"Form... found that the construction of the stiffening rings significantly influenced the safety factor (BSF) and structural buckling stability... He showed that adding 2, 3, or 4 stiffening rings to the cooling tower increase the BSF of the R.C. shell by a factor of 1.65, 2.32, and 2.80, respectively."

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MathematicsEngineeringArchitecture
Original Language: English

Sources

Ref: J. Form, "The ring-stiffened shell of the ISAR II nuclear power plant natural-draught cooling tower," Engineering Structures, vol. 8, no. 3, p. 199-207, 1986.