GSO EN 1998-4:2011
Gulf Standard
Current Edition
·
Approved on
12 April 2011
·
Eurocode 8 - Design of structures for earthquake resistance – Part 4: Silos, tanks and pipelines
GSO EN 1998-4:2011 Files
English
73 Pages
Current Edition
Reference Language
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GSO EN 1998-4:2011 Scope
(1) The scope of Eurocode 8 is defined in EN 1998-1: 2004, 1.1.1 and the scope of this
Standard is defined in this clause. Additional parts of Eurocode 8 are indicated in EN 1998-1:
2004, 1.1.3.
(2) This standard specifies principles and application rules for the seismic design of the
structural aspects of facilities composed of above-ground and buried pipeline systems and of
storage tanks of different types and uses, as well as for independent items, such as for
example single water towers serving a specific purpose or groups of silos enclosing granular
materials, etc.
(3) This standard includes the additional criteria and rules required for the seismic design
of these structures without restrictions on their size, structural types and other functional
characteristics. For some types of tanks and silos, it also provides detailed methods of
assessment and verification rules.
(4) This standard may not be complete for those facilities associated with large risks to the
population or the environment, for which additional requirements are the responsibility of the
competent authorities. This standard is also not complete for those construction works which
have uncommon structural elements and which require special measures to be taken and
special studies to be performed to ensure earthquake protection. In those two cases the present
standard gives general principles but not detailed application rules.
NOTE The National Annex may specify additional requirements for facilities associated with large risks
to the population or the environment.
(5) Although large diameter pipelines are within the scope of this standard, the
corresponding design criteria do not apply for apparently similar facilities, like tunnels and
large underground cavities.
(6) The nature of lifeline systems which often characterizes the facilities covered by this
standard requires concepts, models and methods that may differ substantially from those in
current use for more common structural types. Furthermore, the response and the stability of
silos and tanks subjected to strong seismic actions may involve rather complex interaction
phenomena between soil-structure and stored material (either fluid or granular), not easily
amenable to simplified design procedures. Equally challenging may prove to be the design of
a pipeline system through areas with poor and possibly unstable soils. For the reasons given
above, the organization of this standard is to some extent different from that of other Parts of
EN 1998. This standard is, in general, restricted to basic principles and methodological
approaches.
NOTE Detailed analysis procedures going beyond basic principles and methodological approaches are
given in Annexes A and B for a number of typical situations.
(7) In the formulation and implementation of the general requirements, a distinction has
been made between independent structures and redundant systems, via the choice of
importance factors and/or through the definition of specific verification criteria.
(8) If seismic protection of above-ground pipelines is provided through seismic isolation
devices between the pipeline and its supports (notably on piles), EN 1998-2:2005 applies, as
relevant. For the design of tanks, silos, or individual facilities or components of pipeline
systems with seismic isolation, the relevant provisions of EN 1998-1:2004 apply.
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