Force acting on steel rod (deformation)

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  • #1
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in this problem , i could only understand that P3 = 120KN , i cant understand why P2= -60kN and why P1 = 240kN ? can someone explain ?


Homework Equations




The Attempt at a Solution

 

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  • #2
Nidum
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In the same way that you can do a shear force diagram for lateral loads on a beam you can do a tension force diagram for axial loads on a shaft .

Basically plot a graph of axial tension against position along shaft . Have a try .
 
  • #3
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In the same way that you can do a shear force diagram for lateral loads on a beam you can do a tension force diagram for axial loads on a shaft .

Basically plot a graph of axial tension against position along shaft . Have a try .
What do you mean? can you explain further?
 
  • #4
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If you do a force balance on the entire rod, what do you get for the reaction force on the left end?
 
  • #5
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If you do a force balance on the entire rod, what do you get for the reaction force on the left end?
how to do it ? i know only the P3 .... which is 120kN , how to do for P1 and P2 ?
 

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  • #6
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how to do it ? i know only the P3 .... which is 120kN , how to do for P1 and P2 ?
You have 3 forces acting on the rod: 300 kN, 180 kN, and 120 kN. In order of the rod to be in static equilibrium, there must also be a force applied by the wall on the bar at location A. What does that force have to be?
 
  • #7
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You have 3 forces acting on the rod: 300 kN, 180 kN, and 120 kN. In order of the rod to be in static equilibrium, there must also be a force applied by the wall on the bar at location A. What does that force have to be?
what i found is this ? how to find the force applied by the wall on the bar at location A. ??
btw , i am not sure which 1 is P3 and which one is P2
 

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  • #8
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what i found is this ? how to find the force applied by the wall on the bar at location A. ??
btw , i am not sure which 1 is P3 and which one is P2
Forget about P1, P2, and P3 for now. Are you saying that you don't know how to do a 1 dimensional equilibrium force balance on a solid object?
 
  • #9
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Forget about P1, P2, and P3 for now. Are you saying that you don't know how to do a 1 dimensional equilibrium force balance on a solid object?
yes
 
  • #10
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Rod.PNG


F = 300 -180 + 120
 

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