Calculator - Fibre-Reinforced Concrete Floor Design

Fibre-reinforced concrete floor design calculator | KOREFIB® G40

KOREFIB® — INDICATIVE MACRO-FIBRE DOSAGE ESTIMATE

Calculator — fibre-reinforced concrete floor design with KOREFIB^® G40

A preliminary indicative estimate of the macro-fibre dosage for industrial fibre-reinforced concrete floors according to the TR 34 methodology (4th edition) — bending by the yield-line method (Meyerhof) and punching to EN 1992. KOREFIB^® G40 material data from TZÚS testing (EN 14651), valid for a dosage of 4–8 kg/m³. Hover over i for notes.

Input

Build-up

Structure type iGround-supported slab = new slab on a compacted subgrade, calculated to TR 34. New layer on an existing concrete slab = screed / overlay; TR 34 does not apply here, the system capacity is carried by the existing slab and only punching through the new layer is assessed.

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Floor geometry

Floor area iTotal floor area for which the fibre supply is calculated. Used to compute the total consumption (kg). It does not affect the capacity — that is calculated for the local load. total to supply

m²

Slab thickness iSlab thickness h. For industrial fibre floors going below 120–150 mm is not recommended. Capacity increases with h². h

Subgrade

Subgrade type iModulus of subgrade reaction k (Winkler). Select a type — the value is filled in. For an accurate design use k from a geotechnical survey.

Modulus of subgrade reaction iSubstrate stiffness (Winkler model). Higher k = stiffer, more load-bearing substrate. Filled in automatically from the subgrade type above, or enter your own from a geotechnical survey. k

N/mm³

Concrete

Strength class iConcrete strength class (e.g. C25/30). A higher class = stronger concrete, higher capacity. For industrial floors C25/30 and higher is usually used.

Modulus of elasticity iConcrete modulus of elasticity E_cm. Filled in automatically from the selected concrete class. Affects slab stiffness and load distribution. Change only if you have an accurate value. E_cm (auto)

MPa

Concrete safety factor iPartial safety factor for concrete γ_c (usually 1.5 per EN 1992). Reduces the design concrete strength to the safe side. Do not change without reason. γ_c

Load position

Where the load acts iActual position of the rack leg / wheel relative to the slab. Capacity is highest in the interior and lowest at a corner (TR 34 eq. 21–26). For doors and columns choose the corner conservatively.

Load transfer across joint iTR 34: no more than 50 % can be transferred across a joint. Aggregate interlock ≈ 15 %, dowels 30–50 %. Without verification choose 0 %. only for “at a sawn joint”

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Load

Load character iStatic = permanently standing (rack, machine). Dynamic = moving equipment (forklift), for which a dynamic factor additionally applies.

Load type iEach type = one separate load case, not added together. Per TR 34 the most unfavourable case governs. The factor γ_F is set automatically.

Load per leg iCharacteristic vertical force on one foot / wheel. Converted to the design value by the factor γ_F. rack leg, char.

Foot dimension iContact area dimension (square). TR 34: for pallet racking without detail 100×100 mm. Equivalent radius a = √(x·y/π). square x = y

Recommended minimum

– kg/m³

Selected dosage · consumption

– kg/m³

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Selected dosage iKOREFIB G40 dosage to assess (e.g. from a quotation). The indicators and capacity below are recalculated. Range 4–8 kg/m³ (TZÚS testing).

kg/m³

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Utilisation — selected position

Check	Load P_d	Capacity	Reserve

Input values

Calculation detail (TR 34)

Technical notes

Capacity is not the only criterion. Floors more often fail by cracking, corner curling and shrinkage — these states are not assessed by the calculator.
Cut joints in time and keep the panel spacing and aspect ratio (TR 34: aspect ratio max 1.5:1, spacing typically up to 6 m).
Ensure a uniformly compacted subgrade with a verified modulus of reaction — a non-uniform substrate is a common cause of cracking.
Do not place heavy point loads near corners, edges and joints without an individual assessment.
KOREFIB G40 material data are based on TZÚS testing (EN 14651) and are valid for a dosage of 4–8 kg/m³; outside this range the calculator does not compute (values are not extrapolated).

Disclaimer. An indicative preliminary dosage estimate to the TR 34 methodology (4th edition) and EN 1992. It does not replace structural design, design documentation or assessment by a chartered engineer. KOREFIB G40 data from TZÚS testing (EN 14651), valid for 4–8 kg/m³; interpolated between tested dosages, not extrapolated beyond the range. The final design must be assessed by a structural engineer taking the specific site conditions into account.

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Calculator - Fibre-Reinforced Concrete Floor Design

Calculator — fibre-reinforced concrete floor design with KOREFIB® G40

Input

Technical notes

Calculator — fibre-reinforced concrete floor design with KOREFIB^® G40