Earthquake Hazard Mitigation for Rural Dwellings by P-F Base Isolation

Abstract eng:
The concept of seismic isolation is applied here to rural dwellings by separating the super structure from the foundation at plinth level by a sliding earthquake energy reducing friction layer in the form of Green marble-Green marble sliding couple. The dynamic interface property of this sliding interface has been investigated. Shake table tests is performed on ½ scaled single story base isolated brick masonry model supported by sliding interface subjected to an artificial accelerogram that is compatible with design spectrum of Indian standard (IS 1893 (Part 1): 2002) corresponding to the level of maximum considered earthquake in the most severe seismic zone (PGA=0.36g) in horizontal and 2/3rd of this acceleration in vertical direction. It is observed that the structure with green marble interface is quite effective in isolating the structure from support excitation. 70% reduction in absolute response acceleration at roof level for the isolated structure is obtained experimentally as compared to analytical fixed base structure at the cost of 50mm peak sliding displacement which is well within plinth projection of 75mm (3in) and can be used as a low cost pure friction (P-F) base isolation for rural masonry dwellings.

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