C
Crompton Concepts
Temporary Works Barrier Design Tool
Review temporary barrier performance, compare systems, and calculate site-specific deflection requirements.
Stage 1: Risk Assessment
Selection of barrier always depends upon risk assessment. Complete the risk assessment below to determine the appropriate barrier requirements.
🎯 Design Type Selection
Select the type of design this risk assessment is for. Common risks will be pre-populated based on your selection.
Site Information
Risk Assessment Table
Evaluate each risk factor and assign a severity level (Low, Medium, High, Critical).
📄 Import/Export Risks
Upload risk assessment JSON file or generate from the riskpool.
ℹ️ Formatting Requirements
- PDF must contain a structured risk assessment table
- Columns: Hazard, Impact, Likelihood, Consequence, Controls, Risk Owner
- Use text-based PDFs (not scanned images without OCR)
- Likelihood/Consequence: Use numbers (1-5) or text (Rare, Likely, etc.)
- Best formats: PDF, Word (.docx), or Text (.txt) - PDF recommended
📊 Rating Scales Reference
Likelihood (Probability)
1 Rare - May occur in exceptional circumstances
2 Unlikely - Could occur at some time
3 Possible - Might occur at some time
4 Likely - Will probably occur
5 Almost Certain - Expected to occur
Consequence (Severity)
1 Insignificant - No injuries, low loss
2 Minor - First aid, medium loss
3 Moderate - Medical treatment, high loss
4 Major - Extensive injuries, major loss
5 Catastrophic - Death, huge loss
Risk Rating = Likelihood × Consequence
🎯 Risk Matrix
| Likelihood → Consequence ↓ |
1 Rare |
2 Unlikely |
3 Possible |
4 Likely |
5 Almost Certain |
| 5 Catastrophic | 5 | 10 | 15 | 20 | 25 |
| 4 Major | 4 | 8 | 12 | 16 | 20 |
| 3 Moderate | 3 | 6 | 9 | 12 | 15 |
| 2 Minor | 2 | 4 | 6 | 8 | 10 |
| 1 Insignificant | 1 | 2 | 3 | 4 | 5 |
Low (1-4)
Medium (5-9)
High (10-15)
Critical (16-25)
| S.N. | Hazard / Risk | Impact / Consequence | Likelihood | Consequence | Initial Risk | Risk Controls | Likelihood | Consequence | Residual Risk | Risk Owner | Action |
|---|
Risk Assessment Notes
Add additional notes or observations related to this risk assessment.
Risk Summary
Complete the risk assessment above to view summary.
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Impact Parameters
Eu = 1/2 m(v sin β)2
Barrier Config
Unit Specs
Estimated Results
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Design speed = work zone speed + 10.
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Barrier length excluding end treatment length.
Red: user entry required
Green: auto-filled, no change needed
Blue: auto-filled, editable
Base Deflection:
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Base Working Width:
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(Before length correction)
Units Displaced:
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n = Wi(V sin θ)2 / (2D · Wb g μ) + 2
Design Deflection:
-
Design Working Width:
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(Corrected for Design Length)
Layout Optimizer
Length / width fitEnter a target length to see a unit mix.
Validation hints will appear here after you run a calculation or pick an end treatment.
Analysis Matrix
Red values exceed available width.
Highlighted row = your design speed/angle
Red = exceeds available width
Width limit not set
Req. Energy scales deflection to your design length
Calculation Method (Step-by-step)
1. Impact Energy Calculation
Calculates the perpendicular kinetic energy of the impacting vehicle. The energy depends on vehicle mass (m), speed (v), and impact angle (β). Only the perpendicular component of velocity contributes to the impact.
Eu = ½ m(v sin β)² ÷ 1000 [Result in kJ]
2. Base Deflection Scaling (Energy Ratio)
Scales the reference test deflection to your impact scenario using energy proportion. The reference energy (RefEU) is computed from the standard test mass (2,270 kg), test speed, and 25° angle per MASH. If impact energy is lower, deflection will be less; if higher, deflection will increase proportionally.
Defl = TestDefl × (EU ÷ RefEU) [Scales with energy ratio]
3. Working Width Envelope
Combines the physical barrier width with the calculated deflection to determine the total lateral space (working width) required by the barrier system during impact. This is the design width needed for safe site layout.
WW = Barrier Width + Deflection [Total lateral space]
4. Impact Units Displaced (Work-Energy Balance)
Estimates how many barrier units will be pushed aside or knocked over by the impact. Uses impact energy balanced against the work done against friction and gravity. Formula: impact energy divided by (deflection × friction force × unit weight × gravity), plus 2 as a buffer.
n = ⌈ EU ÷ (Defl × μ × W × g) ⌉ + 2 [Number of units]
5. Design-Length Correction (Scaling to Your Site)
Adjusts energy and deflection calculations for your specific barrier installation length. If your barrier is longer or shorter than the test length, energy requirement scales inversely (longer barrier = less per-unit energy). The final "Estimated Deflection" is the deflection at your design length using the required energy.
ReqEU = EU × (TestLen ÷ DesignLen) [Scaled energy]
EstDefl = ReqEU × (TestDefl ÷ RefEU) [Final deflection at design length]
Matrix Output: Results are calculated for all speed-angle pairs above, allowing comparison of how deflection and working width change across different impact scenarios. Red rows highlight failures where design working width exceeds available site width.