Wind at Hook Height — Out-of-Service Storm Check
Power-law wind speed at crane height for a out-of-service storm check, with gust estimate and limit check.
Tower cranes survive storms by weathervaning — slew brake released, jib free. The check that matters BEFORE the storm: does the forecast gust at jib height exceed the crane's out-of-service design speed (commonly 151 km/h to EN 14439 class C25)? This profile math answers at YOUR height.
Formula
Note: Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
Power-law wind speed at crane height for a out-of-service storm check, with gust estimate and limit check. A free crane load, wind & rigging safety tool — no sign-up, no upload, instant results in your browser.
About Wind at Hook Height — Out-of-Service Storm Check
Wind at Hook Height — Out-of-Service Storm Check computes the governing relationship v(z) = v₁₀ · (z/10)^α [power-law profile] live as you type. Tower cranes survive storms by weathervaning — slew brake released, jib free. The check that matters BEFORE the storm: does the forecast gust at jib height exceed the crane's out-of-service design speed (commonly 151 km/h to EN 14439 class C25)? This profile math answers at YOUR height. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Wind at Hook Height — Out-of-Service Storm Check
- 1Enter your values — Reference wind at 10 m, Hook/jib height, Terrain exponent α, Gust factor and more (sensible defaults are pre-filled).
- 2Read the live results: Mean wind at height, Gust at height, Amplification vs 10 m.
- 3Check the "with your numbers" line to see v(z) = v₁₀ · (z/10)^α [power-law profile] substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Wind at Hook Height — Out-of-Service Storm Check?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula v(z) = v₁₀ · (z/10)^α [power-law profile] with authoritative sources cited on the page (ASCE 7 — Wind load provisions (power-law profiles); EN 13001 / EN 14439 — Crane design & tower crane standards)
- ✓Tower cranes survive storms by weathervaning — slew brake released, jib free.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the wind at hook height — out-of-service storm check use?+
It evaluates v(z) = v₁₀ · (z/10)^α [power-law profile], exactly as published. Sources: ASCE 7 — Wind load provisions (power-law profiles); EN 13001 / EN 14439 — Crane design & tower crane standards. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Tower cranes survive storms by weathervaning — slew brake released, jib free. Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
When is this calculator the right tool for the job?+
Power-law wind speed at crane height for a out-of-service storm check, with gust estimate and limit check. A free crane load, wind & rigging safety tool. The check that matters BEFORE the storm: does the forecast gust at jib height exceed the crane's out-of-service design speed (commonly 151 km/h to EN 14439 class C25)? This profile math answers at YOUR height. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
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