Matters specific to this Prestandard General

The scope of Eurocode 9 is defined in Part 1.1 and the scope of this Part of Eurocode 9 is defined in 1.1.

In using this Prestandard in practice, particular regard should be paid to the underlying assumptions and conditions given in 1.4.

In developing this Prestandard, background documents have been prepared, which give commentaries on, and justifications for, some of the provisions in the Prestandard.

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ENV 1999-2:1998 Use of annexes

The six chapters of this Prestandard are complemented by five Annexes, some normative and some informative.

The normative annexes have the same status as the chapters to which they relate. Most have been introduced by moving some of the more detailed Application Rules, which are needed only in particular cases, out of the main part of the text to aid its clarity.

Concept of reference standards

In order to use this Prestandard reference needs to be made to various CEN and ISO standards. These are used to define the product characteristics and processes which have been assumed to apply in formulating the design rules.

This Prestandard mentions certain "Reference Standards". Each Reference Standard makes reference to the whole or, part of, a number of CEN and/or ISO standards. Where any referenced CEN or ISO standard is not yet available, the National Application Document should be consulted for the standard to be used instead. It is assumed that only those grades and qualities given in normative Annex B of Part 1.1 will be used for buildings and civil engineering works designed to this Prestandard.

Partial safety factors

This Prestandard gives general rules for the design of aluminium structures which relate to the limit states of members and connections which involve structural failure due to fatigue.

Most of the rules have been calibrated against test results in order to obtain consistent values of the partial safety factors for resistance yMf.

Guidance is given on appropriate partial factors yFf for loading where the loading cannot be obtained from existing loading codes.

Fabrication and erection

Chapter 6 of this Prestandard is intended to indicate some minimum standards of workmanship and normal tolerances that have been assumed in deriving the design rules given in this Prestandard.

It also indicates the information relating to particular fatigue critical parts of a structure that the designer needs to supply in order to define the execution and maintenance requirements.

Design assisted by testing

Section 2.4 is not generally required in the course of routine design, but is provided, together with Annex C, for use in the special circumstances in which it may become appropriate.

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