How Do You Calculate the Moment to Relieve Load on Roller A in a Beam System?

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SUMMARY

The discussion focuses on calculating the moment (M) required to relieve load on roller A in a beam system, specifically addressing a uniform beam with a mass of 550 kg. Participants suggest constructing a Free Body Diagram (FBD) and recommend taking moments about point B to simplify the calculation, as this allows the reaction at B to be ignored. The conversation highlights the need for foundational mechanics knowledge, particularly for those preparing for future coursework in mechanics.

PREREQUISITES
  • Understanding of Free Body Diagrams (FBD)
  • Basic principles of static equilibrium
  • Knowledge of moment calculations in beam systems
  • Familiarity with converting mass to weight (e.g., kg to kN)
NEXT STEPS
  • Study the principles of static equilibrium in mechanics
  • Learn how to construct and analyze Free Body Diagrams (FBD)
  • Research moment calculations in beam systems
  • Explore examples of load distribution and reactions in structural analysis
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Engineering students, particularly those studying mechanics or structural analysis, as well as professionals involved in civil or mechanical engineering who require a solid understanding of load calculations in beam systems.

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The problem states: Construct a FBD of the system shown in 7.38(which i have attached). The beam is uniform and has a mass of 550 kg(I converted it to kN). Determine the moment M that will relieve roller A of any load. At this condition determine the resultant pin reaction at B.

This is not a mechanics class(so I have no background)but our instructor was just getting us started for next semester mechanics that he teaches. The book has few examples and not an example of this type. How would I determine the moment? Any help to get me started would be great. Thanks
 

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ur5pointos2sl said:
The problem states: Construct a FBD of the system shown in 7.38(which i have attached). The beam is uniform and has a mass of 550 kg(I converted it to kN). Determine the moment M that will relieve roller A of any load. At this condition determine the resultant pin reaction at B.

Hi ur5pointos2sl! :smile:

I can't see the picture yet,

but my guess is that you should find M by taking moments about B

(because then the reaction at B can be ignored :wink:)
 

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