Facade Billboard Structural Wind-Load & Anchor Forensics Lab

Incident Scenario Presets

Structural Geometry

Billboard Width: 12.0 m

Billboard Height: 6.0 m

Facade Mount Elevation: 18.0 m

Cantilever Arm Projection: 1.6 m

Mounting Bracket Groups: 4

Anchorage & Material State

Anchor Bolt Diameter: M20 (20mm)

Steel Grade / Anchor Spec:

Environmental Corrosion Loss: 25%

WARNING: HIGH MOMENT Gust dynamic pressure approaching design limit

60 FPS | CAD Scale: 1:35

Peak Wind Gust Velocity: 95 km/h

Exposure Category

Drag Coeff (C_f)

Structural Stress Metrics

Velocity Pressure (q_z)

0.68 kPa

14.2 psf

Total Wind Force (F_w)

68.5 kN

Across 72.0 m² face

Overturning Moment

109.6 kNm

At facade bracket hinge

Tensile Bolt Pullout

41.2 kN/bolt

Capacity: 48.0 kN

Anchor Bolt Utilization Ratio (UR)

85.8%

Safe (<70%) Yield Warning (70-100%) Failure (>100%)

Drop Trajectory & Ground Hazard

Estimated Fall Horizon: 14.6 m from wall

Freefall Impact Kinetic Energy: 44.1 kJ

Roadway and pedestrian sidewalk are inside direct collapse arc under 95 km/h crosswinds.

Forensic Audit Ledger

Sign Self-Weight (Dead Load)	2,880 kg (28.2 kN)
Effective Corroded Bolt Area	235.6 mm² (-25%)
Shear Stress / Allowable	92.4 / 160 MPa
Factor of Safety (FoS)	1.17 (Critical)
Clearance Setback Required	21.9 m (1.5x buffer)

STRUCTURAL FORENSIC INCIDENT CLEARANCE DOSSIER