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The Structural Engineer

This paper gives background information on the development of the NHBC Standard for building near trees - Chapter 4.2. It then reviews the recently published guidance, in Chapter 4.2 (1992), for heave precautions to foundations on shrinkable clay soils. Rev F.J. Atkins, R.W. Johnson and J.S. Barrett

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Author – Atkins, F J;Johnson, R W;Barrett, J S

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The Structural Engineer

The inelastic local buckling behaviour of cold-formed profiled steel sheets in the compression zone of a profiled composite beam is studied herein. The method considers a profiled composite beam in bending using a modflcation of the semi-analytical inelastic finite strip method. An inelastic constitutive relationship for cold-formed steel is used in the formulation of the clamped strip stiffness and stability matrices. A computer program incorporating material non-linearity has been developed that produces a new form of eigenvalue problem. A parametric study is undertaken for variables that influence the local buckling behaviour. Slenderness limits are derived that can be used for the rigid plastic design of cold-formed steel sheeting in profiled composite beams. B. Uy and Professor M.A. Bradford

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Author – Uy, B;Bradford, M A

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The Structural Engineer

This article examines two related questions: 1. How does an engineer get paid for work done where there is no contract with the client? 2. Where a client invites tenders from various engineers for a particular project, does the client have any obligation to consider all tenders received? Ian R. Yule

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The Structural Engineer

Sheet pile design Mr J. Botterill of Chessington, Surrey, points out some inconsistencies as between various commonly used treatments. In the design of sheet piling many engineers seem to rely on the BSC Piling handbook as the bible. But in the example laid out for the frequently used cantilever wall, the net pressure method is used, and there is no factor of safety at all against overturning! Verulam

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