ANALYSIS OF TWO-WAY (WAFFLE) COMPOSITE SLABS

.m Khalaf; A. El-Shihy; H. Shehab; s. Mustafa

doi:10.66411/jer.v8i8.156

Authors

M. Khalaf Civil & Arch. Eng. Dept., Fac. of Eng Author
A. El-Shihy Jefarah Branch, Al-Fateh University, Tripoli, Libya Author
H. Shehab Jefarah Branch, Al-Fateh University, Tripoli, Libya Author
S. Mustafa Structural Engineering Dept., Faculty of Engineering, Zagazig University, Zagazig, Egypt Author

DOI:

https://doi.org/10.66411/jer.v8i8.156

Keywords:

Composite, Real, Waffle, Equivalent, Grillage, Slabs, Concrete, Steel Sheet, Two-Way, Profiled, Structures, Corrugated

Abstract

For few decades and since the well–known composite slabs consisting of reinforced concrete poured on corrugated steel sheet was achieved, the use of composite structures has grown widely. However, and since this type of slabs acts as a one-way slab due to the steel sheet ribs configurations, some problems have been created such as having two parallel heavily loaded beams in each panel while the other two perpendicular beams are almost unloaded; which is uneconomic.

Owing to the above reason and others, the idea of using two-way (or waffle) composite slabs was brought up. Carrying out such research required firstly choosing the most appropriate finite element modeling technique in representing the two-way or waffle composite slab and comparing its behavior to that of one-way. Three modeling techniques named real shape, equivalent and grillage models were tested and represented by two and three-dimensional finite element techniques to detect the best of them. Since no previous experimental, numerical or empirical results of waffle composite slab analysis were yet available to evaluate the modeling results, it was necessary to study also the behavior of the well-known one-way composite slab using the pre-mentioned modeling techniques. after the best finite element model was selected, an extensive parametric study; in which many influencing parameters were tested such as slab aspect ratio, slab boundary conditions, steel sheet depth, corrugation cell aspect ratio and its orientation; was carried out in order to investigate the overall behavior of two-way composite waffle slab under different conditions.

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