PARAMETRIC STUDY ON SLENDER COLUMN FOR FLAT PLATE STRUCTURE

Shinde S. S, Patil P. S

Abstract: This paper deals with effect of slender column on flat plate structure. The column is called slender if the height of is increased for functional purpose. The study is conducted on 18 flat-plate reinforced cement concrete (RCC) structural models. Among these18 models, 54 columns at three different locations (i.e. corner, edge and inner columns) are chosen for study. The models are developed using ETABS Software. Parametric study is performed by considering six different height of column ranging from 3048 mm to 6858 mm, using an increment of 762 mm along with three slab panels of size 4572 mm x 4572 mm, 6096 mm x6096 mm and 7620 mm x 7620 mm with five panels in both ways, considering both gravity and environmental load. The effect of slenderness ratio on load carrying capacity, design load and steel ratio is considered along with this the effect of additional moment due to slender compression member is also taken into account. It is observed that, columns in flat-plate structures are generally very sensitive if they are slender. It is observed that as the column length increases from 5502 mm and further, the steel ratio suddenly increases and it exceeds maximum allowed. As slenderness ratio increases, ratio of design load to the critical buckling load increases. Also resulting in increase of additional moment, decreasing load carrying capacity of column. This forces the design engineer to study effect of different parameter of the structure while designing high rise flat plate structure.

Keywords: Flat Plate Structure, ETABS, Slenderness, Environmental load, design load and buckling load

DOI: https://doi.org/10.15623/ijret.2015.0404080