PERFORMANCE OF PRESTRESSED HOLLOWCORE SLABS WITH AND WITHOUT CUTOUTS

P Sameer Kumar Sarma, S. Suriya Prakash

Abstract: PrestressedHollowcore slabs are typicallyprecast using an extruder machine withprestressing strands as the only internal reinforcement. Various building servicesrequire cut-outs to be provided in these precast slabs.Cut-outs/openings in hollowcore slabs can coincide with the location of strands and may lead to their curtailment.An experimental study was carried out to evaluate the effect of cut-outs in hollowcore slabs. Four full scale tests were conducted by consideringtwo shear span to depth ratiosand out of which two slabs had flexural opening. The strength of concrete, prestressing ratio and size of opening was kept constant in all slabs. It was observed that, provision of cut-outs not only reduced the cracking and ultimate strength of slabs, but also altered the failure modeswith change in deformation capacity.

Keywords: Cut-outs/openings, Prestress Precast, Hollowcore slabs, shear span to depth ratio

DOI: https://doi.org/10.15623/ijret.2015.0425066