This paper discusses the load conditions to be applied in designing oil storage tank with outer flooting roof. This type of tank has been suffered severe damages by strong earthquake and/or big typhoon.
It is considered to some extent the damages come from the actual dynamic force which is not taken into account in the rules, standards and other specific documents for this type of tank today.
After analyzing the damages caused by large scale natural forces, author got some insights of load-characteristics. This paper proposes the application of dynamic force in design, adding to the on-going modified static forces defined as specific loads.
