Construction Occupational Safety And Health Simulations

A collection of interactive 3D visualizations and simulations to help you master concepts in construction occupational safety and health.

Introduction to Occupational Safety and Health - Theory & Concepts

Basic principles and historical background of OSH in the construction industry.

Heinrich's Safety Triangle Explorer

Adjust the number of Major Injuries to see the statistical correlation with Minor Injuries and Near-Misses based on Heinrich's 1:29:300 ratio.

1Major

29Minor Injuries

300Near-Misses

Major Injuries Occurred1

Statistical Insight

For 1 major injury, statistical models predict there were roughly 300 unseen near-misses. To prevent the 1 major injury, safety managers must identify and mitigate those 300 leading indicators.

Ergonomics and Manual Handling - Theory & Concepts

Addressing musculoskeletal disorders and implementing ergonomic controls in construction tasks.

NIOSH Lifting Equation Simulator

Load Weight (lbs): 40

Horizontal Distance (inches from body): 15

H > 10 reduces safe limit.

Vertical Height (inches from floor): 30

Optimal is 30 inches (Power Zone).

Asymmetry Angle (degrees twisted): 0°

Lifting Risk Analysis

Recommended Weight Limit (RWL)34.0 lbs

Lifting Index (Weight / RWL)1.18

Moderate Risk (Intervention Recommended)

Scaffold Safety - Theory & Concepts

Design, erection, use, and dismantling of scaffolds focusing on load capacities and fall prevention.

Scaffold Load Capacity Calculator

Scaffold Duty Classification

Light (25 psf)Medium (50 psf)Heavy (75 psf)

Platform Width (ft)5 ft

Platform Length (ft)10 ft

Estimated Dead Load (lbs)500 lbs

Weight of planks, ledgers, and guardrails.

Platform Area:50 sq ft

Max Intended Live Load:2,500 lbs

Total Expected Load (Live + Dead):3,000 lbs

Req. Ultimate Capacity:12,000 lbs

Applies mandatory OSHA Safety Factor of 4.0

Fall Protection - Theory & Concepts

Systems and strategies to prevent falls from elevation, including guardrails and personal fall arrest systems.

Personal Fall Arrest System Clearance Calculator

Calculate the required clearance distance to prevent a worker from striking the lower level during a fall.

Lanyard Length (

L_L

) [ft]6

Deceleration Dist (

D_D

) [ft]3.5

Worker Height (

H_W

) [ft]6

Safety Factor (

S_F

) [ft]2

Anchorage Height (

H_A

) [ft]15

Required Clearance: 17.5 ft

6 + 3.5 + 6 + 2 = 17.5

Unsafe! The required clearance exceeds the anchorage height. The worker will strike the ground.

Anchorage (15 ft)

Required Drop (17.5 ft)

Ground (0 ft)

Excavation and Trenching Safety - Theory & Concepts

Hazards associated with earthmoving operations and protective systems like shoring and shielding.

Trench Lateral Earth Pressure Calculator

Analyze the lateral earth pressure acting on trench shoring systems based on soil properties and surcharge loads.

Trench Depth (

H

) [ft]10

Soil Unit Weight (

\\gamma

) [pcf]120

Internal Friction Angle (

\\phi

) [°]30

Surcharge Load [psf]0

Lateral Pressure Results

Active Earth Pressure Coefficient ( $K_a$ ): 0.333

Max Pressure at Bottom ( $P_a$ ): 400 psf

Total Active Force per LF: 2000 lbs/ft

Shoring systems (hydraulic struts or trench boxes) must be designed to withstand a total force of 2000 lbs for every linear foot of the trench wall to prevent a catastrophic cave-in.

0 ft

-10 ft

400 psf

Rankine Active Pressure Wedge

Electrical Safety in Construction - Theory & Concepts

Mitigating electrical hazards, proper grounding, and the use of GFCIs on construction sites.

Ohm's Law: Electrical Shock Hazard Simulator

Adjust the voltage and skin resistance to calculate the current flowing through a human body. Observe how physiological effects escalate dramatically with current (measured in milliamperes, mA).

Voltage (V): 120 Volts

Low VoltageStandard (120V)High Voltage

Body Resistance (R): 1,000 Ohms (Ω)

Wet/Broken Skin (1,000 Ω)Dry Intact Skin (100,000 Ω)

Calculated Current (I = V / R)120.00 mA(or 0.1200 Amps)

Physiological Effect

Severe burns. Cardiac arrest. Extremely lethal.

Heavy Equipment Safety - Theory & Concepts

Safe operation, inspection, and maintenance of cranes, bulldozers, and other heavy machinery.

Crane Stability Interactive Explorer

Adjust the Load Weight and Load Radius to observe the impact on overturning moments versus the resisting moment of the crane.

Load Weight (

W_{load}

) [tons]5

Load Radius (

D_{load}

) [ft]20

Crane Weight (

W_{crane}

) [tons]50

CG Radius (

D_{cg}

) [ft]6

Factor of Safety (

F_s

)1.2

Stability Status: Stable

Overturning Moment: 100.0 ton-ft

Resisting Moment: 300.0 ton-ft

Required Resisting Moment ( $M_o \times F_s$ ): 120.0 ton-ft

The crane's resisting moment exceeds the factored overturning moment. The lift is safe.

50t

Fire Protection and Prevention - Theory & Concepts

Strategies for preventing and extinguishing fires, managing flammable materials, and emergency response.

Fire Extinguisher Selection Simulator

1. Select Fire Class

2. Select Extinguishing Agent

✅ Effective: Agent matches the fire class safely.

Confined Space Entry - Theory & Concepts

Identifying, preparing, and safely entering permit-required confined spaces.

Confined Space Gas Monitor Simulation

Adjust the gas levels to see how the multi-gas monitor reacts to different atmospheric conditions.

Oxygen (O2): 20.9%

Hydrogen Sulfide (H2S): 0 ppm

Lower Explosive Limit (LEL): 0%

Carbon Monoxide (CO): 0 ppm

Multi-Gas Monitor

O2:

20.9%

H2S:

0 ppm

LEL:

CO:

0 ppm

ATMOSPHERE SAFE FOR ENTRY

Occupational Health Hazards - Theory & Concepts

Mitigating long-term health risks from noise, silica, lead, and ergonomic strain.

Noise Exposure Time Calculator (OSHA)

Use the slider to adjust the noise level (dBA) and see the maximum allowable exposure time per 8-hour shift based on OSHA's 5 dB exchange rate.

Noise Level: 90 dBA

80 dBA90 dBA (PEL)115 dBA

Max Allowable Time:8.00 Hours

Note: Exposure to continuous, varying, or intermittent noise above 115 dBA is not allowed under standard OSHA regulations without hearing protection.

Emergency Response and First Aid - Theory & Concepts

Site-specific emergency action plans, first aid provisions, and managing critical incidents.

Emergency Action Plan (EAP) Execution

Construction Site Map

Assembly Point

Zone A

Zone B

Zone C

Zone D

Normal Operations

Construction site operating normally. Workers distributed across the site.

The Emergency Action Plan (EAP) is developed and posted. Workers are aware of their designated assembly points.