International Research Journal of Engineering and Technology (IRJET) Volume: 04 Issue: 02 | Feb -2017
www.irjet.net
e-ISSN: 2395 -0056 p-ISSN: 2395-0072
AN ANALYSIS OF MULTI-STOREY BUILDING WITH FLOATING AND NON FLOATING COLUMN UNDER SEISMIC LOADING IN DIFFERENT ZONES. Mohd. Azaz1, Amarnath D. Burde2, Mohd. Yasin sheikh3, Lehazuddin Quazi4 1Assistant
professor, Dept. of Civil Engineering, Anjuman College of engineering and technology, Maharashtra, India 2Student of Graduation, Dept. of Civil Engineering, Anjuman College of engineering and technology, Maharashtra, India 3 Student of Graduation, Dept. of Civil Engineering, Anjuman College of engineering and technology, Maharashtra, India 4Student of Graduation, Dept. of Civil Engineering, Anjuman College of engineering and technology, Maharashtra, India. ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Floating columns are a typical feature in the
modern multistory construction in urban India and are highly undesirable in buildings built in seismically active and inactive zone areas. The present study investigates the effects of the structural irregularity which is produced by the discontinuity of a column in a building subjected to seismic loads in diff. zones. In this paper static analysis and conventional analysis using equivalent static method is done for a multistory building with and without floating columns in seismic zone-II & zone-V. Different cases of the building are studied by varying the location of floating columns floor wise, setback column and within the floor. The structural response of the building models with respect to Fundamental time period, Base shear, Storey drift and Storey displacements is investigated. The analysis is carried out using software STAAD Pro V8i software.
integral with the gravity load resisting system. Vertical irregularities typically occur in a storey that is significantly more flexible or weaker than adjacent stories. Many buildings with vertical discontinuities collapsed or were severely damaged during the 2001 Bhuj earthquake in Gujarat. Thus, buildings with columns that hang or float on beams, at an intermediate storey and, do not go all the way to the foundation, have discontinuities in the load transfer path. This paper presents the results of investigation of structural response quantities of a multi-storeyed building with floating columns.
Keywords—Floating columns, static analysis, Base shear, earthquake zone.
1. INTRODUCTION: Today many multi-storeyed buildings in India have floating columns as an unavoidable feature. This is being adopted- a) to provide more space in ground floor for accommodation of parking or ground lobbies b) for architectural beauty c) to increase floor space index. Fig. 1. Building with floating column Floating columns in a building may result in a concentration of forces or deflection or in an undesirable load path in the vertical lateral-forceresisting system. In extreme cases, this can result in serious damage or collapse of the building, since the lateral load resisting system is often Š 2017, IRJET
|
Impact Factor value: 5.181
|
(a) floating column: the column is discontinued at a lower level, and (b) set-back column: the column is moved out of plumb
ISO 9001:2008 Certified Journal
|
Page 998