Lab / Structural Analysis

Influence Line

Draw and verify ILs for reaction, shear and moment — quiz yourself or build any determinate beam and generate the exact diagram.

Learn what ILs are →

Task: Draw the I.L. for reaction at roller D at 10 m. 10 m Gerber beam — pin A at 0, hinge F at 2 m, roller B at 0 m, roller C at 6.5 m, hinge G at 8 m, roller D at 10 m.

ABFCGD
-1-0.75-0.5-0.2500.250.50.7511.25AF (2m)B (3.5m)C (6.5m)G (8m)DAFBCGDI.L. for Rᴰ — Reaction at D (roller)

Drag the handles up / down to set your influence-line values, then check your answer.