International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
Analysis of Building with Soft Storey during Earthquake Shamshad Ali1, Farhan Malik2, Tanmay Sonone3, Bhushan Kalbande4, Harshala Agale5 1,2,3,4Students 5Asst.
of Civil Engineering, JD College of Engineering & Management, Maharashtra, India Professor, Dept. of Civil Engineering, JD college of Engineering & Management, Maharashtra, India
---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Nowadays soft storey is a typical feature in the
modern construction in urban India. At the soft storey in building, there is a discontinuity in the rigidity of the structure due to absence or lack of infill walls. Generally, the soft or weak storey exists at the ground floor level, but it could be at any other storey level of the building. In this study, seismic analysis of effects of soft storey building frames considering G+6 building, 5 models by varying the soft storey to different floors have been carried out. Soft storeys have been considered by same floor heights and effect of infill walls is ignored. For the analysis of building STAAD PRO v8i is used. Results are collected in terms of storey drift, storey, displacements & base shear.
get severely damaged. This is also known as inverted pendulum. Storey drift is the displacement of one level relative to the other level above or below.
Key Words: Storey, Stiffness, Lateral Displacement, Storey Drift. Fig -1: Building with soft storey
1. INTRODUCTION In recent time, reinforced-concrete framed structure in has a special feature that is the ground storey is left open for the purpose of social needs like vehicle parking, reception lobbies, a large space etc. Such buildings are often called open ground storey buildings or soft storey buildings. Soft storey buildings, having first storey's much less rigidity than the storey's above are particularly susceptible to earthquake damage because of large, unreinforced open space on their ground floors. Soft storey buildings are characterized by having a storey which has a large open space & as per IS 1893(part 1):2002, clause No.4.20, page No.10. It is one in which the lateral stiffness is less than70% of that in the storey above or less than 80% of the average lateral stiffness of the three storey above.
1.1 General Behavior of Soft Storey Open ground storey buildings have consistently shown poor performance during past earthquakes across the world. Presence of wall in upper storey makes them much stiffer than the open ground storey. Thus, the upper storey moves almost together as a single block, and large horizontal displacement of the building occurs in the soft storey level. Such a building behaves as an Inverted Pendulum which swing back and forth as shown in fig. 2(a), producing high stresses in columns and if columns are incapable of taking these stresses or do not posses enough ductility, they could Š 2017, IRJET
|
Impact Factor value: 5.181
|
Fig -2: Behavior of soft storey during earthquake
2. LITERATURE REVIEW 
Gaurav Joshi, K.K. Pathak and Saleem Akhtar(2013): In this study, seismic analysis of soft storey building
ISO 9001:2008 Certified Journal
|
Page 1005