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DOE-STD-1020-2002
3.2.5 Design Guidelines
Reference 3-12 provides guidelines and details for achieving acceptable wind resistance
of SSCs. Seven principles should be followed in developing a design that meets the
performance goals:
(a)
Provide a continuous and traceable load path from surface to
foundation
(b)
Account for all viable loads and load combinations
(c)
Provide a redundant structure that can redistribute loads when one
structural element is overloaded
(d)
Provide ductile elements and connections that can undergo
deformations without sudden and catastrophic collapse
(e)
Provide missile resistant wall and roof elements
(f)
Anchor mechanical equipment on roofs to resist specified wind and
missile loads
(g)
Minimize or eliminate the potential for windborne missiles
3.3
Evaluation of Existing SSCs
The objective of the evaluation process is to determine if an existing SSC meets the
performance goals of a particular Performance Category.
The key to the evaluation of existing SSCs is to identify potential failure modes and to
calculate the wind speed to cause the postulated failure. A critical failure mechanism could
be the failure of the main wind-force resisting system of a structure or a breach of the
structure envelope that allows release of toxic materials to the environment or results in wind
and water damage to the building contents. The structural system of many old facilities (25
to 40 years old) have considerable reserve strength because of conservatism used in the
design, which may have included a design to resist abnormal effects. However, the facility
could still fail to meet performance goals if breach of the building envelope is not acceptable.
The weakest link in the load path of an SSC generally determines the adequacy or
inadequacy of the performance of the SSC under wind load. Thus, evaluation of existing
SSCs normally should focus on the strengths of connections and anchorages and the ability
of the wind loads to find a continuous path to the foundation or support system.
Experience from windstorm damage investigations provides the best guidelines for
anticipating the potential performance of existing SSCs under wind loads. Reference 3-13
provides a methodology for estimating the performance of existing SSCs. The approach is
directed primarily to structures, but can be adapted to systems and components as well. The
methodology described in Reference 3-13 involves two levels of evaluation. Level I is
essentially a screening process and should normally be performed before proceeding to Level
3-13


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