How to arrange rebars on steel decks

How to arrange rebars on steel decks , a question that is often asked, is expounded today on the arrangement of rebars on two forms of steel decks.

Rebar arrangement for steel form deck

For non-composite floor slab, steel deck mainly acts as a formwork, so the main force bearing is the positive moment rebar, so when calculating, it is calculated in the same way as the ordinary concrete floor slab, because the rebar is arranged on steel form deck In the ribs, attention should be paid to the spacing of the ribs of steel form  deck, and the stressed rebars should be arranged according to the spacing of the ribs.

Rebar arrangement for composite floor deck

 For composite floor slab, steel deck not only acts as a formwork, but also can replace the stressed steel bars at the bottom of the slab, so it is not necessary to configure additional stressed rebars according to the load and span conditions. The reinforcement calculation of Composite Floor Deck in the normal use stage is mainly to convert the amount of steel used in Composite Floor Deck into the amount of rebars, and calculate whether it meets the bending resistance requirements. On the other hand, in the event of a fire, only consider whether the amount of steel used in the effectively used part of Composite Floor Decks meets the bending resistance requirements during a fire. If all of them can be satisfied, there is no need to configure steel bars. If it is only satisfied in the use phase but not in the fire phase, fire-resistant steel bars need to be configured.

Whether it is the upper reinforcement or the lower reinforcement, the thickness of the protective layer of the floor slab must be considered, and the lower reinforcement is especially not allowed to be placed directly on steel decks.