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 B at 9 m. 12 m beam — pin A at 0 m, roller B at 9 m.

AB0L=12m
-1-0.500.511.5A (0)4.5 (4.5m)B (9m)LA (0)4.5BLI.L. for Rᴮ — Reaction at B

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