Dynamic Analysis of Buildings With Floating Columns

Mohd Faiz Ahmed; mr narendar kumar; MOHAMMED JALAL UDDIN; DR KHAJA FAREED UDDIN

Dynamic Analysis of Buildings With Floating Columns

Authors: Mohd Faiz Ahmed, mr narendar kumar, MOHAMMED JALAL UDDIN, DR KHAJA FAREED UDDIN

Unique Paper ID: 181438
Volume: 12
Issue: 1
PageNo: 4416-4425

Keywords: Flat slab floating column response spectrum method seismic loading.

Abstract:
In Present era, Reinforced Concrete buildings with floating column is a typical feature in the modern multistory construction in India. Such features are highly importance of explicitly recognizing the presence of the floating column in the analysis of building. Past earthquake experiences demonstrate the fact that buildings with rectangular plan or box type buildings perform well than buildings with irregular shaped plans. During Bhuj (2001) earthquake, majority of the buildings got damaged were not designed for seismic loading and most of the buildings were not engineered. It also implicates that irregular buildings are undesirable as they do not possess sufficient seismic resistance. Hence, it is necessary that all buildings must be designed for seismic loading and irregular configuration must be avoided. However, irregular buildings are inevitable in few circumstances and hence, more attention has to be given in understanding their behaviour.This work investigates the comparative study on the dynamic analysis of multistory buildings with floating columns at various positions is evaluated by response spectrum analysis (as per the recommendation of IS1893:2002) with the help of ETABS 2017 software. The main parameters evaluated in this study are base shear, torsional moments, overturning moments, storey displacements, deflections and storey drifts. A total of 3 models and a building without floating columns are considered and compared with each other according to the position of floating columns and percentage variation with regular building is done. For each structural system 140mm thickness of the slab, square columns of 600mm size, square beams of 300mm size and varying thickness of drops of 2000mm size are considered. In each model G+4 stories are considered.It was observed that the torsional moments, overturning moments and base shear increases at central column float position as more load is concentrated at centre of the building with respect to regular building. By increasing the thickness of column drops to flat slab, storey displacements decrease as overall stiffness of building increases whereas drift values follow a non-linear path along storey height with maximum value laying the third storey. It was also observed that the change in the deflections is very less with respect to regular building at different positions in that storey where floating columns are located and these are under permissible limits.

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Cite This Article

ISSN: 2349-6002
Volume: 12
Issue: 1
PageNo: 4416-4425

Dynamic Analysis of Buildings With Floating Columns

Available:https://ijirt.org/Article?manuscript=181438

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