Civil Engineering MCQAE Level Civil Engineering
The influence line diagram for the vertical reaction R_A at the left support of a simply supported beam AB of span L has:
Structural AnalysisILD Reaction at AMEDIUM
Choose the correct answer
A
A triangle with ordinate 1 at A and 0 at B
B
A rectangle of height 1 over the full span
C
A parabola with maximum at midspan
D
A triangle with ordinate 1 at B and 0 at A
Correct Answer
A. A triangle with ordinate 1 at A and 0 at B
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R_A = (L-x)/L when unit load is at distance x from A. At x=0 (load at A): R_A=1; at x=L (load at B): R_A=0. ILD is a straight line (triangle) from 1 at A to 0 at B.
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