BUILDING TECHNOLOGY 5

Who patented a pioneering reinforced system?

Francois Hennebique

Who developed the pre stressed concrete in the 1920s?

Eugene Freysinnet

When was fiber-reinforced concrete discovered?

1960s

When did pre stressed concrete first appeared

1888

Who was granted the first patent for pre stressed concrete design?

P.H Jackson

It is a form of reinforced concrete where it builds incompressive stresses during construction.

Pre stressed concrete

It is a type of reinforced concrete where it's a combination of steel and concrete that takes advantages of the strengths of each material.

Pre stressed concrete

2 types of pre stressed concrete tensioning

1. Pre tensioning

2. Post tensioning

A type of tensioning where placing the concrete around the reinforcing tendons that have been stressed to the desired degree.

Pre tensioning

Type of tensioning where reinforcing tendons are streched by jacks whilst keeping them inserted in voids left pre hand during curing of concrete

Post tensioning

Using pre stressed concrete has high span-depth ratio.

True

Using pre stressed concrete has more dead load.

False

Using pre stressed concrete is more economical

True

This is a single wire made out of steel

Wires

This is 2, 3 or 7 wires wound to each other to form a pre stressing strand.

Strands

This a group of of strands or wires

Tendons

A group of tendons

Cables

A group of cable that can be made up of single steel.

Bar

A pre stressed device where it utilizes high strength steel wires grouped into cables to a helical spring inserted into a duct.

Freysinnet System

A pre stressed device that employs a single wire system stressed Independently using double acting jacks.

Glifford Udal System

2 types of anchorage used in Gifford Udal System.

1. Tube Anchorage

2. Plate Anchorage

A pre stressed device that is utilized for pre stressing steel bars ranging from 12-28mm diameter. Used in smaller projects.

Lee McCall System

A pre stressed concrete device that is introduced by prof. Magnel from belgium that stresses 2 wires @ a time.

Magnel Blaton System

This is also similar to Freysinnet system

Magnel Blaton System

These are concrete elements, cast and cured in a manufacturing plant, then transported to the construction site.

Plant-Cast Precast concrete

This type of concrete is similar to pre fabricated concrete.

Plant-Cast Precast Concrete

These are precast concrete used for floor and roof decks

Precast Concrete Slabs

These are precast concrete that provides supports for slabs, projecting reinforcing bars will bond with concrete cast on site.

Precast concrete beams and girders

What is the most famous precast concrete beam?

Inverted Tee

A precast concrete that is long, slender and prestressed to provide resistance.

Precast concrete columns and wall panels

How to join precast column - column connection?

Metal bearing plates

How to join precast beam-column connection?

Bearing pads on the corbels

How to connect precast slab-beam connection?

Reinforcement, into the slab