Generally, foundations are designed for the settlement with respect to soil bearing capacity. In the case of a slender high-rise building, transmission tower, buildings in hilly areas are constructed on a sliding surface, high-rise structures are constructed on earthquake sensitive zone and high wind speed zone, affected with uplift and overturning forces. It is needed to provide some remedial measures, like vertically anchored foundation elements to resist the uplift and overturning forces considering soil-structure interaction effects. This study aims to examine how earthquake vibrations affect the behaviour of foundational reinforced concrete structures built on various soil types, both with and without anchor elements. On a ten-storey thin building, a couple of nonlinear time history analyses were conducted while taking into account the earthquake motions in Bhuj and Chamoli. The buildings were supported on Dense Sand and Gravels, Dry salty clay, Sandy clay and Lomy Sand having shear modulus (G’) 70 N/mm2, 35 N/mm2, 25 N/mm2 and 10 N/mm2, respectively. Based on nonlinear time history analysis, the results indicate that the anchor element foundation reduces the structure’s period and storey drifts. It also has substantial effects on base shear and global displacement. Result indicates reduction in uplift and overturning forces and foundation settlements.

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Soil–structure Interaction of Vertically Anchored Foundation Element with Respect to Earthquakes

  • S. J. Kadbhane,
  • D. J. Kadbhane,
  • C. D. Modhera

摘要

Generally, foundations are designed for the settlement with respect to soil bearing capacity. In the case of a slender high-rise building, transmission tower, buildings in hilly areas are constructed on a sliding surface, high-rise structures are constructed on earthquake sensitive zone and high wind speed zone, affected with uplift and overturning forces. It is needed to provide some remedial measures, like vertically anchored foundation elements to resist the uplift and overturning forces considering soil-structure interaction effects. This study aims to examine how earthquake vibrations affect the behaviour of foundational reinforced concrete structures built on various soil types, both with and without anchor elements. On a ten-storey thin building, a couple of nonlinear time history analyses were conducted while taking into account the earthquake motions in Bhuj and Chamoli. The buildings were supported on Dense Sand and Gravels, Dry salty clay, Sandy clay and Lomy Sand having shear modulus (G’) 70 N/mm2, 35 N/mm2, 25 N/mm2 and 10 N/mm2, respectively. Based on nonlinear time history analysis, the results indicate that the anchor element foundation reduces the structure’s period and storey drifts. It also has substantial effects on base shear and global displacement. Result indicates reduction in uplift and overturning forces and foundation settlements.