SEISMIC PERFORMANCE ASSESSMENT OF BASE ISOLATION SYSTEM ON SLOPING GROUND
Author(s):
Nikhil M.Gopale, Dr. V. R. Rathi
Keywords:
Base Isolation, Sloping Ground, Equivalent static method, Response Spectrum Method., double pendulum friction bearing
Abstract
The base isolation is technique that has been used to protect the structures from the damaging effects of earthquake. The installation of isolators at the base increases the flexibility of the building structures. Base isolation is not about complete isolation of the structure from the ground, as with magnetic levitation, which may be very rarely practical. Most of the base isolation systems that have been developed over the years provide only ‘partial’ isolation. ‘Partial’ in the sense that much of the force transmitted, and the consequent responsive motions are only reduced by providing flexibility and energy dissipation mechanisms with the addition of base isolation devices to the structure. Base isolation, as a strategy to protect structure from earthquake, revolves around a few basic elements of understanding, changing the time period of the structure: Base isolator is a more flexible device compared to the flexibility of the structure. Thus, coupling both an isolator and the superstructure together increases the flexibility of the total isolated structural system. In this way, this technique lengthens the structures natural time period away from the predominant frequency of the ground motions, thus evading disastrous responses caused due to resonance. In present study modeling and analysis RC building is done in ETABS software for three different sloping angles i.e. 25 , 30 and 35 . The structure is base isolated and the building considered for the study represents building on sloping ground. IS 1893 Part (I) -2016 Seismic response of building is compared with base isolation. The results obtained from analysis one represented through seismic response parameters such as displacement, storey drift, base shear and maximum forces. We have used lead rubber baring, double pendulum friction bearing and, tune mass damper for isolation.
Article Details
Unique Paper ID: 154122

Publication Volume & Issue: Volume 8, Issue 10

Page(s): 106 - 113
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