文档介绍：BS EN 13445-3:2009
EN 13445-3:2009 (E)
Issue 1 (2009-07)
Annex B
(normative)
Design by Analysis – Direct Route
Introduction
General
This annex is currently limited to sufficiently ductile materials, like the whole standard, but it is, ponents
operating in the creep range, also limited to sufficiently creep ductile materials.
NOTE The steels and steel castings listed in Table -1 of EN 13445-2:2009 for which, for the relevant temperature
range, creep strengths are given in the referred to material standards, are considered to be sufficiently creep ductile".
Purpose
Design-by-analysis (DBA) provides rules for the design of ponent under any action. It may be used:
⎯ as an alternative to design-by-formulas (see )
⎯ as plement to design-by-formulas for:
⎯ cases not covered by that route;
⎯ cases involving superposition of environmental actions;
⎯ cases where the manufacturing tolerances given in EN 13445-4:2009, Clause 5, are not fulfilled, in
agreement with the parties concerned.
In the last item, any deviations beyond tolerance limits shall be clearly documented.
Special requirements
Due to the advanced methods applied, until sufficient in-house experience can be demonstrated, the involvement
of an independent body, appropriately qualified in the field of DBA, is required in the assessment of the design
(calculations) and the potential definition of particular NDT requirements.
Creep design
ponents which, under reasonably foreseeable conditions, may operate in the creep range, the lifetime of
this creep load case (or the lifetimes for more than one of such load cases) shall be specified (by the user or his
representative). For each load case which includes operation in the creep range, the specified time for operation in
the creep range shall not be less than 10 000 h. If none is specified, the manufacturer shall assume a reasonable
time, but at least 100 000 h.
NO