What Is the Maximum Mass That Keeps Truss Forces Within Limits?

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Homework Help Overview

The problem involves determining the maximum mass of a suspended block in a truss system, ensuring that the forces in any member do not exceed specified limits. The subject area pertains to statics and structural analysis.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to clarify their assumptions regarding the forces and considers summing moments to find the mass. Some participants express frustration with the lack of examples and explanations in their reference materials, questioning the adequacy of their textbooks and instructional support.

Discussion Status

The discussion reflects a range of interpretations and approaches, with participants exploring different aspects of the problem. There is acknowledgment of the challenges posed by the educational materials, and some guidance is sought regarding the analysis of specific joints in the truss.

Contextual Notes

Participants note constraints related to the educational resources available, including insufficient examples in textbooks and the complexity of problems presented by the instructor. There is also mention of specific angles and configurations in the truss that may affect the analysis.

JJRKnights
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Homework Statement


24zvji1.jpg

Determine the largest mass m of the suspended block so that the force in any member does not exceed 52 kN(T) or 47 kN(C).

Homework Equations


ƩM = 0
ƩFy = 0
ƩFx=0

The Attempt at a Solution


6gfsip.png

Did I assume the arrows right?

Would this be the right track to solving this?
Solve for each piece.
Sum of moments, and solve for m?
 
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Using Hibbeler as my book, no relevant examples in the book(as always), not enough explanation to solve the questions(as always). All the physics books I've ever encountered are so incomplete that I'm surprised they get published. If I never did physics, picked up one of these books and tried to learn it from the start, I'd probably get stuck in the first chapters because of the lack of explanation. My professor is even worse, let's give extremely easy examples, but when it comes to problems let's make them extremely hard.
 
All the back of the book says is:

Joint D: (F_DC)sin45 + (F_DE)cos30.25 - W = 0
Joint A: F_AG - 1.414Wsin45 = 0

Thanks for the detail Hibbeler.
 
JJRKnights said:
Using Hibbeler as my book, no relevant examples in the book(as always), not enough explanation to solve the questions(as always). All the physics books I've ever encountered are so incomplete that I'm surprised they get published. If I never did physics, picked up one of these books and tried to learn it from the start, I'd probably get stuck in the first chapters because of the lack of explanation. My professor is even worse, let's give extremely easy examples, but when it comes to problems let's make them extremely hard.

If points E and C were attached/hinged to a wall, could you analyse CD and ED.
The scale of the diagram will show you how far apart E and C are - there is a 45o angle in there.
 
Solved it
 

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