Construction Technology IIISteel Framing System

[ Cold-Form Structures + Composite Floor Slab ]

Tan Shen Sin ( 0324602 )Thasia (0329051 )

Wong Sher Sheng ( 0329950 )

Cold-formed Structure

● "Skeleton Frame" of

vertical steel columns and

horizontal I-beams

● Provides excellent design

flexibility due to the high

strength to weight ratio of

steel

● Used in high rise building,

industrial building, residential

building and temporary structures.

● Components include steel beams

and columns, portal frames and

roof trusses

How cold-form steel is manufactured ?

1. Cold-formed steel starts with the production

of raw steel, which is made by combining iron

ore or steel scrap with small amounts of

carbon in a Basic Oxygen Furnace (BOF) or

Electric Arc Furnace (EAF)

1. Molten steel is poured into slabs that are

reduced into thinner strips of steel, called “hot

band.”

3. In the steel finishing process, the hot band is

reduced once again into “cold rolled steel.” A

protective coating of zinc is then added through

the galvanization process. The final product is

called a “coil.”

4. To convert coils into cold-formed steel framing

members, they are first slit into widths that match

the intended dimensions of the final product.

5. The slit coils of cold-formed steel are formed

into C-sections and other shapes usually by roll

forming the steel through a series of dies. No heat

is required to form the shape. A variety of steel

thickness is available to meet a wide range of

structural and non-structural applications.

6. The cold-formed steel framing materials are

then either used to build wall and floor panels,

and roof trusses, or delivered to the job site in

bundles.

Advantages of cold form structures

High Strength Durable Non-combustible

Sustainable Cost-effective Light Weight

- Provides greater

flexibility, allowing

difficult design.

- Protective layer of zinc

provide hundred years of

durability

- Can be easily design to

meet code fire rating

requirements

- The only material that is

infinitely recyclable.

- Lower insurance cost for

builders and owners

- Easy to transport and erect

Disadvantages of cold form structure

Low fire resistance

Careful requirements

when assembling

Difficult connecting

Require thermal &

sound insulation

Composite Floor Slab

Advantages of composite slab

Versatility

Resistance/weight ratio

Quick Installation

Cost reduction

Safe

Strength

Easy on site handling

Can be adapted to many practical cases and a multitude

solutions

Greater resistance with less weight

Concreting can be done in more than one floor

Less concrete is used

Easy cleaning and stock-piling

Lighter and stronger than most conventional slab.

Transported to site in pre cut lengths, and in pre-packaged

bundle.

Disadvantages of composite floor slab

1. Composite are more brittle than metal

2. Most of the slab will crack

3. Temperature sensitive

4. Might cause overloading

5. Damaged or faded material must be replaced

Case Study

● A seven story hotel built by Brackett Builders of Troy, Ohio.

● Project Completed in 2009.

● General contractor has estimated cost savings of $10/square feet.

Embassy Suites ,Columbus, OH

Project Owner : Airport Core Hotel, David Patel

Project Architect : Bird Houk Collaboration

Project Engineer : Jezerinac Geers

General Contractor : Brackett Builders

Steel Framing Manufacturer : Worthington Mid-Rise

Construction

● CFS framing was used for interior and

exterior load-bearing and non load-bearing

walls, and floor and roof joists.

● Largest cold-formed steel (CFS) load-bearing framing project in California

● Project completed 6 months sooner than original schedule.

● a LEED ( Leadership in Energy & Environment Design) Gold project

Poly Canyon Village Student Housing

Project Owner : California Polytechnic State University

Project Architect : Ed Palmer, Niles Bolton Architects

Steel Framing Installer : KHS&S

● Comprised of nine buildings, each with a 4 or 5 story CFS structure on a

slab foundation.

● Floor framing was accomplished with CFS floor joists with 9/16 inch of

shallow metal decking

● Roof framing consisted of steel trusses

Thank You