Run preliminary beam and axial-member checks in one place. The calculator reports reactions, internal force effects, stresses, movement, capacity, and a basic screening status.
Member Input
Beam calculations assume a simply supported, rectangular section. Axial compression uses an Euler buckling screen. Enter service or design inputs consistently with your selected load factor.
Example Data
| Check | Example input | Purpose |
|---|---|---|
| Beam span | 6.00 m | Distance between simple supports. |
| Uniform load | 8.00 kN/m | Distributed gravity or service loading. |
| Point load | 12.00 kN at 3.00 m | Concentrated equipment or framing load. |
| Rectangular section | 150 mm × 300 mm | Provides area, inertia, and section modulus. |
| Steel modulus | 200 GPa | Controls calculated elastic deflection. |
Formula Used
Beam reactions: RL = wL / 2 + P(L − a) / L and RR = wL / 2 + Pa / L.
Beam moment: M(x) = RLx − wx² / 2 − P(x − a), after the point load.
Rectangular section inertia: I = bh³ / 12. Section modulus is Z = I / (h / 2).
Bending stress: σ = M / Z. Approximate rectangular peak shear stress is τ = 1.5V / A.
Uniform-load deflection: y(x) = wx(L³ − 2Lx² + x³) / 24EI. Point-load deflection uses the standard simply-supported piecewise equation.
Axial member: σ = P / A, Δ = PL / AE, and Euler capacity Pcr = π²EI / (KL)².
How to Use This Calculator
- Choose a beam or axial member calculation.
- Select a material preset, or enter verified values manually.
- Enter geometry, loading, and restraint information using the displayed units.
- Set the load factor and target safety factor for the intended screening case.
- Submit the form. Results appear above the inputs below the header.
- Review pass status, stresses, deflection, capacity, and all assumptions.
- Download CSV data or print the result panel for project records.
Important: This tool does not replace a code-compliant structural design. It does not check lateral torsional buckling, load combinations, bearing, connections, vibration, fire, durability, or serviceability provisions beyond the selected deflection ratio.
Statics and Material Strength Checks
Statics and strength of materials connect loads with safe member behavior. A calculator can turn basic geometry, material properties, and loading into useful design indicators. It is helpful during concept work, estimating, and preliminary checks. Final designs still require licensed engineering review and applicable building codes.
Beam Actions and Reactions
Beam checks begin with support reactions. Reactions balance vertical loads at the supports. The calculator then samples the span to identify the largest bending moment and shear force. Those values reveal where a member experiences its strongest internal actions. The method supports a simply supported beam carrying a uniform load, a point load, or both.
Section Properties and Stress
Section shape controls stiffness and stress. For a rectangular member, the second moment of area is b h cubed divided by twelve. A deeper member is much stiffer than a shallow member with similar area. Bending stress uses the peak moment, outer fiber distance, and section inertia. The comparison against yield strength produces a simple safety factor.
Deflection and Serviceability
Deflection matters because a member can be strong yet feel flexible. The calculator combines deflection from the uniform load and point load. It searches several positions along the span and reports the largest calculated movement. Compare that result with project limits, such as span divided by 360, before approving the member concept.
Axial Capacity and Buckling
Axial members require different checks. Tension and compression create normal stress from force divided by area. Elongation follows force times length divided by area times modulus. Compression members may buckle before reaching material yield. Euler buckling therefore uses effective length, modulus, area, and radius of gyration to estimate a critical load.
Units and Practical Limits
Use consistent units. Enter lengths in meters for spans, then dimensions in millimeters. Loads use kilonewtons or kilonewtons per meter. Material modulus is entered in gigapascals, while yield strength is entered in megapascals. The calculator converts units internally and labels each result clearly.
These outputs are screening values. Connection behavior, lateral restraint, vibration, local bearing, fire exposure, creep, load combinations, and code factors can change final requirements. Verify assumptions before construction. Record inputs with the CSV option, and print the results when project files need a concise calculation record.
Use the result panel during focused engineering conversations today. Share clear preliminary values with fabricators and reviewers. These checks reduce rework, improve material planning, and expose costly assumptions before decisions.
Frequently Asked Questions
1. What beam condition does the calculator use?
It uses a simply supported beam. The beam is supported at both ends, with no end fixity included. Use another method for cantilevers, continuous beams, or fixed-end members.
2. Can I enter both a uniform load and point load?
Yes. The calculator combines one uniform load and one point load by superposition. Set either load to zero when it does not apply.
3. Why does beam depth affect deflection strongly?
For a rectangular section, inertia depends on depth cubed. Increasing depth can substantially improve stiffness, often more effectively than increasing width alone.
4. Is the safety factor a code design check?
No. It is a simplified comparison of material strength or calculated capacity against the entered factored action. Code design may require different resistance factors, combinations, and limit states.
5. What is the default deflection limit?
The default is span divided by 360. Project requirements vary. Change the ratio to match the governing specification, finish sensitivity, occupancy, or equipment criteria.
6. How is maximum beam deflection located?
The calculator evaluates 601 locations across the span. It reports the greatest combined elastic deflection found in that numerical scan.
7. What does effective length factor K mean?
K represents end restraint and frame behavior for buckling. It changes the compression member’s effective unsupported length. Use a value justified by the actual boundary conditions.
8. Does the axial calculation include buckling in tension?
No. Tension members use yield capacity only in this tool. Euler buckling is relevant to compression members and is shown as a simplified screening value.
9. Can timber values be used directly?
Use the timber preset only for preliminary exploration. Timber design depends on species, grade, moisture, duration, orientation, notches, connections, and applicable adjustment factors.
10. Does the tool design connections?
No. Bolts, welds, plates, anchors, bearing, block shear, and connection eccentricity require separate calculations. Support conditions must also be realistic for the selected member model.
11. How should exported results be used?
Use CSV and printable output as a transparent record of preliminary inputs and results. Include units, assumptions, revision date, and independent engineering review in project documentation.