Australian Beam Design Calculator – Free Online Beam Load, Shear & Bending Moment Calculator
The Australian Beam Design Calculator is a simple and easy-to-use online engineering tool that helps engineers, students, designers, and contractors quickly determine the primary actions on a simply supported beam subjected to a uniformly distributed load (UDL).
Simply enter the beam span, dead load, and live load, and the calculator instantly determines the ultimate design load, support reactions, maximum bending moment, and maximum shear force. Results are updated automatically as values are entered, eliminating the need for a separate Calculate button.
Beam Actions & Reinforcement Calculator
Simply supported reinforced-concrete beam under uniformly distributed gravity loads.
AS/NZS 1170.0:2002 · AS 3600:2018 · Preliminary DesignBeam Inputs
ULS gravity combinations: 1.35G and 1.2G + 1.5Q. Shear, deflection, durability, cover, development and detailing require separate engineer checks.
Live Results
Detailed Calculation
| Step | Calculation | Result |
|---|---|---|
| Self-weight | 25 × b × D | |
| Permanent action | G = self-weight + dead load | |
| Ultimate UDL | max(1.35G, 1.2G + 1.5Q) | |
| Reaction / shear | w*L / 2 | |
| Maximum moment | w*L² / 8 |
Reinforcement Design
| Effective depth | |
| Stress-block factors | |
| Required tension steel | |
| Minimum strength |
Suggested bars: —
Codal References
AS/NZS 1170.0:2002 Clause 4.2.2: ultimate-limit-state action combinations.
AS 3600:2018 Table 2.2.2(b), Clauses 8.1.2, 8.1.5, 8.1.6.1: flexural reduction factor, rectangular stress block, bending capacity and minimum strength.
Educational preliminary-design calculator. Final design must be verified by a qualified Australian structural engineer.
Features
- Automatic live calculations
- Ultimate load calculation
- Support reaction calculation
- Maximum bending moment calculation
- Maximum shear force calculation
- Detailed step-by-step calculations
- Responsive design for desktop and mobile devices
- Suitable for engineering blogs and educational use
Calculator Inputs
- Beam Width (mm)
- Beam Depth (mm)
- Span Length (m)
- Dead Load (kN/m)
- Live Load (kN/m)
Calculator Outputs
- Ultimate Design Load
- Left Support Reaction
- Right Support Reaction
- Maximum Bending Moment
- Maximum Shear Force
- Step-by-Step Calculation Details
Calculation Equations
Ultimate Load
wu = 1.2 × Dead Load + 1.5 × Live Load
Support Reaction
Reaction = wu × L ÷ 2
Maximum Bending Moment
M = wu × L² ÷ 8
Maximum Shear Force
V = wu × L ÷ 2
These equations apply to a simply supported beam carrying a uniformly distributed load (UDL) and are widely used for preliminary structural analysis and educational purposes.
Applications
This calculator can be used for:
- Residential building beams
- Commercial building beams
- Reinforced concrete beams
- Steel beams
- Educational structural analysis
- Preliminary beam sizing
- Civil engineering assignments
- Structural engineering calculations
Disclaimer
This calculator is intended for preliminary structural analysis and educational purposes only. It calculates beam actions such as load, reactions, bending moment, and shear force. Final structural member design, reinforcement detailing, and code compliance should be completed by a qualified structural engineer using the applicable design standards and project-specific requirements.
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