Abstract
The performance of a well-designed layer of sand, and composites like layer of sand mixed with shredded rubber tire (RSM) as low cost base isolators, is studied in shake table tests in the laboratory. The building foundation is modeled by a 200 mm by 200 mm and 40 mm thick rigid plexi-glass block. The block is placed in the middle of a 1m by 1m tank filled with sand. The selected base isolator is placed between the block and the sand foundation. Accelerometers are placed on top of the footing and foundation sand layer. The displacement of the footing is also measured by LVDT. The whole setup is mounted on a shake table and subjected to sinusoidal motions with varying amplitude and frequency. Sand is found to be effective only at very high amplitude (> 0.65 g) of motions. The performance of a composite consisting of sand and 50% shredded rubber tire placed under the footing is found to be most promising as a low-cost effective base isolator.
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Bandyopadhyay, S., Sengupta, A. & Reddy, G.R. Performance of sand and shredded rubber tire mixture as a natural base isolator for earthquake protection. Earthq. Eng. Eng. Vib. 14, 683–693 (2015). https://doi.org/10.1007/s11803-015-0053-y
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DOI: https://doi.org/10.1007/s11803-015-0053-y