American Society of Civil Engineers


Seismic Strrengthening of Liquid-Storage Tanks with Energy-Dissipating Anchors


by Praveen K. Malhotra, M.ASCE, (Consulting Engr., 4941 Knightswood Way, Granite Bay, CA 95746)

Journal of Structural Engineering, Vol. 124, No. 4, April 1998, pp. 405-414, (doi:  http://dx.doi.org/10.1061/(ASCE)0733-9445(1998)124:4(405))

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Document type: Journal Paper
Abstract: The seismic performance of liquid-storage steel tanks can be improved by anchoring them to their foundations with energy-dissipating devices rather than with conventional anchors. Case studies are presented of two tanks—one broad and one slender—both anchored with torsional-beam steel dampers, which dissipate seismic energy by inelastic deformations induced by uplifting of the tank wall. Numerical results show that tanks anchored with steel dampers experience significantly less foundation overturning moment than similar fully anchored tanks. Relative to unanchored tanks, the tanks anchored with steel dampers experience smaller values of base uplift, plastic rotation at the plate boundary, hoop stress in the wall, and radial separation between the plate and foundation. In general, tanks anchored with dampers exhibit superior performance to that of similar unanchored or fully anchored tanks. Due to savings in the material of tank wall, foundation, and full base anchorage, the use of energy dissipating anchors is likely to be cost-effective.


ASCE Subject Headings:
Anchors
Damping
Energy efficiency
Hydrodynamics
Seismic effects
Storage tanks