Abstract: To build attentiveness about slenderness effect of column, this study is done with 15 flat-plate Reinforced Cement Concrete (RCC) structural models. Among these 15 models 45 columns of three locations (i.e. corner, edge and inner columns) are identified for study. First the methods describe in the ACI code for designing slender column is reviewed and then Finite Element Method (FEM) models are developed using ETABS. Parametric study is performed by considering: five different length of column from range of 10′(3048 mm) to 20′(6096 mm) using an increment of 2.5′(762 mm) and three slab panelsof size 15′x15′ (4572 mm x 4572 mm), 20′x20′ (6096 mm x 6096 mm), and 25′x25′(7620 mm x 7620 mm) with three panels in both way, with both gravity and environmental loads. It is observed that, columns in flat-plate structures are very sensitive to become slender. Corner and edge column has most slenderness effect. Column height increase on and beyond 17.5' (5334 mm) is substantially vulnerable for sway effect. Steel ratio increases suddenly when column length increases from one particular stage to another or column section decreases a little.In many cases, a column is not slender by considering now-sway frame but very slender by considering sway frame. For this reason, a designer should check a column for both non-sway sway conditions. Finally, ACI code for column design guidelines seems satisfactory with some outliers in column slenderness evaluation for flat-plat structures.
Keywords: Finite Element Method, Slenderness, Sway, Non-sway, Flat-plate.
Title: FEM Approach to Perform Parametric Study on Slender Columns for Flat-Plate Structures
Author: Mohammad Hossain, Tahsin Hossain
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
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