CE 5510 - 2004
Advanced Structural
Concrete Design
CE 5510 - 2004
Flat Slab System
• Column Heads
• Division of Panels
• Deflection
• Crack Control
• Shear
• Arrangement of Reinforcement
CE 5510 - 2004
Class Objectives
•Identify the types of slab construction, summarizing
the advantages and disadvantages of each
•Explain the methods of analysis of slabs
•Determine the design moments of one-way and two way
slabs
•Design of flat slabs covering:
division into strips, edge and corner columns,
punching shear and provision of shear
reinforcement
CE 5510 - 2004
Recommended Reading
• James G. MacGregor, “REINFORCED CONCRETE:
Mechanics and Design”, 3rd Ed., Prentice-Hall,
1997, Ch. 13 and 14.
• Allen, A. H., “REINFORCED CONCRETE DESIGN
TO BS8110 SIMPLY EXPLAINED”, E&FN Spon,
London 1988, Ch. 14
•The next few slides are from the Reinforced Concrete Council

384EI
=∆ kwl
4
CE 5510 - 2004
4
∆
AB
= k n
AB
l
y
4
∆
DE
= k n
DE
l
x
n
AB and
n
DE
are portions of total load intensity transferred to AB and
DE respectively.
Since ∆
AB
= ∆
DE
,
4

Assumption – supports are unyielding
If the supports of the single panel is flexible, e.g. beams,
columns, etc. the distribution of moment is more
complex.
Degree of stiffness of yielding support determines the
intensity of the steepness of the curvature contours in the
l
x
and l
y
direction and redistribution of moments.
CE 5510 - 2004
Two-way spanning slab
CE 5510 - 2004
CE 5510 - 2004
Mid Span
Moments
- corner supported
CE 5510 - 2004
Approximate
moment in
one direction
in slabs
supported on
columns at
corners
CE 5510 - 2004
Midspan
moment
-edge