A Study on Strengthening of Bubble Deck Slab with Elliptical Balls by using GFRP Sheets

Bubble deck slab technology is a method of virtually eliminating concrete from the middle section of the slab and thereby reduce disadvantages caused by self-weight of the concrete. HDPE hollow balls replace the ineffective concrete in the slab. Generally HDPE spherical and elliptical balls were used for Bubble deck slab construction. Bubble deck slab with elliptical ball have better load carrying capacity than spherical balls .But the deformation of bubble deck slab with elliptical ball is greater than bubble deck slab with spherical balls. We have to reduce the deformation of bubble deck slab with elliptical balls by GFRP strengthening. Finite element analysis (FEA) was carried out by using the FEA software ANSYS .The bubble deck slabs with elliptical balls and bubble deck slabs with elliptical balls having GFRP sheets were subjected to uniformly distributed load with proper boundary conditions. The analysis was done on bubble deck slab using both M25 and M30 grade of concrete. Total deformation, Directional deformation and Equivalent stress (von-Mises stress) were studied. Then the results of bubble deck slab with elliptical balls and bubble deck slabs with elliptical balls having GFRP sheets were compared.