Improvement of Structural Behaviour of Bubble Slab by Changing Bubble Thickness

Abstract

Deflection of slab is the most important parameter by which we can calculate the depth of slab which is depend on total loads applied on the slab and span of slab between two column. The concept of bubble slab in which middle layer concrete is replaced by HDPE bubble which will helps to reduced its self-weight, deflection, moments & force reactions. The criteria of choosing suitable thickness of HDPE bubble are well mentioned in this paper with suitable examples so we can easily use that thickness value in practical on site. Static analysis of several models is done by finite element analysis method with tetra meshing by using Ansys ver. 15.0 as an analyzing tool. In this paper, results clearly specifies the structural behaviour change of bubble slab by changing its HDPE bubble thickness as well as its also specify the best thickness value of HDPE bubble. Bubble slab will be more useful on those structures in which intermediates columns is not required when the span of conventional slab is large then its deflection, moments & force reaction values is greater by which its depth is increased which makes conventional slab heavy so its total self-weight loads are transfer to column to footing which makes both increases in size & uneconomical. If we used the concept of bubble slab our nearly 35% self-weight of slab is reduced which positively effect on load transfer to other structural members and by this procedure whole structure will be more stable, durable & economical.