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ByN Lavanya Posted on

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.

N Lavanya

N. Lavanya is a sincere and honest civil engineering writer for civilenggblitz.com, known for her clear, practical articles that help learners and professionals alike. She has 5 years of teaching experience in civil engineering, which strongly influences her structured, easy-to-follow writing style. Her primary interests include structural design, grouting, columns, beams, and related structural components, and she particularly enjoys creating complete guides and actionable tips on these topics.

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