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Lifting Lug Calculator

Pick a methodology route. The selected family drives the governing check; the other families are shown as cross-checks. Toggle SI / US customary units at any time.

Inputs

Inputs displayed in SI (mm, kN, MPa). Allowables are user-supplied.

Project

Metadata used on the report header.

Project name

Revision

Client

Methodology routeThe selected route becomes the primary utilisation basis; other frameworks are still computed and shown as a cross-check panel.

Preset

Load

Design load at the pin, dynamic factor, and sling angle from the vertical lug axis.

Design loadkN

Dynamic factor×

Lifting angledeg

Above 30° → FEA recommended

Geometry

Single-plate dimensions at the pin cross-section.

Plate thickness tmm

Plate width wmm

Hole diameter dmm

Pin diameter

d_{p}

Edge distance

a

Hole centre to free edge along load line

Lug material

Allowable stresses are user-supplied; no code factor is applied here.

F_{y}

(yield)MPa

F_{u}

(ultimate)MPa

Allow. tensionMPa

Allow. shearMPa

Allow. bearingMPa

Pin material

Optional; needed for the pin double-shear check.

F_{y}

MPa

Pin allow. shearMPa

Weld design

Angle-aware fillet-weld group analysis: topology, geometry, allowables, and a live section-property + force-decomposition summary.

Weld topology

Parallel → two line welds along the lug sides. All-around → closed perimeter (adds end welds of length

t

) with AWS A2.4 weld-all-around symbol.

Leg size

s

Throat a = 0.707·s

Side length

L

Lug height

h

Pin centre to weld centroid (lever arm for V·h)

Electrode

F_{E X X}

MPa

E70xx ≈ 483 MPa, E80xx ≈ 550 MPa

Allow. shear

τ_{allow}

MPa

Allow. tension

σ_{allow}

MPa

For von Mises check; falls back to τ·√3

Derived — force decomposition & section properties

N = F cos θ

100 kN

V = F sin θ

0 N

M = V \cdot h

0.0 N·m

a

throat5.7 mm

A_{w}

2036 mm²

S_{w}

61085 mm³

θ =

0.0° from the lug axis; displayed values update live as you change inputs.

Scenario

Environment and allowances affecting effective geometry.

Offshore / marine lift (triggers DNV-ST-N001 scope warning)

Corrosion allowancemm

Preliminary design / quick verification tool. Not a replacement for FEA or full engineering review. Code-specific allowables remain user-supplied until the corresponding standard clause is validated.

Schematic

Front elevation, weld detail, and load decomposition. A qualitative check that geometry and loading are not obviously wrong; the free-body view summarises the decomposition used by every weld check.

Orthographic views

Load decomposition

Overall status

0.000Pass

Status only — unlock the report to reveal the governing utilisation.

Governing check

Double-plane shear-out (mechanics)

000 / 000

Utilisation figures are hidden. Unlock the report to reveal every number.

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Primary checks — Mechanics of Materials

Governing utilisation is computed from these checks only.

7 active

Net-section tension (mechanics)

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

SourceMechanics of Materials — net-section tension

Double-plane shear-out (mechanics)

Governing

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

SourceMechanics of Materials — double-plane shear-out

Pin bearing on lug (mechanics)

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

SourceMechanics of Materials — bearing stress

Pin double shear (mechanics)

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

SourceMechanics of Materials — pin double shear

Fillet weld throat resultant (mechanics)

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

SourceMechanics of Materials — fillet weld throat resultant

Fillet weld von Mises throat stress (mechanics)

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

von Mises throat stress: $σ_{eq} = σ_{⊥}^{2} + 3 (τ_{⊥}^{2} + τ_{∥}^{2})$ .

SourceMechanics of Materials — von Mises throat stress

Fillet weld strength — AISC 360-22 §J2.4

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

Directional increase factor $(1 + 0.5 sin^{1.5} θ) = 1.500$ at $θ_{res} = 90. 0^{\circ}$ .
Nominal throat strength $F_{n w} = 0.60 F_{E X X} (1 + 0.5 sin^{1.5} θ) = 434.7 MPa$ .

SourceAISC 360-22 §J2.4

Cross-check (other frameworks)

Independent utilisations from the other methodology families, shown for comparison. Not included in the governing banner.

15 active

ASME BTH-1-2020

Net-section tension — BTH-1 §3-3.3.1

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

SourceASME BTH-1-2020 §3-3.3.1 · ASME BTH-1-2020 §3-1.3

Single-plane fracture — BTH-1 §3-3.3.1

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

Edge distance $R$ is less than $1.0 w$ . BTH-1 §3-3.3 formulas for pinned connections are derived based on larger $R / w$ ratios.

SourceASME BTH-1-2020 §3-3.3.1 · ASME BTH-1-2020 §3-1.3

Double-plane shear-out — BTH-1 §3-3.3.1

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

SourceASME BTH-1-2020 §3-3.3.1 · ASME BTH-1-2020 §3-1.3

Pin bearing — BTH-1 §3-3.3.4

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

Service Class 0 — static bearing coefficient $1.25$ applied (eq 3-53).

SourceASME BTH-1-2020 §3-3.3.4 · ASME BTH-1-2020 §3-1.3

Fillet weld allowable — BTH-1 §3-3.4.3

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

Clause allowable $F_{v} = \frac{0.60 F _{E X X}}{1.20 N _{d}} = 80.5 MPa$ ; compared to the resultant throat stress $f_{res}$ .

SourceASME BTH-1-2020 §3-3.4.3 · ASME BTH-1-2020 §3-1.3

EN 1993-1-8:2005 §3.13

Pin-plate geometry — EC3 §3.13.1

Fail

Demand

000.0

Capacity

000.0

Utilisation

000.0

Table 3.9 Type A (given thickness); $a$ and $c$ measured from the hole edge — provided $a$ = edge distance $- d_{0} /2$ .
End distance $a = 34.0 mm$ (hole edge → plate end) is below the Table 3.9 minimum of 41.7 mm.
Informational: the Table 3.9 Type B route would additionally require $d_{0} \leq 2.5 t$ (here $d_{0} = 52.0$ mm vs $2.5 t = 50.0$ mm); Type B applies only to the specific lug shape drawn in the table.

SourceEN 1993-1-8:2005 §3.13.1

Pin shear — EC3 §3.13.2

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

Two shear planes assumed (single lug in clevis).

SourceEN 1993-1-8:2005 §3.13.2

Plate bearing — EC3 §3.13.2

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

SourceEN 1993-1-8:2005 §3.13.2

Pin bending — EC3 §3.13.2

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

Moment from EN 1993-1-8 §3.13.2 Figure 3.11: $M_{Ed} = \frac{F _{Ed}}{8} (b + 4 c + 2 a)$ .

SourceEN 1993-1-8:2005 §3.13.2

Pin combined shear + bending — EC3 §3.13.2

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

Two shear planes assumed (single lug in clevis), matching the pin-shear check.

SourceEN 1993-1-8:2005 §3.13.2

Fillet weld — EN 1993-1-8 §4.5.3.2 directional method

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

Criterion (a) combined: $σ_{eq} = 69.5 MPa \leq \frac{f _{u}}{β _{w} γ _{M 2}} = 435.6 MPa$ → $u_{a} = 0.159$ .
Criterion (b) normal: $σ_{⊥} = 34.7 MPa \leq \frac{0.9 f _{u}}{γ _{M 2}} = 352.8 MPa$ → $u_{b} = 0.098$ .
Governing criterion: combined (a).

SourceEN 1993-1-8:2005 §4.5.3.2

Fillet weld — EN 1993-1-8 §4.5.3.3 simplified method

Pass

Demand

000.0

Capacity

000.0

Utilisation

000.0

Design throat shear $f_{v w, d} = \frac{f _{u} / 3}{β _{w} γ _{M 2}} = 251.5 MPa$ .
Resistance per unit length $F_{w, R d} = f_{v w, d} \cdot a = 1422.3 N/mm$ ; demand $F_{w, E d} = 277.8 N/mm$ .

SourceEN 1993-1-8:2005 §4.5.3.3

DNV-ST-N001 §16

Dynamic amplification factor — DNV-ST-N001 §16

Info

Demand

000.0

Capacity

000.0

Utilisation

000.0

Table 16-1 (onshore column) $DAF = 1.10$ at $SHL = 10.2$ t (items < 3 t taken as 3 t). SHL should include rigging weight — confirm against the project-specific value.

SourceDNV-ST-N001 §16.2.5

Skew-load factor — DNV-ST-N001 §16

Info

Demand

000.0

Capacity

000.0

Utilisation

000.0

Single-lug padeye default $SKL = 1.10$ . Multi-sling redistribution is out of scope for v1.

SourceDNV-ST-N001 §16.2.6

Lift-point consequence factor — DNV-ST-N001 §16.8.3

Info

Demand

000.0

Capacity

000.0

Utilisation

000.0

Table 16-5 consequence factor for lift points including their attachments: $γ_{c} = 1.30$ , applied on the demand side per §16.8.4.1.

SourceDNV-ST-N001 §16.8.3

Assumptions used

These assumptions back the implemented checks. They will appear in the report alongside the result table.

Geometry is a single-plate lug / padeye without cheek plates. Cheek-plate configurations are out of scope for v1 and require detailed analysis.
Load is applied in the plane of the lug. Out-of-plane bending from sling misalignment is treated via a user-supplied dynamic / skew factor only.
Behaviour assumed linear-elastic, isotropic, homogeneous. No plastic redistribution, residual stresses, or fatigue effects are considered.
Load line passes through the hole centre. Eccentricities between sling and lug centreline are not explicitly evaluated.
Allowable stresses are supplied by the user. The app does NOT apply any code-specific allowable factor (ASME BTH-1 $0.45 F_{y}$ , Eurocode $γ_{M}$ , DNV DAF, etc.) until the corresponding source clause has been supplied and validated.
Pin-to-hole fit is assumed reasonable (pin diameter slightly less than hole diameter). Extreme clearances or wear are not modelled.
Bearing stress is taken as the projected nominal value $σ_{b} = \frac{F}{d _{p} t}$ ; actual contact stress peaks are not resolved.
Fillet welds are symmetric about the load line. The weld group is analysed with $N = F cos θ$ , $V = F sin θ$ , $M = V \cdot h$ (in-plane bending). Root components $f_{z} = N / A_{w} + M / S_{w}$ and $f_{v} = V / A_{w}$ are transformed to throat stresses $σ_{⊥} = τ_{⊥} = f_{z} / 2$ and $τ_{∥} = f_{v}$ . Out-of-plane (sling skew) effects and asymmetric weld runs remain out of scope in v1.

Export

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ProjectExample project

RevisionA

Methodologymechanics_raw

Enginev0.2.0

Preview and review for free; unlock when you're ready to print or save as PDF. Scope disclaimers stay on every report — this is a preliminary design tool, not a substitute for FEA or full engineering review.

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