Civil Engineering MCQJE Level Civil Engineering
The influence line ordinate for the reaction RA at support A of a simply supported beam AB at a distance x from A (load at x) is:
Strength of MaterialsStrength of MaterialsMEDIUM
Choose the correct answer
A
RA = x/L
B
RA = (L−x)/L
C
RA = 1 always
D
RA = x(L−x)/L
Correct Answer
B. RA = (L−x)/L
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For unit load at distance x from A (span L): RA = (L−x)/L (by moments about B). The IL for RA is a straight line: 1.0 at A, 0 at B. IL for RB is (L−x)/L measured from B. ILs are used to find the worst load position (max effect when load placed at IL ordinates of same sign).
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