Strucdek 75, the state-of-the art profile in steel floor decking that engineered to provide excellent performance in spanning capabilities, acoustic, fire protection and concrete consumption for both steel and concrete framing construction.
Spanning Capacities and Composite Strength
Thanks to its innovative design, Strucdek 75 offers greater spanning capacities than similar decks in positive bending and end shear due to the high ribs which resist lateral deflection. Strucdek 75 also offers stronger composite strength due to its high ribs which develops a strong mechanical interlocking with concrete slab.
Table Strucdek 75 Maximum Un-propped Span with Fire Rate 2 Hours
- The calculation based on EC4 (Eurocode 4)
- The load factor is 135 for superimposed dead load
- The load factor is 15 for imposed load
- Construction load based on Eurocode is 15 kN/m3
- Imposed load maximum up to 5 kN/m2
- Superimposed dead load is 15 kN/m2
Specification and Design of Strucdek 75
Strucdek 75 is manufactered from high tensile steel (min 500 mpa yield stress) with a base metal thickness (BMT) of 0.75mm, 1.00mm or 1.20mm. The galvanized coating is Z 275 (min 275g/m2) in accordance with EC4. Other base metal thickness and coating classes are also available on request, subjected to availability.
Table 1 Strucdek 75 Material and Section Properties
+ A zinc coating of total 275g/ (Including both sides) is sufficient for internal floors in a non-aggressive environment, but the specification may be varied depending on service conditions - EN1994-1-1 4.2(3).
Fire Resistance Design
Fire resistance for Strucdek 75 composite slab is designed in accordance to EN 1994 -1-2 (Eurocode 4). As per result from finite element analysis in order to ensure that slab still can take load after two (2) hours fire rate, wire mesh or rebar must be provide at minimum 30mm from the concrete surface only for continues span, however the area of wire mesh based on the result of calculation done by competent Engineer which based on superimposed dead load and imposed load, however for single span wire mesh must be provide at minimum thirty (30) mm from top of concrete surface add with bottom reinforcement (usually rebar) at minimum thirty (30) mm from decking pan.
A 3D finite element model has been conducted and by using transient heat transfer analysis method and based on fire protocol curve given by EN 1994 – 1 - 2 (Eurocode 4), our 3D model result can firmly represent the real situation, which will ensure that Strucdek 75 can sustain the slab even after two hours fire exerted at place.
Openings on Strucdek 75
For openings (drilling holes) is inevitable on construction, however openings (drilling holes), have certain criteria which must be followed:
- For openings (drilled holes) less than 100 mm up to 300 mm in square shape or circle shape, there is no need any additional reinforcement to be provided, since the effect to she stiffness of the slab is too small.
- For penetration (drilled holes) more than 300 and maximum up to 700 mm in square or circle shape, we must design transfer strip beam (additional reinforcements are needed).
- For openings (drilled holes) more than 700 mm in square or circle shape, we must provide supporting beam around the opening.
Before proceed with decking (decking concrete slab) installation, there some prerequisite conditions which are listed below:
- All sub-structure works have been done.
- Columns and beam have been erected, adjusted, bolt and nuts have been tightened properly.
- All equipment and material have been place nearly to area.
Put all deck on top of beam, arrange the Strucdek 75 properly and connected it by clipping them properly (male to female) as shown on sketch below and the lane position of the layer must follow the construction drawing.
Tightened Strucdek 75 to Beam
Since the Strucdek 75 have layered and tie together, we must make sure the level in flat, and we check it by using water level to make the surface of deck is flat, we continue by welding the edge of Strucdek 75 (min 50 mm) using self drilling screw (fastener) or tack-welded with spacing every 150 mm. Quality of welding must be check visually by inspector and approved by engineers.
Minimum edge distances for shot-fired fasteners on steel and concrete supports.
End Bearing Requirements
Shear connectors and reinforcement installation
If all the edges of Strucdek 75 have welded properly, we continue by installing the shear connectors, diameter 19 mm, Installed the shear connector to the steel beam using special welding equipment base on AWS D1.1 ( stud gun ), however make sure the electric current min 1750 amperes, the spacing of shear connector is 200 mm, every beam will have shear connectors, this is shown on construction drawings, after the shear connectors have been installed properly we must check the welding quality, whether it comply with our specification by using visual inspection follow by site bending test ( mentioned on check list ). and approved by engineer. Install the top wire mesh and bottom reinforcement as per indicated in the shop drawings.
Shear Stud diameter 19 mm
Installation of edge form and their accessories
Now there are two stages left to finish the work, since all decking have been installed and checked properly we can proceed by installing the edge form, bonfill and ceiling suspension as per M&E drawings and tight them properly, we can inspect and do visual check to make sure everything have been install and tight properly. Before pouring slab, we do site cleaning to make sure all dust and debris have been move from pouring area by using air compressor. Flush the surface of decking and all the reinforcement on the slab with water and start pouring the slab.
Typical Strucdek 75 Installation
Typical Side Encased Beam
Typical End Encased Beam
Typical Inside of Wall Detail
Typical Wall Side Detail
Typical Wall End Detail
Typical Edge With Plate
Typical Side Detail
Side Cantilever With Stub Bracket
Step In Floor
Typical End Detail
Plan View of Typical Floor Layout
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