Abstract
A set of design rules have been developed that permit a detailed assessment to be made of large flat bottomed cylindrical bulk storage tanks subject to seismic loading. It is proposed that these should form an Appendix to the new British Standard BS7777. Equations and appropriate coefficients are developed to assess the stresses in the tanks shell due to impulsive and convective liquid mass effects, including hoop and axial stresses. Appropriate stress limits are proposed for both OBE and SSE events. Lift-off of the bottom due to rocking is considered, including limits on annular plate width and local peak foundation loads. A worked example is included showing use of the equations that are proposed for BS7777.
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