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Abstract
This research introduces the real behaviour of R.C two-way slab with additional top and bottom corner reinforcement. Such reinforcement contributes in increasing the load carrying capacity as well as decreasing the resulting deformations.
For this purpose a numerical study has been performed to illustrate the effect of such reinforcement on the structural behaviour of R.C slabs. The 3D-FEM model through (ANSYS) software package has been used to accomplish this study, the eight node solid element is used to model the concrete, the study covered all the stages of stress-strain curve (elastic, elasto plastic). The reinforcement was modelled as a three-dimensional bar element. In this research different factors affecting the structural response of such slabs have been taken into consideration : (a)percentage of slab main reinforcement; (b) percentage of corner reinforcement as a ratio from the main reinforcement; (c) corner reinforcement spacing; (d) Dimension of edge beams; (e) slab rectangularity.
The results show that the existance of corner reinforcement in R.C two-way slabs improves considerably the structural behaviour of such slabs leading to higher ultimate load and lower values of deflection.
In this research the maximum midspan deflection and the ultimate load carrying capacity were recorded. It has been found for certain cases that the increase of load carrying capacity is up to (28%) and the decrease in central deflection of slab is up to (36%).
from this study it can be found that the distribution of corner reinforcement and its percentage from the main reinforcement has a significant effect on increasing ultimate load and decreasing the central deflection.