International Journal of Civil and Structural Engineering Research ISSN 2348-7607 (Online) Vol. 7, Issue 1, pp: (26-36), Month: April 2019 - September 2019, Available at: www.researchpublish.com
A COMPARATIVE STUDY ON EFFECT OF OPEN GROUND STOREY BUILDING ON SEISMIC PERFORMANCE OF HIGH RISE BUILDING BY USING DIFFERENT PROVISION OF INFILL J.N. Sakhiya1, J.D. Gohel2 1
P.G. Student School of Engineering R.K. University
2
Assistant Professor Civil Engineering Department R.K. University
Abstract: This paper study on effect of open ground story on seismic performance of high rise building parking space for residential apartments in populated cities is a matter of major concern. Hence the trends has been to utilize the ground story of the building itself for parking. “Open Ground Story building are those type of building in which the ground story is free of any infill masonry walls. These types of building are very common in India for parking provisions. In generally open ground story column were either damaged severely or failed completely, there by damaging the building due to sudden reduction in lateral stiffness and mass in the ground story result in higher under seismic loading. To prevent the soft story failure a multiplication factor by static nonlinear analysis considering infill stiffness and strength. Keywords: Soft Story, Infill Masonry.
1. INTRODUCTION Open Ground Story buildings (Also known as Soft Story buildings) are commonly used in the urban environment nowadays since they provide parking area. According to IS 1893- 2002, Soft story is defined as story which has less than 70 percent lateral stiffness than story above or less than 80 percent of the average lateral stiffness of the three story above. From past earthquakes, this type of building shows comparatively higher tendency to collapse during earthquake due to soft story effect. For example, during the 1999 Turkey, 1999 Taiwan, 2001 Bhuj , India, 2005 Jammu and Kashmir, India and 2003 Algeria earthquakes, maximum damaged buildings were found to have open ground story. A reason behind collapse is hinge formation developed at ground story column due to large lateral displacement. Large lateral displacement at ground story column is due to stiffness of Infill wall during earthquake in actual behavior & building act as a Inverted Pendulum. For simplification in analysis, bare frame is considered without infill walls & all column is fixed for hard soil and hinged for soft soil. This neglects stiffness of infill walls and flexibility of soil below footing which gives inaccurate result than exact behavior during earthquake. To overcome this soft story effect IS 1893:2002 gives multiplication factor 2.5 to shear force & bending moment calculated under seismic force in bare frame for ground story elements(Column, Beam, Shear wall) in clause 7.10.3(a) without considering aspect Ratio of building, No. of bay, stiffness of infill walls & soil flexibility. The value of magnification factor suggested in various literatures is vary from 1.0 to 4.8, Yet there is no proper justification about this magnification factor.
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