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Abstract

In the event of a major submarine earthquake, not only severe ground shaking but also high tsunami waves are expected causing a significant threat to coastal structures and community. Tsunami forces on structures mainly depend upon the configuration of the structure, tsunami run-up heights and soil conditions. In the present study, two structures; one a conventional school building and the other an elevated water tank with typical configuration of slender staging and top heavy mass, are chosen for the analysis. Lateral loads at different floor levels of the building and water tank are worked out for different tsunami heights using the guidelines provided by Harry Hey et al. Spring constants of different soils are determined using the formulae developed by Whitman and Richart. Base shears and displacements are obtained when these structures rest on different types of soils and the results are compared with the values obtained when the structure is assumed to be fixed at the base. Assuming linear elastic behavior, SAP 2000 software is used for the analysis. From the result analysis, it is observed that the time period of slender structures (water tank) is more compared to stiff structures (Building) and these time periods decreases with increase of soil stiffness. It is further observed that, base shears increase with increase of soil stiffness and displacements decrease with increase of both structure as well as soil stiffness.