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5. Level 0, C and D criteria: primary constraints
Verification of level 0, C and D criteria concerns primary stresses: pressure, permanent loads (dead weight) and the inertial/primary part of the earthquake.
The pressure induces tensile stresses in the pipe, i.e. a diaphragm stress P m which must remain below the elastic limit S y .
Resistance to a bending moment (self-weight, primary part of the earthquake) can be studied in relation to the plastic modulus of bending, which, in the case of a solid rectangular section, is 1.5 times greater than the elastic modulus.
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Level 0, C and D criteria: primary constraints
Level A criteria
Bibliography
Software tools
PIPESTRESS version 3.8.0
Mathcad 2001
Regulations
American Society of Mechanical Engineers ASME NB-3000 2013 Edition
Rules for the Design and Construction of Mechanical Equipment for PWR Nuclear Islets RCC-M B 3000 2012 Edition
Structural Eurocodes – Bases de calcul des structures NF EN 1990
Eurocode 1 – Actions on structures NF EN 1991-1-3 (snow) and NF EN 1991-1-4 (wind)
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