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Steel Designers Manual - TheBestFriend.org

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This material is copyright - all rights reserved. Reproduced under licence from The <strong>Steel</strong> Construction Institute on 12/2/2007<br />

To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.<strong>org</strong>/<br />

<strong>Steel</strong> <strong>Designers</strong>' <strong>Manual</strong> - 6th Edition (2003)<br />

Chapter 29<br />

<strong>Steel</strong> piles<br />

by TONY BIDDLE and ED YANDZIO<br />

This chapter is intended to serve as an introduction to the subject of steel piling and<br />

a source of reference for further reading where detail design is required. It is divided<br />

into two main parts, i.e. 29.1 for bearing piles and 29.2 for sheet piles.<br />

29.1 Bearing piles<br />

29.1.1 Uses<br />

Bearing piles are used mainly to support vertical loads for which the main design<br />

requirements are to restrict average settlement to a reasonable amount, eliminate<br />

differential settlement, and achieve an adequate factor of safety or load factor<br />

against overload.<br />

<strong>Steel</strong> piling offers many advantages compared with other types including:<br />

• Reduced foundation construction time and site occupation<br />

• Reliable section properties without need for onsite pile integrity checking<br />

• Inherently high strength to weight ratio<br />

• Higher end bearing resistance in granular soils and rocks mobilized by pile<br />

driving as compared with boring<br />

• Pile load capacity can be confirmed during driving by dynamic pile analysis<br />

(DPA) on each pile<br />

• Low displacement of adjacent soils during driving and no arisings<br />

• Easily removed for site reinstatement<br />

• Reusable or recyclable following extraction<br />

• Closer spacing possible.<br />

The ability to be transported and handled without concern for overstressing due to<br />

self-weight is an important consideration where piles need to be lifted, pitched and<br />

driven in long lengths, e.g. maritime structures. <strong>Steel</strong> piles can withstand high driving<br />

stresses, thereby enabling them to be installed without significant damage through<br />

difficult strata such as brownfield sites and subsurface layers of boulders or weathered<br />

rock. Energy-absorbing structures such as jetties and dolphins can be particularly<br />

well constructed in steel by virtue of its ability to offer large elastic deformation<br />

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