Evaluation of Seismic Performance of Floating Column Building

Kishalay Maitra

doi:10.11648/j.ajce.20180602.11

Abstract

In the modern multi-story construction, floating column is an unavoidable feature of buildings. Such features are highly undesirable in building built in seismic prone areas. This study highlights the performance of floating column building and compared with normal building under seismic load. In this study, static and dynamic analyses using response spectrum method have been carried out for multi-story building with and without floating columns. Different cases of the building have been studied by varying the location of floating column and increasing the column size. The results showed that story displacement increased by 56.96% in floating column building compared to normal building. Torsional irregularity was found when floating column was introduced unsymmetrically. It was also found that fundamental time period was increasing in floating column building and lateral stiffness was decreasing in floating column building. When the lost cross sectional area due to floating columns were distributed among ground floor columns then it was found that story displacement as well as fundamental time period decreased and lateral stiffness increased.

Highlights

At present for better parking facilities, open first story is a common feature in commercial and residential building
The main objectives of this study is to evaluate the performance of floating column building
The behaviour of the buildings with and without floating columns are analyzed under seismic load

Summary

Introduction

At present for better parking facilities, open first story is a common feature in commercial and residential building. In every building load is transferred from horizontal members (beams and slabs) to vertical members (walls and columns) and to the foundation. A structure having floating column can be classified as vertically irregular as it causes irregular distribution of mass, strength and stiffness along the building height [11]. Absence of any column at any level of structure changes the load transfer path and load of this floating column is transferred through the horizontal beams below it, known as transfer girders [10]. Previous research showed the building which have floating column at ground floor have most adverse effect of earthquake. This paper explains the behaviour of multi-story floating column building and comparison between floating as well as without floating column structure and values of various parameters like story drift, story displacement etc. This paper explains the behaviour of multi-story floating column building and comparison between floating as well as without floating column structure and values of various parameters like story drift, story displacement etc. on the basis of seismic load

Objectives

Results

Conclusion