A) 2 points , at L/4 and 3L/4 from left support
B) 1 point , at L/2 from left support
C) 3 points , at L/3, L/2 and 2L/3 from left support
D) No point of contra flexure

Reference:
As per theory of structural analysis, in a fixed beam with a central point load, there are two points of contraflexure located at a distance of L/4 and 3L/4 from the left support, where L is the span.

fixed beam BMD
Image Source: testbook.com

This is because a fixed beam undergoes double curvature bending under a central point load. The bending moment diagram is symmetric about the centre and changes slope at L/4 and 3L/4 distances. These points of slope change are known as contraflexure points.

Therefore, option A is the correct answer.

See also  A round bar specimen is subjected to a tensile test. After fracture, it is observed that the diameter at the fractured section remains approximately the same as the original diameter. What material was the round bar most likely made of?

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N Lavanya

Lavanya is a passionate content writer about Structural Design, Grouting, Columns, Beams etc. She has 5 years of experience in teaching in Civil Engg. She enjoys writing complete guides and tips. Her passion is in building materials, construction standards, foundation design and building codes.

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