EVALUATION OF MINIMUM THICKNESS REQUIREMENTS FOR RC TWO-WAY SLABS FOR DEFLECTION CONTROL
Volume Title: ICASGE2025
Paper ID : 1044-ICASGE-FULL (R1)
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Abstract
Practical engineers usually use minimum thickness provisions to fulfill deflection limit state requirements, especially at the beginning of their design. Researchers have raised lots of concerns regarding the efficiency of these provisions. This paper investigates the efficacy of deflection limit states requirements for two-way solid slabs provided by different international codes (i.e., ACI318-19, the Egyptian Code; ECP203-2020 & ECP203-2007, Eurocode2, and BS8110-1997). Finite element models were used to calculate the required minimum thickness for the deflection limit of (short span/250). Then, a comparison was conducted to compare the finite element analysis (FEA) results with that recommended by some international codes and also with the equation proposed by Scanlon & Lee 2006. Also, a parametric study was conducted to study the effect of slab spans, aspect ratio of the slab, slab continuity, the yield stress of the slab reinforcement, the applied live load and the concrete strength on the required slab thickness according to deflection limit state. It is concluded that, some design factors considered in the code equations such as the yield stress of reinforcement has a little effect on the values of slab minimum thickness. However, factors as concrete strength and applied loads were ignored in most codes. All studied codes, except the Egyptian code, do not consider precisely the effect of slab boundary conditions, which have a major effect when calculating the slab minimum thickness.
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