VitraLab Aluminium Bearing Tool

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1. Action

ULS Shear Input

Applied ULS shear on one bolt (kN) Number of shear planes

Applied ULS shear per shear plane = applied ULS shear on one bolt / number of shear planes.

2. Material and bolt

Strength and Size

Bolt head type Countersink depth (mm) Bolt strength, f_ub (N/mm2) Material strength, f_u (N/mm2) Thickness, t (mm) γ_M2 Bolt diameter, d (mm) Hole diameter, d₀ (mm)

3. Hole and geometry

Distances

Hole type Code cap for α_b α_b used Load Direction e1 parallel (mm) e2 perpendicular (mm) e3 clear, load direction (mm) e4 clear, perpendicular (mm)

Not code valid for this slotted-hole check. EN 1999 applies where the load is perpendicular to the longitudinal axis of the slotted hole.

4. Geometry Guide

e1/e2 Diagram

Basis: EN 1999-1-1 bearing resistance for a single bolt treated as an end/edge bolt.

e1 is measured parallel to the load direction. e2 is measured perpendicular to the load direction.

5. Result

Bearing Summary

Code basisEN 1999-1-1

Applied ULS shear per plane-

Effective t-

Effective d0-

Effective e1 / e2-

α_d-

f_ub/f_u-

α_b-

k₁-

Hole factor-

Base F_b,Rd-

Final F_b,Rd-

Utilization-

Status-

Code applicability-

6. Code notes

Visible Limitations

This draft treats the checked bolt as a single end/edge bolt for facade-style one-bolt bearing checks.
Net-section resistance, bolt shear resistance, tension interaction, and full connection behaviour may still require separate checks.
Oversized and short slotted holes use 0.80 times the normal-hole bearing resistance. Long slotted holes use 0.65 times the normal-hole bearing resistance.
For countersunk bolts, bearing resistance is based on connected plate thickness minus half the countersink depth.
For slotted holes, EN 1999 limits α_b to 0.66 and uses e1 = e3 + d/2 and e2 = e4 + d/2.
For short slotted holes, slot length should not exceed 1.5(d + 1 mm). For long slotted holes, slot length should not exceed 2.5(d + 1 mm).
For slotted holes, e3/e4 are clear distances to the slotted hole edge, not distances to the slot centreline.
Aluminium bolts should not be used in slotted holes unless a qualified engineer confirms the project basis.

This calculation is provided for preliminary guidance only. VitraLab does not certify or approve the final design. All structural designs must be reviewed and approved by a qualified engineer before manufacture, installation, or use.

7. Report preview

Aluminium Report

VitraLab

Aluminium Single Bolt Bearing Check

Input Summary

Code basisEN 1999-1-1

Applied ULS shear on one bolt-

Number of shear planes-

Hole type-

Bolt head type-

Bolt diameter / effective hole-

Effective e1 / e2-

α_b used-

Result Summary

Base bearing resistance-

Hole factor-

Final bearing resistance-

Applied ULS shear per plane-

Utilization-

Preliminary guidance only. VitraLab does not certify or approve final design. Review by a qualified engineer is required before use.