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Seismic Analysis of Low Rise Open Ground Storey Framed Building

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Abstract: Today in the metropolitan cities we are rapidly constructing multi-storey building for commercial and residential purposes but proper parking space is not available everywhere. Hence the trend has been made to use ground storey for the parking purpose so that ground storey is made open for parking purpose, no infill wall is provided in ground storey. The engineers did not consider strength and stiffness of the masonry wall, they think that it is traditional design. But this design is not always acceptable, especially for vertically irregular buildings with discontinuous infill walls. Hence the behavior of infill walls in the seismic analysis of framed building is prescriptive. Indian standard IS 1893: 2002 allows analysis of open ground storey building without taking infill stiffness but with a multiplication factor 2.5 in redemption for the stiffness discontinuity. As per the code the beam and columns of the open ground storey are designed for 2.5 times the storey shears and moments calculated under seismic loads of bare frames. But as per the experienced by the engineers the multiplication factor of 2.5 is not realistic for low rise open ground storey building. Hence the assessment of the multiplication factor and the effect of strength and stiffness in the seismic analysis of low rise low rise open ground storey building should be taken into account. Infill wall can be design in commercial software using two dimensional area elements with the properties of materials for linear elastic analysis. But this type of designed may not work for non-linear analysis until the non-linear material properties for a two-dimensional orthotropic element is not very well understood. Because the problem of open ground storey cannot be identified elastic analysis as the stiffness of open ground storey and bare frame is same. As per non-linear analysis of the OGS building fails through the soft storey mechanism at a comparatively low base shear and displacement and mode of failure is looks like a brittle. Hence seismic design of an existing reinforced concrete framed building would require a non-linear analysis. Hence in this paper area recommends a linear diagonal strut approach to model infill wall for both linear (Equivalent Static Analysis and Response Spectrum Analysis) and non-linear analysis (Pushover Analysis and Time History Analysis). In this paper we analyse RC framed building (G+3) with open ground storey located in Seismic Zone- V. In this study building analyzed for two different cases: (1) considering both infill mass and infill stiffness and (2) considering infill mass but without considering infill stiffness. In this analysis support conditions of the building also affect the significant parameter for the multiplication factor.

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Keywords: Infill Walls, Diagonal Strut, Open Ground Storey, Multiplication Factor, Seismic Analysis, Equivalent Static Analysis, Response Spectrum Analysis, Pushover Analysis, Low Rise Building.

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"Seismic Analysis of Low Rise Open Ground Storey Framed Building", International Journal of Emerging Technologies and Innovative Research ( | UGC and issn Approved), ISSN:2349-5162, Vol.4, Issue 12, page no. pp49-53, December-2017, Available at : &

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Published Paper ID: JETIR1712011
Registration ID: 170995
Published In: Volume 4 | Issue 12 | Year December-2017
DOI (Digital Object Identifier):
Page No: 49-53
ISSN Number: 2349-5162

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