Enquiry: Bending not along principle axis?

In summary, the conversation discusses the validity of the equation for stress in a short beam and its relation to the principle axis. It also mentions a method for calculating bolt connections in steel design when the principle axis is unknown.
  • #1
Su Solberg
75
0
Hi, everyone.

I was told that when a beam is short, L<=5H, the equation of "Stres=Moment*/2nd moment of initeria" is not valid (how).
(where H = deapth of beam ; L is the location of F acting on that beam)

Is that ture and is that relate to principle axis?

Also if it is ture, why people use the following kind of calculation for Bolt Connection in steel design.


Thanks alots of your advise in advance.
 
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  • #2
Sorry, attachment missing.
The following is the method of calculation in Steel Design.

Assuming principle axis is unknown. find the principle axis by try and error in the equation of Sum of Torque by Tension +bearing = moment encounter in the connection group.
 

Attachments

  • Bolt Connection Calculation.PNG
    Bolt Connection Calculation.PNG
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1. What is bending not along principle axis?

Bending not along principle axis refers to the bending of a material in a direction that is not parallel to its principle axis. This means that the force being applied to the material is not acting in a way that is aligned with the strongest or most rigid direction of the material.

2. How does bending not along principle axis affect the material?

Bending not along principle axis can cause the material to experience different levels of stress and strain, potentially leading to structural failures or changes in its mechanical properties. It can also result in the development of new cracks or weaknesses in the material.

3. What are some common causes of bending not along principle axis?

Some common causes of bending not along principle axis include uneven or asymmetrical loading, structural defects or imperfections in the material, and misalignment during construction or installation.

4. How can bending not along principle axis be prevented or minimized?

To prevent or minimize bending not along principle axis, it is important to carefully consider the design and construction of a structure or material. This may involve using stronger or more rigid materials, ensuring even distribution of forces, and properly aligning components during assembly.

5. What are some real-world examples of bending not along principle axis?

Examples of bending not along principle axis can be seen in buildings or bridges that experience uneven or unbalanced loading, resulting in structural failures. It can also occur in materials used in manufacturing, such as pipes or beams, when they are not properly aligned or supported during installation.

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