Plan shoring layouts with realistic load distribution. Enter post stiffness and spacing to model sharing. Export results to site logs, drawings, and approvals daily.
| Scenario | Total load | Posts | Stiffness set | Highest load share | Typical use |
|---|---|---|---|---|---|
| Balanced line | 200 kN | 4 | 50, 50, 50, 50 kN/mm | 25% | Uniform tightening and bracing |
| One stiffer post | 200 kN | 4 | 80, 50, 50, 50 kN/mm | 34.8% | Corner post with extra restraint |
| Area-based check | 20 m² × (3+2) kPa | 6 | 60, 55, 50, 45, 40, 35 kN/mm | 21.1% | Slab shoring under mixed site loads |
Load share is calculated from relative post stiffness, reflecting how tighter or better braced shores attract more force. When posts settle equally, the fraction of total load carried by each post equals kᵢ divided by the sum of all k values. This matches common field observations where a stiff corner shore picks up additional demand. The calculator reports both percent share and assigned load clearly.
Construction loading is rarely steady, so the tool applies two multipliers to create factored demand for planning. The safety factor increases the base load for conservative checks, while the impact factor accounts for placement shocks, vibration, and short-duration peaks. In area mode, pressures are converted to total load using area times (dead plus live) intensity. Using consistent factors across layouts enables quick comparison of alternatives.
Each post’s assigned load is compared against an entered allowable capacity to produce utilization for review. A value under 1.00 indicates reserve strength, while values above 1.00 are flagged as Over. Review the worst utilization first, then verify that the allowable reflects the correct shore rating, extension, and bracing condition. If capacity is unknown, enter a conservative placeholder and refine after checking manufacturer tables.
To reduce overloads, you can add posts, increase the capacity of critical posts, or reduce stiffness concentration by improving uniform tightening on site. If one post is much stiffer, consider adding bracing to neighboring posts or adjusting screw-jack preload to share demand. In area mode, re-check tributary area assumptions and confirm that stacked material limits are realistic. Small stiffness changes can shift load share noticeably.
Field teams often need a simple record of assumptions, inputs, and results for coordination. The built-in exports create a CSV for spreadsheets and a printable PDF summary suitable for logs and work packs. Record the load mode, factors, and post properties next to the shoring sketch, then save the output with the date and pour sequence. This supports consistent communication across crews, supervisors, and inspectors.
It is an effective spring value for each post, reflecting tightness, bracing, extension, and restraint. Higher stiffness attracts a larger fraction of the total load in the sharing calculation.
If one shore is significantly stiffer, the stiffness ratio increases its share. Uneven preload, stronger bracing, or shorter extension can create this stiffness concentration.
Total load equals supported area multiplied by dead plus live pressure. The calculator then applies the safety and impact factors to create a factored demand used for distribution.
Assigned load exceeds the entered allowable capacity for that post, so utilization is above 1.00. Add posts, increase capacity, or rebalance stiffness to reduce demand on that member.
Use factors consistent with your engineered shoring plan and local practice. The tool supports screening and comparison; final values should match the approved design method and documentation.
Yes. After a successful submit, download CSV for spreadsheets or PDF for printing. Save exports with the pour sequence, date, and shoring sketch reference for traceability.
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.