Experimental Investigation of Shear Strength of Precast Pre-stressed Ribbed And Hollow Core Slab Units

altuhami aaltuhami, Osman Shallan, Abdel Aziz Abdel Aziz, Sherif salem

Abstract


Having the advantages of high quality and lower amount of materials for hollow
core slabs (HCS), the extrusion method is not without its drawbacks because it does
not allow shear reinforcement incorporation. However, the strength of HCS against
shear stresses is withstood by concrete section only and shear failure of hollow core
slab occurs suddenly without large deformation. Therefore, the question is what are
the structural benefits of HCS that can be attained by adding shear reinforcements?.
This paper is concerned with studying the effect of the presence of shear
reinforcements on enhancing the structural behavior of the HCS. An experimental
study was carried out on 5 full-scale precast pre-stressed modified hollow core
slabs specimens (MHCS) subjected to shear loads. Each MHCS panel is comprised
of longitudinal, transverse ribs and lower thin slab layer. The spaces between the
ribs and the lower concrete layer are filled with polystyrene foam blocks. The
results of two specimens were compared with that obtained from a hollow core slab
panel having the same dimensions, pre-stressed reinforcement concrete grade and
loading scheme. Results indicated that the ultimate shear capacity, failure modes,
and load deflection relationships of the proposed slabs are greatly improved by
using the suggested technique.

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