Find Reactions of 4000lb Crate in Truss Figure 1

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SUMMARY

The discussion focuses on calculating the reactions at points A and E of a truss supporting a 4000lb uniformly weighted crate. The participant correctly identifies the use of the moment arm equation, M = F * Distance, to determine forces. It is clarified that joints B, D, and C do not have reactions, as they are not supports, and that the forces at these joints must sum to zero. The participant concludes that they can now compute the moment at A using the forces from joints B, D, and C.

PREREQUISITES
  • Understanding of static equilibrium principles
  • Familiarity with truss analysis techniques
  • Knowledge of moment arm calculations
  • Basic concepts of force resolution in two dimensions
NEXT STEPS
  • Study static equilibrium in trusses using the method of joints
  • Learn about calculating internal forces in truss members
  • Explore advanced applications of the moment arm equation in structural analysis
  • Investigate the effects of different loading conditions on truss reactions
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Students in structural engineering, civil engineering professionals, and anyone involved in analyzing truss systems and static load calculations.

kennyvs
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Homework Statement


A 4000lb uniformly weighted crate is attached by light inextensible cables to the trus show below. Simply determine the reaction at A and E of the truss show below

Figure 1 attachment

Homework Equations


I used the Moment arm equation of M = F*Distance

The Attempt at a Solution



I know how to find out the Fx and Fy force of A and E, but I am having trouble determine the Fx and Fy force of B D C
 

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Last edited:
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Hi, kennyvs, welcome to PF!
The problem asks you to determine the reactions at A and E, which you know how to find. There are no supports at B, D, and E, therefore, there are no reactions at those joints. Are you trying to take this problem one step further by determining the member forces? Each of the joint forces must sum to 0. For example, at joint D, the cable exerts a 2000 pound downward pull on the joint, so the member BD must exert an upward pull of 2000 pounds on that joint. But I'm not sure what you are trying to do.
 
I think i got what i need to complete the assignment. Initially I don't know what the force at B D C are, but knowthnx to your reply ^^ now i can find moment A with the force from joint B, D, C. Thnx
 

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