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Substitution of cold rolled hollow sections for hot rolled hollow sections

Report ID: cross158

Published: Newsletter No 16 - October 2009

Source: CROSS

Report Content

We, says another reporter, carry out the structural design work for a number of modular building manufacturers. Very recently we have been advised by two of them that their buyers have purchased cold formed hollow sections rather than the hot formed hollow section which we clearly identified in our calculations. (They have done this because cold formed sections are cheaper although of a lower specification.) We are concerned that buyers of structural materials sometimes seem to be cost driven and do not appreciate the importance of the steel grade. Whilst we have become aware of at least two instances where this has happened, and have been able to take steps to remedy it, there may be others where there are buildings with structurally inadequate members.

Comments

This is not the first time that SCOSS has become aware of unauthorised changes being made without the knowledge of the designers. The unauthorised use of non-structural steel box sections and changes to structural fixings are two more examples. It is difficult for the designer to prevent others from effecting changes other than by making it clear, on drawings, or in accompanying issue slips, that all changes are to be referred to the designer. 

Those responsible for value engineering also need to ensure that their decisions do not affect the original design criteria. Concerns of this type need to be brought to the attention of buyers and quantity surveyors. Designers need to remain vigilant to ensure that the materials they specify are used on site.

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