The influence line for the structural function is used for obtaining maximum value because of:

A. Uniformly distributed load 

B. Single point load

C. Series of concentrated load.

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  1. Only A
  2. B and C
  3. A, B and C
  4. A and B

Answer (Detailed Solution Below)

Option 3 : A, B and C
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Concept:

Influence Line Diagram:

1. It is a graph representing the variation of internal force (reaction, shear, moment) at a specific point of the member, due to a unit point load moving on the structure.
2. It can be used for the analysis of:

  • Any type of structure (i.e. Determinate or Indeterminate)
  • Any Type of Loading (i.e. Point Load, UDL, UVL, Series of point load, etc)


3. Analysis of structure means:

  • Calculating maximum internal forces (i.e. reactions, shear force, bending moment, etc) at a particular section
  • Calculating location of load which will cause maximum internal forces.


Explanation:

Hence, the Influence line diagram for the structural function (i.e. reaction, shear force, or bending moment) can be used for obtaining maximum values because of any type of loading.

The following are the points that should be kept in mind:

  • ILD for a determinate structure is always linear while for indeterminate is curvilinear.
  • Ordinate for ILD of shear force and reactions is dimensionless while for bending moment it is having a unit of length.
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