilized by pile driving as compared with boring
• Pile load capacity can be confirmed during driving by dynamic pile analysis (DPA) on each pile
• Low displacement of adjacent soils during driving and no arisings
• Easily removed for site reinstatement
• Reusable or recyclable following extraction
• Closer spacing possible.

The ability to be transported and handled without concern for overstressing due to self-weight is an important consideration where piles need to be lifted, pitched and driven in long lengths, e.g.maritime structures. Steel piles can withstand high driving stresses, thereby enabling them to be installed without significant damage through difficult strata such as brownfield sites and subsurface layers of boulders or weath- ered rock. Energy-absorbing structures such as jetties and dolphins can be particularly well constructed in steel by virtue of its ability to offer large elastic deformation

and bending strength without affecting its durability. On projects such as river or estuary crossings, steel piles offer clear advantages, as the soils are typically granular and waterlogged and unsuitable for satisfactory pile boring. New applications such as supports and abutments for integral bridges offer more  economic con- struction methods and the property of compliance under lateral loading that reduces bending stresses and therefore section requirements.

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