Abstract

The conventional storage tanks are either fully restrained by hold-down connections or unanchored which are free for rocking motion during an earthquake. This generally creates a high level of seismic force due to lack of ductility or large displacement demand due to uplift, resulting in damage to tanks. However, a more efficient approach could be using partially restrained connections to control both the deflection and force at the desired levels.

In this paper, an innovative generation of anchorage system has been introduced by employing the Resilient Slip Friction Damper (RSFD) as a ductile self-centring hold-down system. This new tension-only damage-free anchorage mechanism mitigates the transmitted earthquake force to storage tanks by dissipating the input energy through friction without experiencing any damage, contrary to other common ductile yielding hold-downs.

In this study, based on the numerical modelling of the tanks and the hold-downs performance (validated experimentally), a comparison has been conducted between the RSFD anchorage system with other ductile concepts (eg., necked-rod and buckling-restrained systems), considering three case studies with different tank aspect ratios. The proposed system is capable of considerably decreasing the transmitted force which leads to less seismic demand for designing the tank barrel as well as the foundation.

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