What the Calculator Actually Works Out
There are three numbers every civil, and mechanical engineer needs a single girder EOT crane before they can size the runway beam and column accurately.Maximum Wheel Load (kN)
Total Vertical Load on Gantry (kN)
Recommended Gantry Section
The Formula Behind It
The wheel load formula follows standards IS 807 and IS 3177
Max Wheel Load = [(SWL + Hoist Weight) ร Impact Factor + Dead Weight of Bridge / 2] รท Number of Wheels per Rail
Single Girder Span and Capacity Quick Reference
| SWL (Tons) | Practical Max Span | Typical Girder Type | Approx. Bridge Dead Weight |
|---|---|---|---|
| 1โ3 | Up to 12 m | Rolled I-beam | 8โ14 kg/m |
| 5 | Up to 18 m | Fabricated box | 25โ38 kg/m |
| 7.5โ10 | Up to 22 m | Box girder | 45โ65 kg/m |
| 12โ15 | Up to 25 m | Reinforced box | 70โ105 kg/m |
How to Calculate EOT Crane Wheel Load? Max Vertical Load & Gantry Beam Selector
Structural Engineering Utility for Single Girder Cranes & Gantry Design
๐๏ธ Structural Analysis Report
| Max Wheel Load (Vertical): | kN |
| Total Load on Gantry (Incl. Impact): | kN |
| Recommended Gantry Section: |
Note: Selection is indicative. Final structural design must be verified by a licensed Civil/Structural Engineer.
Above calculator improves the efficiency of a single girder eot crane and helps to maintain the general load over the cranes.
Single girder electric overhead traveling crane EOT known to lift light weight material in small scale workshops and fabrication yards. It is designed with single beam supported by end carriages on elevated runway gantries. It lift the loads with lifting forces, trolley travel forces, and environmental loads and maintain the structural rigidity.
While selecting the EOT crane for your plant it is necessary to calculate the maximum wheel load, bridge bending moment, and vertical deflection is required when sizing crane runways, rail profiles, and identify gantry column capacity.
Hence, use our single girder EOT crane load calculator below to get the maximum wheel reaction, bending moments, and ratio for your crane configuration.
Fundamental Forces in Single Girder EOT Cranes
When an EOT crane operate in workshop, it’s structural bridge girder experience a combination of static, dynamic, and torsional loads.
1. Safe Working Load (SWL)
It is the maximum payload capacity lifted by wire rope hoist or electric chain hoist (kN or Tons).
2. Hoist & Trolley Dead Weight (Whoist)
It is the self-weight of underslung cross traveling trolley hoist mount on the bottom flange of the Main girder.
3. Bridge Girder Self-Weight (Wbridge)
It is the structural weight of the Main rolled I-beam, including platform walkways and electrification channels.
4. Vertical Dynamic Impact Factor (ฯ)
It is an acceleration formula applied to the lifted load and hoist weight to determine for sudden hoisting phrases, emergency stopping, and surface rail irregularities (1.15โ1.25).
5. Lateral Surge (F)
Horizontal force caused by speed, breaking of the hoist trolley and analysed as 10% of the SWL and trolley weight at the rail head.
Key Engineering Equations
The structural calculations for a single girder EOT crane consider the live load, dead load, bending moment, wheel reaction, wheel load, and allowable vertical deflection.
Step-by-Step Calculation Example
Let’s assume a workshop with a 10 ton SWL single girder EOT crane.
Input Parameters
- Safe Working Load (SWL): 10.0 Metric Tons (98.1 kN)
- Crane Span (L): 15.0 meters
- Hoist & Trolley Weight (Whoist): 1.2 Tons (11.77 kN)
- Bridge Girder Weight (Wbridge): 3.5 Tons (34.34 kN)
- Minimum Hook Approach (e): 0.8 meters
- Impact Factor (ฯ): 1.25
- Girder Dead Load Factor (ฮณ): 1.10
Step 1: Calculate Live and Dead Loads
Plive = (10.0 + 1.2) Tons ร 9.81 m/s2 ร 1.25 = 137.34 kN
Pdead = 3.5 Tons ร 9.81 m/s2 ร 1.10 = 37.77 kN
Step 2: Calculate Maximum Bending Moment (Mmax)
Mlive = (137.34 kN ร 15.0 m) / 4 = 515.02 kNm
Mdead = (37.77 kN ร 15.0 m) / 8 = 70.82 kNm
Mmax = 515.02 kNm + 70.82 kNm = 585.84 kNm
Step 3: Calculate Maximum Reaction and Wheel Load (Pwheel)
Rmax = [137.34 kN ร (15.0 โ 0.8)] / 15.0 + 37.77 kN / 2 = 130.01 kN + 18.89 kN = 148.90 kN
Pwheel = 148.90 kN / 2 wheels = 74.45 kN / wheel (โ 7.59 Tons / wheel)
Step 4: Check Allowable Deflection Limit (CMAA Class C: L / 880)
ฮดallowable = 15,000 mm / 880 = 17.05 mm
Best Practices for Single Girder Crane Design
1. Optimize End Truck Wheelbase
Manage wheel base to span ratio (WB/L) between 1/6โ1/7 to avoid maximum crane crabbing along the runway beams.
2. Account for Underslung Flange Bending
For I-beam bridge girders with underslung trolleys, analyse local flange bending stress delivered by wheel contact pressures on the bottom flange.
3. Verify Runway Beams Web Buckling
Confirm runway gantry beams are reinforced with stiffener plates at force by columns to withstand localised wheel point loads.
