Bending moments and points of contraflexure

In summary, the conversation is about a question on moments and beams that the person is attempting to solve. They have attached the question and their solutions so far, but are having trouble completing two parts. They are seeking help with determining bending moments and the point of contraflexure, and someone asks if they are familiar with the relationship between the bending moment and shear force.
  • #1
ai93
54
0
Hi
I am attempting a question on moments and beams.
I have attached the question and my solutions so far. But having trouble completing d) and e)
Can someone show how to work out bending moments and the point of contraflexure?
http://[ATTACH=full]199767[/ATTACH] [ATTACH=full]199768[/ATTACH]
[ATTACH=full]199769[/ATTACH]

any help is appreciated thanks
 

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  • #2
What have you done on part d so far. To you know how to determine the bending moment variation, given the shear force variation? How are the two related?

Chet
 
  • #3
Having trouble doing bending moments and points of contraflexture. That's why I need help!
 
  • #4

What is a bending moment?

A bending moment is a measure of the internal forces within a structural element, such as a beam or column, that results from an external load being applied. It is a combination of the external load and the distance from the load to a particular point on the structure.

How is a bending moment calculated?

A bending moment is calculated by multiplying the external load by the distance from the load to the point of interest. This calculation is often represented by the equation M = F * d, where M is the bending moment, F is the external force, and d is the distance from the load to the point of interest.

What is a point of contraflexure?

A point of contraflexure is a point along a structural element where the bending moment changes from positive to negative or vice versa. This point occurs where the curvature of the element changes direction.

How is a point of contraflexure identified?

A point of contraflexure can be identified by plotting the bending moment diagram of a structural element. It is represented by a point where the bending moment curve crosses the x-axis.

Why is understanding bending moments and points of contraflexure important in structural engineering?

Understanding bending moments and points of contraflexure is crucial in structural engineering because it allows engineers to design and analyze structures that can withstand the expected loads and forces. It also helps in determining the location and size of reinforcements needed to ensure the safety and stability of a structure.

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