Seismic Fragility Analysis of Steel Liquid Storage Tanks Using Earthquake Ground Motions Recorded in Korea

Table 4

Coefficients of the PSDMs.

Model type	Limit state
Unstiffened tank	Elastic buckling	0.0260	0.3335
	Elephant’s foot buckling	35.5397	0.1723
	Steel yielding	269.2661	0.2402
Ring-stiffened tank	Elastic buckling	0.0155	0.2942
	Elephant’s foot buckling	38.4978	0.3810
	Steel yielding	268.2180	0.2307