Selecting a composite floor deck profile is not simply a matter of choosing the one with the greatest span or load capacity in a table. The solution must be checked during the construction stage, the composite stage and under fire conditions, as different factors may govern each stage. This article summarizes that approach and links the selection criteria to the worked examples in the guide.<\/p>\n
Three main structural factors act simultaneously in a composite floor deck:<\/p>\n
Although all three factors must be checked, they do not necessarily have the same influence. Different factors may govern the construction stage, the composite stage and the fire resistance assessment within the same project. Identifying which checks govern each solution helps guide profile selection and avoid unnecessary oversizing.<\/p>\n
In projects requiring large open spaces, such as open-plan offices, retail areas or multipurpose buildings, the distance between supports may govern the design. The aim is to achieve longer structural spans, even if temporary propping is required during construction.<\/p>\n
In these cases, the construction stage is particularly important. Deflection criteria (L\/180 and the absolute limit) may govern the design before the ultimate limit states do.<\/p>\n
Choosing a profile with greater strength and stiffness during the construction stage may allow you to:<\/p>\n
Examples in the guide:<\/p>\n
In industrial buildings, technical areas or car parks subject to high imposed loads, load may govern the design.<\/p>\n
In this scenario:<\/p>\n
The design can be optimised by selecting a profile whose geometry can resist higher forces while minimising any increase in slab depth and additional steel.<\/p>\n
Example in the guide:<\/p>\n