Development of Rocking Isolation for Response Mitigation of Elevated Water Tanks under Seismic and Wind Hazards

Table 1

The characteristics of the equivalent simplified liquid-tank system calculated for the sample structures with various filling levels.

System parameters		Analytical values
		Full case	Half-full case	Empty case
Convective component	(ton)	667.0	513.2	—
	(m)	6.2	6.1	—
	(kN/m)	1463.1	866.3	—
	(kN.s/m)	9.9	6.7	—
Flexibility component	(ton)	1060.0	524.6	—
	(m)	5.8	5.4	—
	(kN/m)			—
Impulsive component	(ton)	181.3	76.8	358.1+
	(ton.m2)
	(m)	3.8	3.8	4.75++

The subscript “b” indicates that the equivalent heights are calculated with the inclusion of the effect of the pressure variation on the tank floor. ⁺Mass of the tank wall. ⁺⁺C.G. height of the tank wall.