Analisys of the Behavior of a Flexible Building With Single and Double Seismic Isolation

Abstract eng:
It is analyzed the seismic response of a 19 levels building for residential use typical from Mexico, said building structured with frames and wall made of reinforced concrete. It is also analyzed the seismic response of the building with a fixed-base and design alternatives were suggested adding seismic isolation in order to lessen the seismic response. Said alternatives were to add seismic isolation to the base using rubber isolators and friction isolators; also the response with double interface was analyzed using friction isolators in the buildings base as well as in the 7th floor´s base, with this the building behaved like two rigid blocks. The responses of each system are analyzed to determine advantages and disadvantages in each system to be used in a flexible building with 63.5 m height. The response of the structure is obtained via non-linear time-history analysis. Responses show problems when the rubber isolators where used due to the lack of post-fluency sturdiness necessary to return the structure to its original position after the quake. This problem was not present when the friction isolators were used, although, uplifting was present in 11 from 28 of the installed isolators in the structure. As an alternative to those situations it is studied the building´s response with a double interface isolation. The obtained result shows a significant reduction in the models with seismic isolation, reducing to a large degree the reinforcing steel in the sections.

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