Abstract
In the present paper, nonlinear time history and response spectrum analyses were carried out using Etabs-2015 software to study the influence of soil condition beneath the isolated base. The effects of soil flexibility are considered in the current study to examine the differences in spectral acceleration, base shear, story displacements, story drifts and story shear obtained following the seismic provisions of Indian standard code. Various soils are systematically compared and discussed for a seismic performance of multistory buildings. Parametric analysis of the buildings fitted with isolation devices is carried out to choose the appropriate type of soil. The study shows that the value of base shear increases with an increase of soil flexibility and superstructure stiffness. It also observed that the spectral acceleration (SA) and spectral displacement (SD) are higher in soft soil condition, which gives us evidence that the response spectral of a structure is associated with soil condition. The paper concluded that the hard soil and medium soil are suitable for base isolation building. In addition, analysis and design considerations for base isolated and conventional structures are suggested to enable the designer to get a better understanding at the preliminary design stage.
Highlights
The soil condition is an essential field of analysis in earthquake engineering; this soil condition is defined as (Dexter 1988) “The physical condition of the soil and its dynamic properties, which can be divided according to standard Indian code into; hard soil (Rocky), medium soil, soft soil
The purpose of the study was to investigate the seismic performance of an isolated base building under various soil conditions according to IS code; the responses of the building, such as story displacements, story drifts, story forces, spectral acceleration at roof and spectral displacement have been studied
It is observed that the value of story shear increases with decrease in stiffness of soil and so forth; it is highest for the soft soil type (SS) and lowest for hard soil type (HS)
Summary
The soil condition is an essential field of analysis in earthquake engineering; this soil condition is defined as (Dexter 1988) “The physical condition of the soil and its dynamic properties, which can be divided according to standard Indian code into; hard soil (Rocky), medium soil, soft soil (loose). In spite of the buildings are of the same region, same configuration and same earthquake magnitude, the damages that occur during the earthquake are not of the same pattern (Jayalekshmi and Chinmayi 2016) This means that there are some factors that affect the damage pattern like ground motion characteristics, soil condition under foundations, structural system of plan, mass, stiffness, and vertical irregularities (Magade and Patankar 2008; Gjorgjiev 2012; Jain 2003). The present paper is discussing that the dynamic response of the structure is provided by isolators in the base of the structure under three altered condition of soil, which are: hard soil (I), medium soil (II) and soft soil (III), and discuss their seismic response such as, story displacement, story drift, story force, spectral acceleration and spectral displacement. The story displacement, story drift, story shear forces, spectral acceleration and spectral displacement were calculated for each floor and the graph plotted for each structure
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