Influence Line Calculator | Structural Analysis & Beam Design
Calculate influence lines for beams, analyze structural responses to moving loads, and visualize shear/moment diagrams.
Beam Configuration
Comma-separated positions from left (m)
Point where effect is measured
Load Configuration
Influence Line Analysis Results
Beam Type: Simply Supported
Analysis: Shear Force
| Parameter | Value | Unit | Description |
|---|---|---|---|
| Maximum Positive Value | kN/kN or kN·m/kN | Maximum positive effect of unit load | |
| Maximum Negative Value | kN/kN or kN·m/kN | Maximum negative effect of unit load | |
| Critical Load Position | m | Position for maximum effect | |
| Zero Crossing Points | m | Positions where effect changes sign | |
| Actual Maximum Effect | kN or kN·m | Maximum effect with actual loads | |
| Actual Minimum Effect | kN or kN·m | Minimum effect with actual loads | |
| Deflection at Midspan | mm | Maximum deflection with actual loads |
Note: Influence lines show the variation of a specific force response (shear, moment, etc.)
at a specific point in a structure as a unit load moves across the structure.
Beam Visualization
Analysis Summary
0
Maximum Value
0
Minimum Value
-
Critical Position
-
Zero Points
Design Guidelines
- Maximum shear typically occurs near supports
- Maximum moment typically occurs at midspan or under concentrated loads
- Consider multiple load cases for moving load systems
- Check deflection limits (L/360 for floors, L/240 for roofs)