DOI: 10.11648/j.jccee.20261103.14 ISSN: 2637-3890

Study on Implementation and Effectiveness of Base Isolation System Using Lead Rubber Bearing in a Residential Building at Bharuch, India

Agamoni Das, Debasish Bandyopadhyay
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The research presented herein investigates the ability of an adaptive seismic isolation system to protect the structure built in Bharuch, Gujarat, India subjected to earthquake ground motion. As Seismic hazards remain a challenge to engineers, to reduce loss of life and damage to property due to earthquake, Seismic Isolation technique has been adopted which causes reduction in earthquake forces by lengthening period of vibration of the structure. Seismic isolation for the structure was done using Lead Rubber Bearings (LRB) with four basic requirements, i.e. effective stiffness, damping, acceleration response and shear. This technical paper discusses performance evaluation of the Elastomeric isolators (LRB), based on tests carried out both on rubber compound and full-scale devices to simulate and evaluate actual performance of Isolators. The building is of 4-storeyed residential apartment was base isolated using LRBs. This study discusses the theoretical method or numerical analysis in ETABS for selection of dimension of LRB as well as the laboratory tests to verify the properties. The isolator system performs three functions: horizontal flexibility, energy dissipation and rigidity against normal lateral loads. The important isolator property; effective stiffness, damping, displacements were evaluated as per both theoretical and experimental investigations. Several trials have been conducted with respect to selection of dimensions, rubber hardness, shear modulus which is suitable to match the target design base shear and displacement of structure during design basis and maximum credible earthquake. Finally the selected LRB was found suitable to achieve the targeted base shear and displacement as per both numerical analysis and experimental investigation.

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