The cement thickness of steel structure steel decks is typically 120mm, which is the same as the 120mm thickness commonly used in many concrete structures. However, in certain special projects, the steel deck thickness may be thicker, such as in two- or three-story factories where a large amount of equipment needs to be housed, resulting in a heavier floor load and potential vibration loads. In such cases, the steel deck thickness is usually 150mm, and sometimes even reaches 200mm.

Regarding vibration loads, Zhonggou New Materials will give you two small examples:

For example, in parking garage projects, vehicles generate corresponding vibration loads when starting or stopping, so the steel deck thickness needs to be correspondingly thicker.

For example, in a bar project where customers dance, Zhonggou New Materials would also consider the issue of vibration load.

In fact, the selection of the thickness of steel structure steel decking is influenced by many factors. Zhonggou New Materials will focus here on how the thickness of the steel decking is affected under a fire resistance rating of 1.5 hours.

Firstly, to achieve a fire resistance rating of 1.5 hours in steel structure steel decking, three main types can be selected: open-end decking, narrow-end decking, and closed-end decking. The specifications stipulate that the concrete should be 80mm above the top of the ribs in open-end decking, and bottom reinforcement bars must be provided at the bottom of the decking.

In addition, another method is to apply fire-retardant coating to the bottom of the open steel deck, with a coating thickness of 15mm or more. In this case, as long as the structural requirement is met, it is sufficient to be 5cm higher than the top of the rib.

For both narrow-mouth and closed-mouth decks, the total steel deck thickness only needs to be greater than or equal to 110mm. It's important to note that while narrow-mouth decks are better in terms of fire resistance than open-mouth decks, they still require bottom reinforcement bars, whereas closed-mouth decks do not.