Beam Analyzer by HimelSFD · BMD · AFD · Deflection

Beam model

Direct-stiffness analysis with true internal-hinge releases.

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Beam properties

#Length (m)E (GPa)I (mm⁴)

Supports

#TypePositionSettlement (mm)

Loads

#TypeValue (kN)Value 2 (UDL)Angle (°)Position / FromTo (UDL)

For UDL, use Value 2 to define the intensity at the far end. Equal values produce a rectangular UDL; unequal values produce a trapezoidal or triangular load shape.

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Results

Waiting
Max |V|——
Max |M|——
Max |δ|——
Max |N|—AFD not modeled yet

Support reactions

Evaluate the beam to see reactions.

Internal-hinge checks

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Diagrams

Shear Force Diagram (SFD)

Bending Moment Diagram (BMD)

Deflection Diagram

Rotation / Slope (RAD)

Free Online Beam Calculator

BeamLab is a free online structural beam calculator for analyzing beams and visualizing shear force diagrams (SFD), bending moment diagrams (BMD), beam deflection, rotation and support reactions. Define spans, supports and loads, then evaluate the beam to see the calculated results and diagrams.

Shear Force Diagram (SFD) Calculator

Use BeamLab to calculate and visualize shear force along a beam under point loads, uniformly distributed loads and other supported loading conditions. The results help identify changes in shear and critical sections.

Bending Moment Diagram (BMD) Calculator

BeamLab calculates bending moment along the beam and plots the BMD so you can inspect maximum bending moments and points of contraflexure. The analysis also reports the bending moment at critical sections identified from the shear-force behavior.

Beam Deflection Calculator

The calculator evaluates beam deflection and rotation using the beam properties and loading defined in the model. Results include the maximum deflection and its position.

Beam supports and loading

BeamLab can be used for common beam arrangements including simply supported beams and cantilevers, with supports and loads placed at user-defined positions. Point loads, distributed loads and applied moments can be included in the model.

Frequently Asked Questions

What is an SFD?

A shear force diagram shows how internal shear force varies along the length of a beam. It is commonly used with the bending moment diagram to understand the internal actions produced by the applied loads and supports.

What is a BMD?

A bending moment diagram shows how the internal bending moment varies along a beam. Locations where the bending moment changes sign are known as points of contraflexure.

What is a dangerous section of a beam?

A dangerous section is a section where the bending moment reaches a critical value, typically identified at a location where the shear force changes sign from positive to negative or negative to positive.

Can BeamLab analyze a simply supported beam?

Yes. BeamLab supports simply supported beam arrangements and allows loads such as point loads and distributed loads to be defined along the beam.

Can BeamLab calculate beam deflection?

Yes. BeamLab provides calculated deflection and rotation results together with the beam's shear-force and bending-moment diagrams.