Investigation of Behaviour of Flat Slab with Openings Adjacent to Column of Different Shapes Using CSI-SAFE

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Published Sep 14, 2021
Jaicky Gurnani

Abstract

The flat slab system is currently widely used in various types of building structures including shopping malls, hospitals, and office buildings due to its various advantages. It permits architectural flexibility, easier formwork due to the absence of beams, more clear space, reduced story height, shorter construction time, etc. In addition, it is commonly used in high-rise buildings for different purposes or in buildings with flexible spatial arrangements over their lifetime. A flat slab is a highly frequent and aggressive structural system, where the columns directly support floor slabs without any beams [1]. The flat slabs may have openings for architectural flexibility like stairways, elevators, the transition of gas, electricity, water and air-conditioning systems, etc. The opening causes a discontinuity in the natural load path of the structure. That leads to an unbalanced shear force and bending moments. The major challenge in designing a flat slab is to consider the punching shear capacity. Providing an opening influences the punching ability of the structure. Punching shear is a sudden failure that can lead to the collapse of the entire structure. This will increase the effect of critical forces like punching shear, deflection, and moments. These forces increase when an opening has placed a location that cuts the path of the load to the column. [2–4]. Providing an opening makes the situation critical, but among those situations, providing an opening adjacent the column is the most critical. [5, 6]. The impact of openings on the shear behaviour of flat slab and column systems should be carefully examined [7, 8]. The effects of these openings adjacent to the column on the shear behaviour of flat slab systems need to be carefully examined [9, 10]. Thus this research carried out represents the numerical analysis and study of the behaviour of different types of flat slabs having different types of openings adjacent to columns for serviceability and collapse states. In this paper numerical analysis includes group A (Flat slab with no drop and no column head) & group B (flat slab with drop and with column head). And Group A and Group B are further subdivided into five parts of models with no opening, square opening, circular opening at a varying distance of opening from the facing column, square opening, and circular opening at the center of the slab in the behaviour of flat slabs. In this research square opening of size, 500mm x 500mm, and a circular opening of diameter 564.20 mm is considered. The analytical study has been done by using CSI-SAFE v16 (Slab Analysis by the Finite Element Method) for Group A and Group B as per IS 456:2000. This research is conducted to know the behaviour of different types of flat slabs with different opening shapes on the behaviour of flat slabs with opening and without opening. Also, the different positions of opening from the column face on the behaviour of different types of flat slabs have been studied. The work is extended for the combination of drop and column head and aspect ratio (length/width) on the behaviour of flat slabs. The effects on the behaviour of flat slabs with the parameters with different positions of opening behaviour of flat slabs like span, slab thickness, column dimensions are kept constant. As per the analytical result, various conclusions and recommendations are proposed in the research.

How to Cite

Gurnani, J. (2021). Investigation of Behaviour of Flat Slab with Openings Adjacent to Column of Different Shapes Using CSI-SAFE. SPAST Abstracts, 1(01). Retrieved from https://spast.org/techrep/article/view/333
Abstract 10 |

Article Details

Keywords

Flat slab system, Flat slab model, opening in slab, punching shear, deflection, SAFE

References
References
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Section
GE5- Industrial and System Engineering