Norwegian Steel Day 2015 CoSFB, Composite Slim-Floor Beam Integrated Floor Beam Solution with Resistance to Fire Oslo, 11/2015 Matthias Braun mathias.braun@arcelormittal.com
Slim-Floor Construction < 1930 Norwegian Steel Day 2015 2
Slim-Floor Construction Request of modern architecture: Transparent structural envelopes with column free ground floor design Flexibility for sustainable conversion of use Possibility to upgrade services for multifunctional living Slim-floor construction (IFB / SFB): Combines advantages of prefabricated slab elements with steel-framed construction Economic solution fulfilling the above specified demands Norwegian Steel Day 2015 3
Slim-Floor Construction - Advantages Slim-Floor construction is characterized by the integration of a steel section into the slab. No impact of the service integration on the construction Structure can easily be adapted to future use Norwegian Steel Day 2015 4
Slim-Floor Construction - Advantages Slim-Floor construction is characterized by the integration of a steel section into the slab. Integrated fire resistance -> up to R90 possible w/o fire protection!) Norwegian Steel Day 2015 5
Slim-Floor Construction Composite Design Because of a limited construction height, the inertia and the bending stiffness of integrated floor beam is limited! The design is mostly driven by the SLS (deflection + vibration) Typical beam spans are limited to +/- 7m How to achieve longer spans? Composite Slim-Floor Beam - CoSFB D c h CoSFB Key Advantages: Clear beam spans up to 14m by keeping an overall construction height of 40cm! b eff Integrated Fire Resistance up to class R90 (R120)! Concrete Dowel Norwegian Steel Day 2015 6
Slim-Floor Construction Composite Design non-composite SFB composite SFB composite SFB h b m 3097.5 mm h CoSFB-Betondübel = Deep-embedded concrete dowel b m 3097.5 mm Norwegian Steel Day 2015 7
2.9m CoSFB Advantages of Composite Design ULS: 1.35 x g k + 1.50 x q k HE320B + 500x25, S355 L CoSFB SLS: 1.00 x g k + 0.20 x q k Beam type ULS Bending Moment SLS Natural Frequency Max. Span SFB (non-composite) M pl,rd = 890kNm I y 52000cm 4 CoSFB (C30/37, b eff = 2.75m) M pl,rd = 2000kNm I y,0 140000cm 4 Dowel reinf.: 8 12 per meter M Ed / M pl,rd = 0.99 < 1.00 M Ed / M pl,rd = 0.82 < 1.00 F = 3.6Hz > 3.0Hz L max = 8.10m F = 3.0Hz > 3.0Hz L max = 11.00m Norwegian Steel Day 2015 8
Slim-Floor Construction Composite Design non-composite SFB composite SFB composite SFB h b m 3097.5 mm h CoSFB-Betondübel = Deep-embedded concrete dowel b m 3097.5 mm Norwegian Steel Day 2015 9
CoSFB Technical Approval http://sections.arcelormittal.com/library/articles-publications/slim-floors-ifb-sfb-cosfb.html Norwegian Steel Day 2015 10
CoSFB Technical Approval Resistance P Rk of Concrete Dowel ( CoSFB Betondübel ): Concrete class / Web thickness C25/30 C30/37 C35/45 C40/50 to C55/67 7,5mm t w < 15,5mm 117 125 135 122 15,5mm t w 148 157 166 122 P Rk values in kn, Safety factor g v = 1.25 Norwegian Steel Day 2015 11
Composite Slim-Floor Beam - CoSFB CoSFB-Betondübel = reinforced concrete dowel, new method to assure a composite action Fits perfectly to slim-floor construction (= integrated beams) Allows for significant increase of the beam span (up to 14m) Norwegian Steel Day 2015 12
Slim-Floor Construction Slab Systems Hollow Core Slab Modern, Partially Prefabricated Slabs Asport Wickrange, LU (Astron) La Petrusse, LU (ArcelorMittal) Norwegian Steel Day 2015 13
Composite Slim-Floor Beam Slab Systems CoSFB + Cofraplus 220 CoSFB + Cofradal 260 Generally CoSFB can be combined with various slab types: Cofraplus 220, Cofradal 200, Cofradal 260 and partially prefabricated concrete slabs. Slabs with low self weight should be preferably used. Application range of CoSFB: Beam span from 6m up to 12m (14m) Beam distance from 5m up to 10m Floor Solution for offices, hotels, storages, mezzanines in industrial build. Norwegian Steel Day 2015 14
h Slim-Floor Construction - Column Grid Use of the floor Live Load (additional Dead Load) Choose an adequate slab -> h slab Maximum beam distance Maximum beam span? CoSFB: L CoSFB h x 35 SFB: L SFB h x 25 L CoSFB Beam Span L [m] Norwegian Steel Day 2015 15
Slim Floor Construction Fire Resistance CoSFB with integrated Fire Resistance R90 R90 Norwegian Steel Day 2015 16
Slim Floor Construction Fire Resistance Isothermes at 60min. (= 3600 Seconds) Norwegian Steel Day 2015 17
Slim Floor Construction Fire Resistance Isothermes at 90min. (= 5400 Seconds) Norwegian Steel Day 2015 18
Slim Floor Construction - Sustainability Norwegian Steel Day 2015 19
32cm L = 8.1m Slim Floor Construction - Sustainability LCA Comparison study: Grid 8.10m x 8.10m CoSFB + Cofradal 260 versus Flat Concrete Slab (27 + 5cm) CoSFB Cofradal 260 a = 8.1m Concrete: C30/37 DL C260: 2.80 kn/m 2 add. DL: 1.70 kn/m 2 LL (cat.b): 2.50 kn/m 2 Part. walls: 1.00 kn/m 2 REI 60 Concrete: C30/37 DL : 6.75 kn/m 2 add. DL: 1.70 kn/m 2 LL (cat. B): 2.50 kn/m 2 Part. walls: 1.00 kn/m 2 REI 60 CoSFB: HE220B + Plate 400x20, S355M In-situ flat concrete Slab: Cofradal 260 Norwegian Steel Day 2015 20
Slim Floor Construction - Sustainability LCA Comparison study: Grid 8.10m x 8.10m CoSFB + Cofradal 260 versus Flat Concrete Slab (27 + 5cm) Total volume of concrete: 7.55 m 3 Total mass of concrete: 18.3 to Total mass of reinforcement: 1.11 to Total mass of C260 metal deck: 0.79 to Total mass of CoSFB section: 1.09 to (Weight of CoSFB per sqm 16.6 kg/m 2 ) Total volume of concrete: 21.0 m 3 Total mass of concrete: 50.8 to Total mass of reinforcement: 2.85 to (Reinforcement ratio 41.5 kg/m 2 ) Norwegian Steel Day 2015 21
Validated by: Norwegian Steel Day 2015 22
Slim Floor Construction - Sustainability LCA Comparison study: Grid 8.10m x 8.10m LIFE CYCLE ASSESSMENT Synthesis (AMEco software) CoSFB + Cofradal 260 Flat Concrete Slab (27 + 5cm) Impact GWP PEC* GWP PEC* of [to CO 2 -eq.] [GJ] [to CO 2 -eq.] [GJ] Production 6.99 64.46 10.04 83.82 Transport 0.17 3.26 0.26 4.84 End of Life - 0.77-1.53 1.18 21.64 Total 6.38 66.19 11.49 110.3 * PEC: only non-renewable energy mix has been taken into account Norwegian Steel Day 2015 23
Slim Floor Construction - Sustainability Life Cycle Assessment - Synthesis [%] 100 100 100 56 60 40 Mass Global Warming Potential Primary Energy Consumption Norwegian Steel Day 2015 24
Slim Floor Construction Application Examples Office Building - Luxembourg Norwegian Steel Day 2015 25
Slim Floor Construction Application Examples Collège de Gignac, F Plein ciel - St. Nazaire, F Hoche - Nimes, F AM Office - Metz, F Grand Théâtre - Saumur, F Musée Maritime La Rochelle, F Norwegian Steel Day 2015 26
Composite Slim-Floor Beam - CoSFB CoSFB is perfectly closing the gap between non-composite slim-floor construction and cellular beams Slab Span Slim-Floor Beam (noncomposite) CoSFB (Composite Sim-Floor Beam) Std. Beams ACB Angelina 6m 12m 14m Beam Span Norwegian Steel Day 2015 27
Composite Slim-Floor Beam - Publications http://sections.arcelormittal.com/functions/home.html Norwegian Steel Day 2015 28
CoSFB Engineering Award 2015 is awarded by the German Steel Construction Industry for the development of the CoSFB-Betondübel! Munich, Germany 2015 Norwegian Steel Day 2015 29
Thank you for your attention! QUESTIONS? Norwegian Steel Day 2015 30