EVALUATION OF ONE-WAY FLEXURAL BEHAVIOUR OF BIAXIAL VOIDED SLAB

摘要

In recent years, different types of innovative slab systems are being developed and adopted all over the world. Voided slabs are one such slab system that reduces the self-weight up to 50 % in comparison with solid slabs without any significant change in its structural performance. One of the innovative slab systems namely two-way hollow core slab system (biaxial voided slab) consists of void formers with various shapes like spherical, donut, cuboid, etc. Experimental and analytical investigations were carried out to study the behaviour of biaxial cuboid voided slab under one-way flexure. Voided slab specimens were prepared and tested with commercially available cuboid void former, which is manufactured using recycled polypropylene. Comparison of experimental and analytical (using yield line analysis in conjunction with Indian Standards) studies shows that the ultimate load carrying capacity of voided slabs are approximately 90% of solid slab. From this study it is concluded that the yield line analysis can also be applied to biaxial voided slabs. Also, the stiffness (at yield) reduction in comparison with solid slab is about 40%. It is also found that the behaviour of voided slabs under one-way flexure can be predicted by provisions of Indian Standards with necessary correction for loss of cross-section caused by voids.