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A platform for research: civil engineering, architecture and urbanism
Non linear vertical-rocking isolation system: Application to legged wine storage tanks
HighlightsA novel seismic isolation system was proposed for legged wine storage tanks.A numerical validation of the devices was performed.Experimental validation of prototypes.Non-linear history analysis and fragility analysis show a better performance when the proposed isolation system is used.
AbstractIn the last 30years, there has been a great development of seismic isolation systems. The most used are elastomeric type devices and frictional pendulum bearings. Although different, both types generate horizontal seismic isolation, but not vertical. This study presents a nonlinear three-dimensional seismic isolation system called vertical rocking isolation (VRI) system, based on devices called ISO3D. Unlike conventional seismic isolators, the ISO3D device is vertically flexible and laterally stiff. Although the proposed system can be applied to any type of structure, it is particularly attractive as a seismic protection system of special structures, such as fluid storage tanks supported on legs, power transformers and sensitive equipment with vertical acceleration. In this research an application to legged wine storage tanks is presented. Two models were studied: a 3m3 tank with 4 legs, and a 30m3 tank with 6 legs. The fluid-structure interaction was considered using a quasi-static approach, where the fluid behaves as a mass attached to the tank walls. Time-history analyses results show average reductions of axial loads and shear loads on the legs of 57% and 61%, respectively. Finally, a fragility analysis indicates that the PGA required to reach 50% of probability of failure increases by an average of 153% by using the VRI system.
Non linear vertical-rocking isolation system: Application to legged wine storage tanks
HighlightsA novel seismic isolation system was proposed for legged wine storage tanks.A numerical validation of the devices was performed.Experimental validation of prototypes.Non-linear history analysis and fragility analysis show a better performance when the proposed isolation system is used.
AbstractIn the last 30years, there has been a great development of seismic isolation systems. The most used are elastomeric type devices and frictional pendulum bearings. Although different, both types generate horizontal seismic isolation, but not vertical. This study presents a nonlinear three-dimensional seismic isolation system called vertical rocking isolation (VRI) system, based on devices called ISO3D. Unlike conventional seismic isolators, the ISO3D device is vertically flexible and laterally stiff. Although the proposed system can be applied to any type of structure, it is particularly attractive as a seismic protection system of special structures, such as fluid storage tanks supported on legs, power transformers and sensitive equipment with vertical acceleration. In this research an application to legged wine storage tanks is presented. Two models were studied: a 3m3 tank with 4 legs, and a 30m3 tank with 6 legs. The fluid-structure interaction was considered using a quasi-static approach, where the fluid behaves as a mass attached to the tank walls. Time-history analyses results show average reductions of axial loads and shear loads on the legs of 57% and 61%, respectively. Finally, a fragility analysis indicates that the PGA required to reach 50% of probability of failure increases by an average of 153% by using the VRI system.
Non linear vertical-rocking isolation system: Application to legged wine storage tanks
Auad, Gaspar A. (author) / Almazán, José L. (author)
Engineering Structures ; 152 ; 790-803
2017-09-29
14 pages
Article (Journal)
Electronic Resource
English
Seismic reliability of legged wine storage tanks retrofitted by means of a seismic isolation device
| Online Contents | 2017