End term seminar ppt on bubble deck slab which includes work done by ANSYS software

1. SEMINAR PRESENTATION ON
BUBBLE DECK SLAB
GUIDED
BY:
Dr. Shilpa
Pal
PRESENT
BY:
Shivani
Sharma
DEPARTMENT OF CIVIL
ENGINEERING

2. CONTENTS
S.No. Topics
1. Introduction
2. What Is The Principle Behind
3. Materials
4. Types of Bubble Deck Slab
5. Methodology
6. Literature Review
7. Applications
8. Advantages and Disadvantages
9. Analysis Done By ANSYS
10. Results
11. Conclusion
12. References

3. INTRODUCTION
 BUBBLE deck slab is a biaxial hollow core slab invented
in Denmark.
 It is a method of virtually eliminating all concrete from
the middle of a floor slab which is not performing any
structural function thereby dramatically reducing
structural dead weight.
 High Density Polyethylene hollow spheres replace the
in-effective concrete in the centre of the slab.

4.  Void formers inside the flat slab eliminates at least 30%
of a slab’s dead weight.
 Combination of this with a flat slab construction
approach spanning in two directions - the slab is
connected directly to in situ concrete columns without
any beams- produces a wide range of cost and
construction benefits.

5. WHAT IS THE PRINCIPLE BEHIND?
 The area between columns of a solid slab has limited
structural effect beyond adding weight.
 Replacing this area with a grid of “voids” sandwiched
between layers of reinforcing welded wire steel and an
internal lattice girder yields a slab typically 35% lighter
that performs like solid reinforced concrete.

6.  Once the steel lattice/void “sandwich” is concreted, it
is then precast into panels of various sizes and craned
into position on shoring.

7. • Once concrete is poured over the balls in the panels, the
Bubble Deck system effectively becomes, and behaves like,
a monolithic two-way slab that distributes force uniformly
and continuously.

8. MATERIALS
PLASTIC SPHERES
 hollow spheres made from
recycled High Density
Polyethylene).
 Enough strength (90% of solid
slab) & rigidity.
STEEL
( Steel reinforcement is of
MS or HYSD can be used ).
CONCRETE
Concrete is made up of Standard Portland
Cement with max aggregate size of 20mm.

9. TYPES OF BUBBLE DECK SLAB
Cast in Situ Filigree system or Precast
Half Slab
The simple Bubble Deck is cast over the
pre-fabricated ‘bubble lattice’ on
traditional formwork. The simple
Bubble Deck may also be delivered to
the building site as pre-cast factory-
made slabs.
In the precast half-slab Bubble Deck
System, the bottom side of the ‘bubble-
lattice’ unit is furnished with a pre-cast
concrete layer which on the building site
replaces the horizontal part of the
formwork

10. METHODOLOGY
 Conventional slab: This is a slab with
specifications prepared to analyze experimentally
with normal concrete of grade M30 by adopting
conventional method of design according to IS
456:2000 & IS 10262:2009.
 Bubble deck slab: The Bubble slab can be casted
as per DIN 1045 (1988) or DIN 1045 (2001) code
(German code).
 Finite element analysis performed using software
like ANSYS, ABAQUS SAP, FreeCAD etc and
form numerical model and compare the results.

11. S.N
O.
TITLE AUTHOR ABSTRACT CONCLUSION
1. An experimental
study on bubble
deck slab
system with
hollow elliptical
balls.
Nagesh
Hanche and
Arati Shetkar
The author
studied the
use of Hollow
plastic balls in
the reinforced
concrete slab
and its
effects.
•They founded that 50%
dead weight reduction
compared to solid slab ,
less CO2 emission.
• Less concrete required .
•Load carrying capacity of
slab is depend on
arrangements of bubbles.
2. Experimental
study on bubble
deck slab
Prof. Nishant
Rajoria ,
Muhammad
Shafiq
Mushfiq
(IRJET)
To determine
load bearing
capacity and
to estimate
amount of
concrete
saved.
•Results shows bubble
deck slab carried less
load due to stiffness
reduction because of
plastic balls introduce in to
the slab.
• 10.55-25% of concrete
saved as compare to solid
slab.
LITERATURE REVIEW

12. S.NO
.
TITLE AUTHOR ABSTRACT CONCLUSION
3. Punching shear
strength
development of
bubble deck slab
using GFRP
(Glass fiber
reinforced
polymer)
stirrups.
Reshma
Mathew,
Binu.P
This paper
compared the
punching shear
behavior of bubble
deck slab to solid
slab by using
ANSYS software.
•Compared to solid slab
punching shear
capacity of bubble deck
slab is less .
• They used GFRP
strips with various
orientation as a
strengthening system
which increase load
carrying capacity up to
20%.
4. Finite element
analysis of
voided slab with
high density
polypropylene
void formers
Subramania
n, K* and
Bhuvanesh
wari , P
Analysis is
performed using
ANSYS software
on 6 specimens in
which 3 are solid
and others voided.
•Voided slab V30
removed nearly 20% of
the concrete but
undergoes similar
deflection and cracks
patterns like solid slab.
BY USING ANSYS SOFTWARE

13. APPLICATIONS
Functional applicability:
 Residential living, offices
 Utility and industrial buildings
 Apartments, villas etc.
 Schools
 Parking
 Hospitals
 Laboratories and factories.
 As a consequence of the reduced load, it is possible to achieve
larger spans than a solid slab.
 Cantilevers can be made 10 times the deck height.

14. ADVANTAGES DISADVANTAGES
 Reduced concrete usage –1 kg
recycled plastic replaces 100 kg of
concrete.
 Design freedom– flexible layout
easily adapts to irregular & curved
plan layouts.
 Reduced dead weight-35%
removed allowing smaller
foundation sizes.
 Longer spans between columns-
up to 50% further than traditional
structures.
Environmentally green and
sustainable – reduced energy &
carbon emissions.
 Thickness of slab is limited.
Punching shear capacity is
low.
Skilled labour required.
Conventional slab is less
deflect than bubble deck slab.
Load carrying capacity is less
than conventional slab.

15. ANALYSIS DONE BY ANSYS
SOLID SLAB
VOIDED SLAB
Finite Element Analysis of Voided Slab with High Density
Polypropylene Void Formers

16. ANALYSIS DONE BY ANSYS
SOLID SLAB
BUBBLE DECK
SLAB

17. RESULTS
 The maximum deflection observed for voided slab
was 19.52 mm by numerical methods.
 The maximum deflection observed for voided slab
having same specifications was 8.62 mm by using
ANSYS. Deflection is more during ANSYS
analysis because of material used, here material
used was structural steel .
 As there is difference between the engineering
properties given to the specimen which gives
different results from the research paper.

18. CONCLUSION
 Difference in engineering properties gives
inappropriate result during analysis.
 There is an error observed during analysis.
 Weight reduction is 50% compared to solid slab.
 Concrete usage reduced up to 10.55-25% as 1Kg of
recycled plastic replaces 100 Kg of concrete, reduces
CO2 emission.
 Punching shearing capacity is less so GFRP(Glass
Fiber Reinforced Polymer) stirrups with various
orientation is used as a strengthening system for
bubble deck slab.
 Reducing material consumption made it possible to
make the construction time faster and overall costs
are reduced by 8-10%.

19. REFERENCES
 Bhagyashri G. Bhade and S.M Barelikar.2016, AN Experimental
Study on Two Way Bubble Deck SLAB With Spherical Hollow Balls.
Int J Recent Sci Res. 7(6), pp. 11621- 11626.
 Sergiu Călin, Roxana Gînţu and Gabriela Dascălu, ”Summary of tests
and studies done abroad on the Bubble deck slab system”, The
Buletinul Institutului Politehnic din Iaşi, t. LV (LIX), f. 3, 2009.
 Martina Schnellenbach-Held and Karsten Pfeffer,”Punching behavior
of biaxial hollow slabs” Cement and Concrete Composites, Volume 24,
Issue 6, Pages 551-556, December 2002.
 Eurocode 2 Eurocode 2: Design of concrete structures - Part 1-1:
General rules and rules for buildings, British Standards Institution.
 www.bubbledeck.com
 http://www.bubbledeckuk.com/pdf/2BDTechManualv1a.pdf