WIND DRAG: 28.0 mph
SUSPENDED LOAD: 18.5 tons
GROUND SUBSTRATE: Compacted Fill
MOMENT RATIO (OT/R): 0.658
Incident Presets:
Stability Margin
34.2%
Critical limit: < 15%
Tip Risk Level
Moderate
Overturning threshold
Dispatch Status
Contained
Miami Fire Rescue Triage
Hospitalized
4
Trauma unit transport
Fatalities
0
Zero deaths confirmed
Official Dispatch Record & On-Scene Findings
City of Miami Fire Rescue Chief Statement
08:14 AM
911 Inbound Alert: Tower crane lattice buckle reported at downtown Miami construction parcel. Boom collapsed across perimeter scaffolding into adjacent vehicular lane, igniting a parked passenger vehicle.
08:18 AM
First Units On-Scene (4.5 min response): Engine 2 and Rescue 1 establish unified command. Rapid foam suppression deployed against burning vehicle; secondary search of cab and lower debris field initiated.
08:29 AM
Triage & Trauma Evacuation: Exactly 4 individuals triaged for non-life-threatening blunt force trauma and smoke inhalation; transferred to Ryder Trauma Center. Zero fatalities confirmed by Fire Chief.
08:45 AM
Structural Rig Securing: Outrigger soil subsidence inspected; primary boom load isolated to prevent secondary rollover. Incident declared fully contained.
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Structural & Wind Controls
Interactive Rig Tuning
28 mph
18.5 tons
22 ft
4.5 min
Moment Equilibrium Math
Crane rollover occurs when the Overturning Moment ($M_{OT}$) created by the suspended load and lateral dynamic wind shear exceeds the Resisting Moment ($M_R$) anchored by counterweights and outrigger radius.
Margin = (1 - (M_OT / M_R)) × 100%
M_OT = (Load × Arm) + (C_d × Wind² × Area)
M_R = Base_Weight × Outrigger_Radius × Soil_Factor
M_OT = (Load × Arm) + (C_d × Wind² × Area)
M_R = Base_Weight × Outrigger_Radius × Soil_Factor
In Monday's incident, high lateral wind gusts combined with heavy payload moment shifted the center of gravity past the outrigger fulcrum, causing the jib to collapse across construction barriers.
OSHA 1926.1400 Compliance
● Safe Operating Envelope
> 50% Margin
● Moderate Risk (Incident Level)
20% - 50%
● Imminent Structural Failure
< 20% Margin