Combine formwork, workers, stockpiles, and equipment loads into one estimate fast today. Apply allowance factors, check limits, and export results for coordination sitewide teams.
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Sample values below demonstrate how the allowance factor changes totals.
| Length (m) | Width (m) | Uniform Sum (kPa) | Equipment (dyn) (kPa) | γc | Factored Pressure (kPa) |
|---|---|---|---|---|---|
| 20 | 8 | 4.50 | 22.00 | 1.25 | 33.13 |
| 12 | 6 | 3.80 | 10.50 | 1.20 | 17.16 |
| 30 | 10 | 5.10 | 6.60 | 1.30 | 15.21 |
Deck area: A = L × W
Equipment pressure: peq = P / Ac
Dynamic equipment pressure: pdyn = peq × (1 + d/100)
Total unfactored pressure: ptot = puni + pdyn
Factored pressure: pf = γc × ptot
Total loads: W = p × A (since kPa = kN/m²)
Temporary deck loading often governs risk more than final design loads. Work crews, carts, and staged materials create short duration peaks, especially during concrete placement windows. This calculator consolidates uniform pressures with localized equipment bearing. Using an allowance factor helps convert a realistic plan into a conservative check for temporary supports and safe work sequencing.
Formwork and falsework commonly range from 0.5 to 1.0 kPa, depending on member density and decking. Reinforcement and embeds often add 0.2 to 0.5 kPa. Workers with hand tools are frequently modeled near 2.5 kPa for active placement zones during pours and finishing. Check project specifications before finalizing baseline values.
Stockpiles are the most adjustable contributor. Bagged cement, blocks, or bundled rebar can raise pressures to 1.0 to 2.0 kPa if concentrated. Spread storage and limit stack heights to control totals. Use marked laydown areas, just in time deliveries, and housekeeping to avoid unplanned accumulation. Document limits in the daily work plan.
Equipment is entered as a point load divided by an effective contact area. For example, 12 kN over 0.60 m² produces 20 kPa, comparable to 20 kN/m². Outriggers can be far higher, so use realistic pad sizes. The calculator then adds a dynamic percentage for movement and handling effects. Consider load sharing if multiple wheels track together.
A smooth deck with controlled travel paths may justify 5 to 10 percent, while ramps, bumps, and tight turning may need 15 to 30 percent. Dynamic allowance is not an impact analysis; it is a practical uplift for operations always. Combine it with spotter control, speed limits, and clear routes.
The construction factor multiplies the unfactored total pressure, providing a simple way to represent uncertainty and variability. Utilization compares factored pressure and factored total load against your allowable limits. Values above 100 percent signal a need to reduce contributors or increase temporary capacity before work begins.
Exported CSV helps reviewers verify assumptions, compare scenarios, and track revisions. The PDF report is useful for permit files, toolbox talks, and inspection records. Include equipment type, pad size, and location notes on the deck plan. Coordinate with engineering for any change in means and methods.
Lower demand by spreading loads, widening bearing pads, and restricting simultaneous activities. Define maximum stockpile quantities and dedicated travel lanes. Use temporary shoring, strongbacks, or additional beams where needed. Recalculate whenever staging changes. Consistent communication keeps the allowance model aligned with actual site behavior.
It reports unfactored and factored deck pressure in kPa and total load in kN, plus component load breakdowns. You can compare these against allowable limits and export the results to CSV or PDF.
Use your project temporary works guidance or engineering direction. If you lack a specified value, pick a conservative factor reflecting variability in staging, movement, and uncertainty, then verify with the temporary works designer.
Deck checks often use pressure or distributed load. Converting a concentrated reaction P over contact area Ac gives kPa, making it easy to combine with uniform pressures and to compare with allowable capacity assumptions.
Use the effective footprint actually bearing on the deck, including pads, timbers, or mats. For outriggers, include the full pad plan area. For wheels, use the contact patch or a conservative equivalent area if uncertain.
Yes. If allowable pressure or allowable total load is set to zero, the utilization check is skipped. You can still use the factored results to compare scenarios or to share with an engineer for formal verification.
No. It is a planning uplift for typical construction movement and handling. If you expect impact, dropping loads, or significant vibration, consult engineering for a specific dynamic assessment and tighten operational controls.
Recalculate whenever equipment changes, stockpiles shift, pad sizes change, shoring is modified, or sequencing differs. Small operational changes can move peak demand, so updating the model supports safer, well documented decisions.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.