# Bending diagram, answers don't match book

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In summary, the conversation is discussing a homework problem involving the calculation of moment using the equation moment = force x distance. The book states that the maximum moment is 5.6 kN at a distance of 2.4 m from point A, but the person asking the question made a mistake in their calculation by using a moment arm of 4m instead of the correct value. The question also mentions a graph and a distributed load of 2 kN per meter.
togo

## Homework Equations

moment = force x distance

## The Attempt at a Solution

on sheet.

According to the book, the max moment is 5.6 kN (at a distance of 2.4 m from point A), which was my calculation before adding the force at A (.8 kN upward)

whats wrong?

When you summed moments about point A = 0, you calculated the moment of the distributed load as (8 kN)(4m) = 32 kN-m, but the moment arm (perpendicular distance) of the resultant of the distributed load is not 4m (the resultant of the distributed load acts at its center of gravity).

Could you post the original question? The general shape of your graph looks right, but I'm not certain what the value of that distributed load is suppose to be.

the value of the distributed load is 2 kN per meter

wow. You're right phantom, was a basic error on that one.

## 1. What is a bending diagram?

A bending diagram is a graphical representation of the internal bending moments and shear forces in a structural element, such as a beam or column. It shows how these forces vary along the length of the element and is used to analyze the structural stability and strength.

## 2. How do you create a bending diagram?

To create a bending diagram, you first need to determine the external loads and support reactions acting on the structural element. Then, using equations of equilibrium and bending theory, you can calculate the internal forces at various points along the element. Finally, these values are plotted on a graph to create the bending diagram.

## 3. Why are the answers in my bending diagram not matching with the textbook?

There could be several reasons for this discrepancy. It is possible that there was an error in your calculations or in the textbook. Double-check your work and make sure you are using the correct equations and assumptions. It is also possible that the structural element in the textbook example is different from the one you are analyzing, leading to different results.

## 4. Can a bending diagram be used for all types of structural elements?

No, a bending diagram is primarily used for analyzing beams and columns. Other types of structural elements, such as trusses or frames, require different methods of analysis.

## 5. How is a bending diagram useful in engineering?

A bending diagram is useful for engineers because it allows them to visualize and understand the internal forces acting on a structural element. This information is crucial for designing safe and efficient structures, as well as identifying potential problem areas that may need reinforcement or modification.

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