Scope & assumptions
Rigid plate / elastic bolt-group idealization. Identical bolts; in-plane direct shear shared equally; torsional shear distributed proportional to radius from group centroid.
METRIC REPUBLIC ENGINEERING · PRELIMINARY
Bolt Group Calculator
Elastic in-plane bolt-group force distribution for direct shear plus torsional moment about the group centroid.
Elastic methodCode-neutral demand
Calculation basis
Fx,i = Vx/n − Mz·yi/J; Fy,i = Vy/n + Mz·xi/J; J = Σ(xi²+yi²); Fi = √(Fx,i²+Fy,i²).
Important engineering note: This calculator gives bolt force demand only. It does not check bolt resistance, bearing, slip, prying, plate bending, edge distances, block shear or connection ductility. Transparent preliminary engineering checks with user-visible assumptions and formulas. Final design must be verified to the applicable code, National Annex and project requirements.
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Frequently asked questions
Is this a complete code design?
No. It is a transparent preliminary calculation. Code-specific limits, detailing, stability and project conditions must be verified independently.
Can I use the result for construction?
Use the result as a screening or checking aid only. Final design and construction documents should be verified by a qualified professional where required.
Why are some resistance factors entered by the user?
Many design standards contain member-, material-, product- or project-specific values. Metric Republic keeps these visible and user-controlled instead of hiding assumptions.