Analysis of several steel deck types used for shallow-depth floors system（2） 

After we have selected the corresponding steel deck types, we can consider how to design steel deck slab. There are still many problems that we need to consider.

Design of steel deck slab

Design of steel deck slab has a number of considerations, it includes the thickness of the floor slab finalized according to the functional needs, the span between the steel beams, whether to consider the fire-resistant features, etc.

The thickness of the floor slab

Based on the shallow-depth floors system, the thickness of the floor should not exceed 120 mm, or even 80 mm. To determine the thickness of the floor, you can choose the type and thickness of the steel deck, determine the span of the steel beam, and determine whether to use steel floor decking or steel form decking, how to take fire-resistant measures.

And the decision on floor thickness depends on the function of the building, on the magnitude of the floor loads as well as on the height of the storeys and the height of the M&E floors.

Span of steel girder

When the thickness of the floor slab and the floor load is determined, you can come to design the span of the steel beams, the span of the steel beams directly affects the safety of the floor and the building, but also the thickness of the steel deck, etc., but also affects the budget of the shallow-depth floor system. The span of steel beams is calculated based on the above factors, but of course, there may be more factors involved.

Steel floor decking or steel form decking

The steel deck types can be selected according to the type of force, and it is a problem to choose Steel floor decking or steel form decking. In Solideck’s product library, you can choose, and when the choice is made, different designs will be carried out. When designing according to steel form decking, we should reconsider the force of the plate and need to increase the force reinforcement.

Fire resistant of steel deck slab

Even in the shallow-depth floor system the fire resistance of the floor slabs is important as it relates to human safety. The first thing to look at is the fire resistance class of the floor slab and the fire resistance period, according to which the fire resistance measures are determined. For example, when the fire resistance time limit is only 60 min, the trapezoidal steel deck needs to be covered with 70 mm on the top of the ribs, then if SD 38-914 is chosen, the thickness of the floor slab needs to be 110 mm, and if the original thickness can’t be satisfied, then the surface of the steel deck needs to be sprayed with fireproof coating.

The above are some issues considered by the Design of steel deck slab in the shallow-depth floors system, which need to draw the attention of our structural designers.