Forces in truss members greater than applied force?

In summary, when conducting experiments with strain gauges attached to each member, it is common for individual member forces to exceed the applied loads in certain directions. This is because the applied force is not always in the same direction as the member forces, making it necessary for the member forces to be larger in order to exert a vertical component equal to the applied force.
  • #1
sukibelle
10
0
I've had to conduct an experiment with strain gauges attached to each member and when I've calculated the forces in the members I've come out with really large forces in comparison to the applied force.. how does this work out?
 
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  • #2
Yes that quite often happens that individual member forces exceed applied loads in certain directions.


In fact if you think about it, it sometimes becomes inevitable.

Consider the simple hanger shown in the attachment.

T is the only vertical force supporting weight W. But T is not vertical so must be greater than W to exert a vertcal component equal to W.

go well
 

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  • #3
Igetit! thanks for the amazing explanation :)
 

FAQ: Forces in truss members greater than applied force?

1. What are forces in truss members greater than the applied force?

The forces in truss members greater than the applied force refer to the internal forces that occur within the members of a truss structure when the external applied force exceeds the capacity of the truss to support it.

2. How do these forces affect the stability of a truss structure?

When the forces in truss members are greater than the applied force, it can lead to structural instability and potential failure. The excess forces can cause the truss to bend or buckle, compromising its ability to support the load.

3. What factors can cause forces in truss members to exceed the applied force?

The main factor that can cause forces in truss members to exceed the applied force is overloading. This can happen due to a miscalculation of the load or unexpected external forces such as strong winds or seismic activity. In addition, poor construction or material defects can also contribute to this issue.

4. How can engineers prevent forces in truss members from exceeding the applied force?

To prevent forces in truss members from exceeding the applied force, engineers can use appropriate design and construction techniques. This includes accurately calculating the expected load, using high-quality materials, and ensuring the truss structure is properly braced and supported. Regular inspections and maintenance can also help identify and address any potential issues before they become a problem.

5. What are the consequences if forces in truss members exceed the applied force?

If the forces in truss members exceed the applied force, it can result in structural failure, which can have serious consequences. This can include damage to property, injuries, and even loss of life. It can also lead to costly repairs and potential legal liabilities. Therefore, it is crucial for engineers to carefully consider and account for all potential forces in truss design to prevent such scenarios from occurring.

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