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DESIGN
AND
DETAILING
OF FLAT SLAB
ESE SOEDARSONO HS
27 FEBRUARY 2002

CONTENT
•
•
•
•
•
•

Introduction
Benefits
Design Considerations
Design Methodology
Analysis of Flat Slab
Detailing

INTRODUCTION
What is a flat slab?
• a reinforced concrete slab supported directly
by concrete columns without the use of
beams

INTRODUCTION

Flat slab

Flat slab with column head

Flat slab with drop panels

Flat slab with drop panel and column head

INTRODUCTION
Uses of column heads :
• increase shear strength of slab
• reduce the moment in the slab by reducing
the clear or effective span

Flat slab with column head

INTRODUCTION
Uses of drop panels :
• increase shear strength of slab
• increase negative moment capacity of slab
• stiffen the slab and hence reduce deflection

BENEFITS

BENEFITS
•
•
•
•
•
•

Flexibility in room layout
Saving in building height
Shorter construction time
Ease of installation of M&E services
Prefabricated welded mesh
Buildable score

Benefits .. .. ..
Benefits

FLEXIBILITY IN ROOM LAYOUT
• allows Architect to introduce partition walls anywhere
required
• allows owner to change the size of room layout
• allows choice of omitting false ceiling and finish soffit
of slab with skim coating

Benefits .. .. ..
Benefits

SAVING IN BUILDING HEIGHT
• Lower storey height will reduce building weight due to
lower partitions and cladding to façade
• approx. saves 10% in vertical members
• reduce foundation load
Slab
Slab

Slab
Slab

Bea mm
Bea

3.4m
3.4m

2.8m
2.8m

Conventional

2.8m
2.8m

3.2m
3.2m

Beam-Free

Benefits .. .. ..
Benefits

SHORTER CONSTRUCTION TIME
flat plate design will
facilitate the use of
big table formwork to
increase productivity

Benefits .. .. ..
Benefits

SINGLE SOFFIT LEVEL
26
26
Kitchen 30
30 00
Kitchen

Living
ing
Liv
Roo mm
Roo

Toile
lett
30 Toi
30

Shower
wer
Sho
75
75
155
155

Balcony
Balcony
30
30

Yard
Yard
30
30

Single Level
Ceiling

Flat Plate Slab

• Simplified the table formwork needed

Benefits .. .. ..
Benefits

EASE OF INSTALLATION
OF M&E SERVICES
• all M & E services can be mounted directly on the
underside of the slab instead of bending them to
avoid the beams
• avoids hacking through beams

Benefits .. .. ..
Benefits

PRE-FABRICATED WELDED MESH
• Prefabricated in
standard sizes
• Minimised
installation time
• Better quality
control

Benefits .. .. ..
Benefits

BUILDABLE SCORE
• allows standardized structural members and
prefabricated sections to be integrated into the
design for ease of constructi...
DESIGN
AND
DETAILING
OF FLAT SLAB
ESE SOEDARSONO HS
27 FEBRUARY 2002
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