Shake Table Studies on the Response of Scale Model Framed Structure on Geotechnical Seismic Isolation System
Publication: Geo-Congress 2022
ABSTRACT
Seismic protection of buildings using the innovative concept of Geotechnical Seismic Isolation (GSI) has emerged as a sustainable and economical alternative to the conventional base isolation system. The GSI system comprises horizontal layers of high damping, adequate stiffness, energy-absorbing material sandwiched between the natural soil and the building foundation. The GSI layer enables the dissipation of the incoming seismic waves, thereby minimizing the transmission of seismic energy to the building structure. The present study aims to experimentally investigate the performance of a scaled model framed structure placed on a well-designed GSI system comprising of sand-rubber mixture, using laboratory shake table studies. A 5-storey scaled model framed structure is placed on the GSI system in the middle of a sand bed inside a laminar shear box and subjected to seismic excitations. The lateral displacement of the model structure resting on the GSI layer was substantially reduced by 30% at fifth floor level compared to that of pure sand condition without GSI. Overall, the seismic isolation capability of the GSI system was found to be effective for mid-rise framed structures in terms of reduced acceleration and displacement response at different floor levels of the building.
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Geo-Congress 2022
Pages: 349 - 359
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Published online: Mar 17, 2022
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