Aboveground storage tanks are susceptible to damage from many factors, including (but not limited to) environmental loads, process upset conditions, strength reduction due to metal loss, tank settlement, or some combination thereof. This damage often manifests as buckling of the tank shell, which is thin relative to its large surface area. Many tanks in service today have a fixed “cone” roof supported by structural members; much like the tank shell, these members are also susceptible to buckling failures as they must support loads while spanning long distances with minimal intermediate bracing. Buckling of tank roofs can lead to significant distortion of the tank shell, particularly localized in the top courses and at rafter connections. This shell distortion can create concerns regarding the capability of the shell to hold full product load.
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