Reactions in the mechanic construction

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SUMMARY

The discussion focuses on calculating reactions in a mechanical construction involving specific dimensions and forces. The key parameters include L1 = 7.1m, L2 = 1m, L3 = 0.2m, a force F = 2.8 kN, torque M = 1.3 kNm, and a distributed load p = 2.5 kN/m. A critical error identified was the incorrect lever arm used for the distributed load p, which should be L1 + L2/2. The correction of this mistake is essential for accurate reaction calculations.

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  • Understanding of static equilibrium in mechanics
  • Knowledge of calculating moments and forces in mechanical systems
  • Familiarity with distributed loads and their effects on structures
  • Ability to interpret mechanical diagrams and schematics
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Mechanical engineers, civil engineers, and students studying structural mechanics will benefit from this discussion, particularly those involved in calculating reactions and forces in mechanical constructions.

Andreii
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Hi

I am trying to figure out reactions in the mechanic construction which is here http://img.photobucket.com/albums/v309/Andreii/nalogca.jpg" .
Datas of construction are:

L1 = 7.1m
L2 = 1m
L3 = 0.2m
F = 2.8 kN = 2800N
M = 1.3 kNm = 1300Nm (this is torque)
p = 2.5 kN/m = 2500 N/m

p is showed as a mass on the mechanic construction. As is showed on the picture, on the left part is 10p and on the right is 1p.
I would like to do on the same way as i have tried and not on any other one. With fields, I mean that I am cutting the construction on three different parts (look on the second and third link at the picture). N means interior axis force, M is torque (moment) and T is diagonal force.
I checked several times my steps and I don't know why I don't get the correct result. Something is wrong in those reactions (setting them up) but not sure what. If someone could take time to check my steps please... and thank you for any information

Andreii
 
Last edited by a moderator:
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In your moment with respect to support A, the p lever arm is wrong. It should be L1 + L2/2.
 
Cyclovenom I checked and this was mistake. Thank you, now i will know what is correct, so i won't do the same mistake again.

Thank you
 

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