This Design Recommendation is applied to the structural design, mainly the seismic design, of water storage tanks, silos, spherical storage tanks (pressure vessels), flat-bottomed, cylindrical, above-ground storage tanks and under-ground storage tanks.
As common requirements chapter 2 calls for material specifications which are applicable to the above -mentioned tanks, and chapter 3 calls for loads and buckling designs. Chapter 3 especially highlights the modified seismic coefficient method and the modal analysis as approved evaluation methods of seismic design based on the reference design acceleration response spectrum and the structural characteristic coefficient Ds.
The seismic design method adopted in the Recommendation is the allowable stress method modified with B, the ratio of the horizontal load-carrying capacity in the structure to the short-term allowable yield strength. The design for each tank is described in chapter 4 and onwards.
Chapters 4 and 5 call for general requirements of structural design of tanks and their supporting structures for water storage tanks and silos, respectively. Chapters 6 calls for requirements of seismic design only for supporting structures of spherical storage tanks. Chapters 7 and 8 calls for requirements of flat-bottomed, cylindrical above-ground storage tanks and under-ground storage tanks, respectively.
Source: Architectural Institute of Japan
Design of Water Tank
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