What is use of ILD diagram at site?
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ILD or Influence Line Diagram shows us the effect of a point load at some point on a structural member with respect to the position of the load.
So, ILD tells us what and where would be the maximum effect of a load places at what location. So to visualize the worst-case scenario and best-case scenario and the variations I between, ILD is a comprehensive aid.
The most common usage is in Bridges, rail tracks, and roads where loads are always pointed loads (axle loads) and always moving. Knowing when and how much will be the maximum effect like bending moment, shear force, etc. helps us set up the design values.