The document outlines a presentation on the design of flat slabs and plates. It discusses the behavior and analysis of flat slabs, including their proportioning, shear design, reinforcement detailing, and failure due to punching shear. It notes the benefits of flat slabs but also discusses the challenge of resisting two-way shear around the columns. Examples of structural collapses from punching shear failures in Switzerland are provided.

1. 15 May 2020

2. 15 May 2020
Outline of Presentation
 Flat Plate and Flat Slab
 Behaviour of Flat Slab
 Proportioning of Flat Slab
 Method of Analysis
 Shear in Flat Plates and Flat Slabs
 Design Procedure
 Detailing of Reinforcement

3. Design of Flat Slab
 Two-way slabs directly supported on
columns, called flat plates.
 Simple formwork and reinforcement
layout and the potential for shorter
storey heights
 Problem posed by resisting two-way
shear around the columns, which is
called the punching shear
Flat Plate
Slab
directly
rests on
column
Flat Plate

4. Design of Flat Slab
Failure of Flat Slab
due to Punching Shear
Failure Mechanism of Flat Slab
due to Punching Shear
Failure Mechanism of Flat Slab
Structural Collapses due to
Punching Shear Failures in Switzerland
Underground Parking Garage, Bluche, 1981
(photo courtesy of R. Suter)
Shopping center, Serfontana, 1970
(photo courtesy of M. Ladner)

5. Design of Flat Slab
Flat Slab with Drop
Drop
Column Head
Flat Slab with Column
Head or Column Capital
Flat Slab with Drop &
Column Head
Column Head
Drop
Types of Flat Slab