What are the most frequent types of flooring systems utilised in multi-story steel structures? The advantages and factors addressed when specifying a floor system for a given structure are discussed for various types of floor systems utilised in the construction of multi-story steel structures with span ranges. The Different Types of Floor Systems Used in Multi-Storey Steel Structure Construction The following are examples of steel structure floor systems: Composite beams and slabs with aluminium decking for short spans Slim dek is a type of floor covering. Steel decking with cellular composite beams and composite slabs Precast concrete units with Slimflor beams Composite beams and slabs with aluminium decking for long spans Precast concrete units with composite beams Precast concrete units with non-composite beams.
Beams and Composite Slabs with Metal Decking
shows the components of such a system, which include a steel beam with shear studs attached to its top flange, which form a composite action between the beam and the composite slab. System for a Composite Floor shows a composite floor system. The slab is made out of steel profiles that are poured in place. Steel deck profiles come in a variety of shapes and sizes, with spans ranging from 3 to 4 metres. Various Steel Deck Profiles Different Steel Deck Profiles Furthermore, both primary and secondary beams are composite members, whereas edge beams may be non-composite. Beams range in thickness from 0.9 to 1.2 metres, with a slab thickness of 130 millimetres and a steel deck depth of roughly 60 millimetres.
Primary beam spans range from 6 to 9 metres, while secondary beam spans range from 6 to 7.5 metres. It should be noted that services and utilities are run beneath the slab, which has an impact on the slab’s overall thickness. Because edge beams are often deeper than interior beams, the thickness of the floor system is governed by edge beams. When compared to non-composite floor systems, this floor system is cost effective, light weight, and requires thinner beams. In terms of composite floor disadvantages, beams require fire protection, a significant number of columns are required, and the floor thickness is more than with other systems.
Floor System Slimdek
shows the slimdek floor systems in detail. It is made out of asymmetric steel beams that support a 225mm thick slab. The overall thickness of the floor ranges from 500mm to 1200mm. Slimdek floor systems have a span of 6.5m to 7.5m. One of the most notable features of the slimdek floor system is that it gives a nearly levelled soffit, which simplifies utility installation, and the floor thickness is less than other systems. As a result, the structure’s overall height can be reduced. There are some drawbacks to using a slimdek floor system. Because of the variation in flange width between the top and bottom, for example, unique connection details would be required. Steel floors are typically heavier than other types of floors.
Cellular Composite Beams with Steel Decking and Composite Slabs It is made out of cellular beams that support a composite slab with a steel deck profile and concrete on top. The beams’ spans range from 10 to 18 metres, with openings spaced at regular intervals. Although circular holes are the most common, different shapes are possible. Openings in high shear areas, such as those adjacent to supports, should be avoided.Various Opening Shapes in Beams Beams with a Variety of Openings For a span of 15m and a 400mm opening, the overall thickness of such a floor system is roughly 1200mm. Secondary beams are typically spaced 3-4 metres apart.The benefits of this floor system include the supply of a vast clean area without the need of any additional materials.
Precast Concrete Units with Slimflor Beams
Slimflor is made up of a slim beam and a precast concrete slab that sits on top of it, with reinforced concrete utilised to connect the components. This sort of floor system can use both composite and non-composite beams. The thin beam is made by welding a 15mm thick plate to the underside of the beam section and extending 100mm beyond the bottom flange on both sides.Precast Concrete Units with Slimflor Beams Slimflor Beam The beams’ depth is limited to the depth of the floor, and their span spans from 4.5m to 7.5m, with the occasional exception of 10m. Shallow beam deflection, on the other hand, should be addressed in the code.
The entire floor thickness for small and big services is 600mm and 1000mm, respectively. There is no requirement for beam fire protection for 60 minutes, the tiny floor thickness allows for a reduction in overall structure height, and shear studs can be welded off-site, reducing on-site activities. Heavy steel work, additional fabrication, great connection details, and more effort required to supply and install precast slabs when compared to composite slabs are all disadvantages. Primary and secondary steel beams, as well as a composite slab, make up the structure. For this floor system, there are two major beam combinations. Long span beams with a spacing of 3 to 4m operate as secondary beams to support the slab. Short span primary beams support these secondary beams.Alternatively, the slab might be used.
Composite Beams with Precast Concrete Units
The slab can also be supported by short span secondary beams, which are in turn supported by large span primary beams. Long beams have a span of 10 to 15 metres, and their spacing is 6-9 metres when used as a primary beam and 3-4 metres when used as a secondary beam. The overall thickness is determined by the span used, for example, 1000mm for a 13.5m span and 1200mm for a 15m span. The most notable benefit is the availability of a huge clearance area without the use of columns. Nonetheless, when compared to short span floor systems, the floor thickness is greater, fire protection is necessary, and heavy steel construction is required.
This floor system is made up of hollow or solid precast concrete units that are put on steel beams that have shear studs soldered to them. The concrete precast units are 150-160mm thick for hollow units and 75-100mm thick for solid units. As shown in, reinforced concrete toppings are installed on the beams to link units. A sufficient flange is required to offer ample seating for the precast components. Construction of a Composite Beam Using Precast Materials shows a composite beam made of precast concrete. Both beams and precast concrete sections have a span of 6 to 9 metres, and the overall floor thickness is roughly 900 millimetres. Because of the huge number of secondary beams required, this floor system has a variety of advantages over other systems.
Precast Unit Construction Composite Beams
The possibility of lateral tensional buckling of beams, the necessity for careful detailing to surround precast concrete units, and the increased labour required to transport, lift, and place precast concrete units are all disadvantages. To prevent lateral tensional buckling during construction, temporary lateral supports for beams are required. Precast Unit Construction Composite Beams Composite Beams with Precast Unit Construction Precast Concrete Units with Non-Composite Beams Precast concrete units are installed on steel beam flanges or shelves that are bolted or welded to the web of the beams. The shelves are utilised to reduce the floor system’s overall thickness. The overall thickness of the floor is roughly 800mm.
Hollow core and solid precast units can both be utilised in composite construction with the same thickness. Both beams and precast concrete units have a span of 6-7.5m. Slab of Hollow Precast Concrete Hollow Precast Concrete Slab After the precast concrete components have been set in their final position, grouting is applied. Non-composite beams with precast units have the advantage of requiring fewer secondary beams due to the lengthy precast concrete spans. The necessity for lateral interim support for beams to prevent lateral tensional buckling, the need for sequential precast concrete installation, and extra work for individual lifting and placing of precast units are all disadvantages.
One way slab on beams,One-way joist floor system.
Concrete floors are by far the most common option for steel building owners.
Structural floor systems are designed using a system of beams and joists.