Does Angling a pin support on a truss change anything?

In summary, the pin on a 30 degree incline would not change the supporting reactions because it still supports a horizontal and vertical.
  • #1
CallumTheMan
5
0

Homework Statement


If you had a simple 2D truss with a pin and a roller support, would making the pin on a 30 degree incline change the supporting reactions?

Homework Equations

The Attempt at a Solution


Can't see why since it still supports a horizontal and vertical, don't know hwy the angle would change anything?
 
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  • #2
How did you determine that it does not change anything? Did you draw a diagram and work out the forces and stresses?
How are is the pin usually angled IRL - did you have a look?
 
  • #3
Simon Bridge said:
How did you determine that it does not change anything? Did you draw a diagram and work out the forces and stresses?
How are is the pin usually angled IRL - did you have a look?
Okay so, imagine a basic truss that has a roller on the left side and a pin on the right. The pin on the right it angled at 30 degrees so instead of it sitting under the end perpendicular to the truss, its tilted by 30 degrees. Does tilting the support change the external reactions?
 
  • #4
See attached
 

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  • #5
CallumTheMan said:
Okay so, imagine a basic truss that has a roller on the left side and a pin on the right. The pin on the right it angled at 30 degrees so instead of it sitting under the end perpendicular to the truss, its tilted by 30 degrees. Does tilting the support change the external reactions?
It depends.

Are you more concerned with the reactions in the pin itself, or are you concerned with the forces at the base of the pin holder?
 
  • #6
SteamKing said:
It depends.

Are you more concerned with the reactions in the pin itself, or are you concerned with the forces at the base of the pin holder?

Yeah I am concerned with just the external reactions of the pin support. Like in that picture I added, would tilting the support 30 degrees underneath the truss create a horizontal reaction? or would it still be 0 because there is no horizontal load?

PS. there are point loads on the truss at joints but none at the pin support and none are angled or horizontal
 
  • #7
As always, if you want to know what is going on in the pin and its foundation, make a free body diagram and analyze it.
 
  • #8
Can you please demonstrate how to draw the free body diagram start from the 30 degrees angled pin support? Let's say we put an external load 15kN pointing downward at top left corner of the truss. How to find the reaction forces at both roller and pin support? Do we consider the actual 2 reaction forces of the pin support as resultant force and both of them have their own horizontal and vertical forces?
 

1. What is angling a pin support on a truss?

Angling a pin support on a truss refers to changing the angle at which a pin is attached to a truss structure. This can affect the overall stability and load-bearing capacity of the truss.

2. Why would someone angle a pin support on a truss?

Angling a pin support on a truss is often done to distribute the load more evenly across the truss, or to accommodate for uneven weight distribution on the structure. This can help prevent overloading or uneven stress on the truss.

3. Does angling a pin support on a truss change the structural integrity?

Yes, angling a pin support on a truss can change the structural integrity of the truss. The change in angle can affect the distribution of forces and may require additional support or reinforcement to maintain the stability of the truss.

4. How does angling a pin support on a truss affect the overall strength?

Angling a pin support on a truss can either increase or decrease the overall strength, depending on the specific angle and placement of the pin. In some cases, angling a pin support may help evenly distribute weight and strengthen the truss, while in other cases it may create weak points or uneven stress on the structure.

5. Are there any safety concerns with angling a pin support on a truss?

Yes, there can be safety concerns with angling a pin support on a truss. It is important to carefully calculate and consider the effects of angling a pin support on the structural integrity and load-bearing capacity of the truss. Improper angling or inadequate reinforcement can potentially lead to structural failure and pose a safety hazard.

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