Reaction
R = P / 2
Structural calculator
Truss Analysis Calculator
Calculate support reactions for a simply supported symmetric truss load.
Calculator
Enter structural values
Select units beside each input. Results update automatically.
Result
About this calculator
How it works
This simplified calculator estimates reactions and a basic diagonal force scale for a symmetric triangular truss. Full truss analysis requires joint geometry and connectivity.
Formulas
Formulas used
Diagonal angle
theta = atan(2h / span)
Diagonal force scale
F = R / sin(theta)
Worked example
Example calculation
Reaction
20 kN central load gives 10 kN at each support
Guide
How to use this calculator
- Enter the relevant load, stress, geometry, material, or member values.
- Select units beside each input where unit menus are shown.
- Use the highlighted result for screening, then check assumptions before design use.
Reference
What the results mean
Support reaction
Vertical support force for a symmetric central load.
Diagonal force scale
Approximate member force scale for a simple triangular layout.
Assumptions and limits
Before using the result
- These are simplified elastic or empirical checks for early-stage engineering review.
- Final structural design requires correct boundary conditions, load paths, code checks, material data, factors of safety, and professional review.
- Complex tools here provide key values or simplified estimates rather than a full structural analysis model.
FAQ
Truss Analysis Calculator questions
Are these results suitable for final structural design?
Use these calculators for education, screening, and early checks only. Final structural design must follow applicable codes, load combinations, safety factors, material data, and qualified engineering review.
Why can real structures differ from these results?
Real structures include boundary conditions, imperfections, connection behavior, load eccentricity, dynamics, residual stress, buckling modes, fatigue, and code-specific requirements.
Can I use different units?
Yes. Select units beside inputs where menus are shown. Values are converted internally before solving.
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