Steelwork calculators.Steel fixing, bending schedules, laps, structural steel erection, bolting and lifting weights.

Bar weights and quantities

Bar weights and quantitiesRebar mass per metre and total weight (BS 4449 / BS 8666)

m = \frac{d^{2}}{162}

Bar weights and quantitiesNumber of bars at given centres across a width

L_{n} = 1000 L - 2 c

Bar weights and quantitiesBars per m² and steel weight per m² of a two-way mat

l_{x} = \frac{1000}{s_{x}}

Bending and shape codes

Bending and shape codesMinimum bend radius, mandrel and end projection by bar size (BS 8666)

r, M, P = BS 8666 Table 2 values for bar size d

Bending and shape codesBS 8666 cutting length by shape code (00, 11, 12, 13, 21, 25, 26, 31, 32, 33, 41, 51, 63)

L_{00} = A

Bending and shape codesLink (stirrup) cutting length from member size, shape 51 or 63

A = h - 2 c

Anchorage, laps and cover

Anchorage, laps and coverAnchorage and tension lap length (Eurocode 2 with UK NA)

f_{ctd} = \frac{α_{ct} \times 0.7 \times 0.3 {f_{ck}}^{2 / 3}}{γ_{c}}

Anchorage, laps and coverCover check to links and main bars (Eurocode 2 cnom = cmin + Δcdev)

c_{b,m} = φ + k

Mesh, spacers, chairs and tying

Mesh, spacers, chairs and tyingMesh sheets for an area, with end and side laps, and weight (BS 4483)

n_{a} = \max (1, ⌈ \frac{L - \frac{l_{e}}{1000}}{S_{L} - \frac{l_{e}}{1000}} ⌉)

Mesh, spacers, chairs and tyingSpacers or chairs for an area at given centres

n = \frac{10^{6}}{s_{x} s_{y}}

Mesh, spacers, chairs and tyingChair height for a top mat

H_{s} = h - c_{t} - d_{t1} - d_{t2}

Mesh, spacers, chairs and tyingTying wire for a mat of bars

n_{i} = \frac{10^{6}}{s_{x} s_{y}}

Schedules, cutting and pricing

Schedules, cutting and pricingBending schedule total tonnage by bar size

L_{t} = L_{6} + L_{8} + L_{10} + L_{12} + L_{16} + L_{20} + L_{25} + L_{32} + L_{40}

Schedules, cutting and pricingCutting from 12 m stock bars: pieces per bar, bars needed and waste

p = ⌊ \frac{1000 S}{L_{c}} ⌋

Schedules, cutting and pricingSteel fixing time and price from tonnage

F_{d} = \frac{T}{P}

Weights and lifting

Weights and liftingSteel member and schedule weight from section mass per metre

m = w \cdot L \cdot n \cdot (1 + \frac{f_{a}}{100})

Weights and liftingLift weight of a steel piece with rigging and hook block

m_{p} = w \cdot L \cdot (1 + \frac{f_{a}}{100})

Weights and liftingCrane radius from plan offsets and load chart utilisation

R = \sqrt{{d_{x}}^{2} + {d_{y}}^{2}}

Bolting

BoltingBolt tensile stress area from diameter and thread pitch (ISO 898-1)

d_{2} = d - 0.649519 p

BoltingNominal minimum preload Fp,C for preloaded bolts (BS EN 1090-2)

F_{p,C} = \frac{0.7 \cdot f_{ub} \cdot A_{s}}{1000}

BoltingTightening torque for preloaded bolts, torque method (BS EN 1090-2)

M_{r} = k_{m} \cdot d \cdot F_{p,C}

BoltingBolt assembly count and weight for a connection schedule

N = ⌈ n_{c} \cdot n_{b} \cdot (1 + \frac{s_{p}}{100}) ⌉

Column bases

Column basesHolding-down bolt projection above concrete

P = g + t_{p} + t_{w} + m_{n} + n_{t} \cdot p

Column basesNon-shrink grout volume and bags under base plates

V_{1} = \frac{(L_{p} + 2 e) \cdot (B_{p} + 2 e) \cdot g}{10^{6}}

Column basesPacking and shim stack under a base plate

H = (L_{top} - L_{c}) \times 1000 - t_{p}

Erection tolerances

Erection tolerancesColumn plumb check against the permitted deviation per storey

Δ_{p} = \max (\frac{h}{k}, Δ_{min})

Erection tolerancesBeam level check: each end against specified level and end to end

δ_{A} = (L_{A} - L_{s}) \times 1000

Erection tolerancesBeam camber check against NSSS tolerance (as amended by AD 465)

Δ = c_{m} - c_{s}

Erection tolerancesThermal movement of a steel frame from the erection temperature

Δ L_{+} = α \times 10^{- 6} \cdot L \times 1000 \cdot (T_{max} - T_{e})

Coatings and fire protection

Coatings and fire protectionI-section heated perimeter, area and section factor Hp/A

H_{p} = 2 h + (s - 2 X) b + (1 - X) ((2 π - 8) r - 2 t_{w})

Productivity and pricing

Productivity and pricingErection programme and price from pieces per day

D = ⌈ \frac{N}{r_{p}} ⌉

Steelwork calculators.Steel fixing, bending schedules, laps, structural steel erection, bolting and lifting weights.

Bar weights and quantities

Bending and shape codes

Anchorage, laps and cover

Mesh, spacers, chairs and tying

Schedules, cutting and pricing

Weights and lifting

Bolting

Column bases

Erection tolerances

Coatings and fire protection

Productivity and pricing

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