☆ Summary

We will focus on introducing users to the history, purpose, and selection of floor metal decks in this article, in this way,users can understand how to choose floor decking sheets for their project.

☆ History of metal deck

Metal deck already had a long history around 100 years,it was first used to support a concrete floor in 1920s.In early development,steel deck offered all the structural resistance and concrete was added to make sure walking surface and fire resistance.This development attracted many constructors,as it can serve as permanent formwork and construction platform.

In 1950s,a trapezoidal deck section with cold drawn wires welded across the deck ribs was developed.This product was found to be in good correspondence between predicted and high strengths.

In 1960s,trapezoidal steel deck with indentations rolled and profiled to achieve horizontal shear transfer between the concrete and steel. And a number of manufacturers were producing composite steel decks since mid of 1960s.

All these happened in European and American countries,China's earliest processing of floor plates began in the late 1970's and early 1980's. The company's name was China Metallurgical, formerly the General Metallurgical Construction Institute.And the equipments were imported from Japan,in order to build Bao steel,the most famous steel brand in China.

After 1980s, some domestic high-rise steel structure buildings began to use steel deck, so some new floor slabs were gradually born, and new products were also created from generation to generation.

☆ Iteration of metal deck in China

First generation products

We call this opened type floor steel decking,because these types have a opened mouth on the bottom part.During the process of installation and use, opened type floor decking is usually considered as a permanent formwork. The outside will be covered with reinforced concrete and it will need to be coated with fireproof materials,in order to improve the fireproof resistance performance.Throughout the 1990s, most steel high-rise buildings were dominated by opened type floor decking.

Second generation products

The bottom part is profiled together,so we call it closed type floor decking sheets.This type was earliest introduced by Taiwanese experts from the United States was called “ gencore ”, and the style name was YXB51-155-620.Its main advantage are as follows:

★ It can reduce the thickness of the floor slab, and has the function of suspension;

★ It can be used as part of the combined floor slab.

★ It is more suitable for steel structure buildings with small secondary beam spacing or some workshops that require suspension.

From 2000 to 2006,these types were highly chosen by many constructors.

Third generation products

Reinforced truss floor decking sheet is a kind of unsupported profiled composite floor slab.Reinforced truss floor steel deck is a composite floor slab in which the steel bars in the steel sheet are processed into reinforced trusses by imported equipment in the factory.Also the reinforced truss and galvanized sheet are welded into one in the factory. In the construction phase, the steel girder can bear the construction load, and it can be directly placed on the beam, and then the concrete can be poured by simple rebar engineering. Since the formwork function is completely replaced, the erection and disassembly work of the formwork is reduced, and the floor construction efficiency is greatly improved.

This steel deck is the most fashion style in high rise steel buildings until now.

☆ How to choose metal deck?

Utilization

No matter which type, the higher the utilization rate, the lower the overall cost. The wider effective width,then the utilization rate will be higher,but also need to consider one factor on width of steel coils,which was used to make it.The wider steel coil,the cost will be higher,too.

For example:

Aesthetics

After the construction of the closed-type floor slab is completed, the bottom of the plate is flat and the webs fit, with a gap of about 3-5mm. If the ceiling is not used, it can be directly spray-painted to make a ceiling with a shape similar to an aluminum gusset. ).Or you can also choose to paint with water-based paint after putting on putty to make a flat ceiling.

Floor thickness

For example, if your floor slab cement is 100 mm, then the height of the floor slab type should be 100-50 = 50 mm, which is meaning that you need to choose a floor slab that is with 50 rib height.

Irregular floor

For round,elliptical and other special-shaped steel structures,the steel deck are usually designed as two-way slabs.To use reinforced steel bar truss deck can solve the support problem of floor construction in irregular shape structures well.

If you are still confused about the selection,don’t worry,Yumisteel team is always here to support your work.