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A point, along the length of a beam subjected to loads, where bending moment changes its sign, is known as the point of
- a)Inflexion
- b)Maximum stress
- c)Zero shear force
- d)Contra flexure
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A point, along the length of a beam subjected to loads, where bending ...
Point of Contraflexure in a Beam
When a beam is subjected to transverse loads, it experiences bending moment and shear force. The bending moment is the algebraic sum of moments on either side of a section, while shear force is the algebraic sum of the forces on either side of the section. The distribution of bending moment and shear force along the beam depends on the type of loading, boundary conditions, and cross-sectional shape of the beam.
One of the important concepts in the analysis of beams is the point of contraflexure, which is defined as the point along the length of the beam where the bending moment changes its sign. At this point, the moment changes from positive (tending to cause sagging) to negative (tending to cause hogging), or vice versa. The term "contraflexure" means the opposite of flexure or bending, and indicates a change in the curvature of the beam.
The point of contraflexure can be identified by plotting the bending moment diagram for the beam, which shows the variation of bending moment with distance. The point of contraflexure is the point where the bending moment curve intersects the horizontal axis, i.e., the moment is zero. At this point, the curvature of the beam changes its direction, and the deflection of the beam also changes its sign.
Significance of Point of Contraflexure
The point of contraflexure has several implications for the behavior and design of beams, such as:
- It indicates the location where the maximum deflection occurs, as the curvature changes its sign.
- It affects the distribution of shear force along the beam, as the shear force is zero at the point of contraflexure.
- It can affect the design of supports and connections, as the change in curvature can cause stress concentrations and deformation.
- It is a critical factor in the analysis of beam stability, as the point of contraflexure can determine the mode of failure and collapse.
Therefore, the point of contraflexure is an important concept in the mechanics of materials and structural engineering, and should be carefully considered in the design and analysis of beams.
When a beam is subjected to transverse loads, it experiences bending moment and shear force. The bending moment is the algebraic sum of moments on either side of a section, while shear force is the algebraic sum of the forces on either side of the section. The distribution of bending moment and shear force along the beam depends on the type of loading, boundary conditions, and cross-sectional shape of the beam.
One of the important concepts in the analysis of beams is the point of contraflexure, which is defined as the point along the length of the beam where the bending moment changes its sign. At this point, the moment changes from positive (tending to cause sagging) to negative (tending to cause hogging), or vice versa. The term "contraflexure" means the opposite of flexure or bending, and indicates a change in the curvature of the beam.
The point of contraflexure can be identified by plotting the bending moment diagram for the beam, which shows the variation of bending moment with distance. The point of contraflexure is the point where the bending moment curve intersects the horizontal axis, i.e., the moment is zero. At this point, the curvature of the beam changes its direction, and the deflection of the beam also changes its sign.
Significance of Point of Contraflexure
The point of contraflexure has several implications for the behavior and design of beams, such as:
- It indicates the location where the maximum deflection occurs, as the curvature changes its sign.
- It affects the distribution of shear force along the beam, as the shear force is zero at the point of contraflexure.
- It can affect the design of supports and connections, as the change in curvature can cause stress concentrations and deformation.
- It is a critical factor in the analysis of beam stability, as the point of contraflexure can determine the mode of failure and collapse.
Therefore, the point of contraflexure is an important concept in the mechanics of materials and structural engineering, and should be carefully considered in the design and analysis of beams.
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A point, along the length of a beam subjected to loads, where bending ...
The point along a beam where the bending moment changes sign is known as the point of contra flexure. At this point:
- The bending moment is zero.
- The beam changes from sagging to hogging or vice versa.
- It is significant in structural analysis for determining stress distribution.
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A point, along the length of a beam subjected to loads, where bending moment changes its sign, is known as the point ofa)Inflexionb)Maximum stressc)Zero shear forced)Contra flexureCorrect answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about A point, along the length of a beam subjected to loads, where bending moment changes its sign, is known as the point ofa)Inflexionb)Maximum stressc)Zero shear forced)Contra flexureCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A point, along the length of a beam subjected to loads, where bending moment changes its sign, is known as the point ofa)Inflexionb)Maximum stressc)Zero shear forced)Contra flexureCorrect answer is option 'D'. Can you explain this answer?.
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