Static 2d body, force in member unknown

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Homework Help Overview

The discussion revolves around finding the stress or force in member AE of a static 2D body, with participants analyzing torque and forces acting on various members.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the calculations for moments about different points (B, C, D) and question the inclusion of reaction forces at points F and G. There is an exploration of how forces at G and F interact and cancel each other out in certain calculations.

Discussion Status

Some participants have offered insights regarding the need to consider reaction forces, while others are questioning the correctness of the original calculations and assumptions made in the problem setup. The discussion appears to be ongoing with multiple interpretations being explored.

Contextual Notes

There is mention of a solution from a book that provides a specific force value, but participants are trying to reconcile their calculations with this result, indicating potential discrepancies in their approach or assumptions.

togo
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Homework Statement


hvs48j.jpg


Find stress or force in member AE

Homework Equations


torque = force x distance


The Attempt at a Solution


Solution out of book is 142 kN

Attempts:
Mb = -(200kN)(2.5m) + (.895AE)(5) + 510
= 111 Kn

Mc = -(3m)(170kN) + (.895AE)(5)
= 114 kN

Md = (-80)(2.5) - (100kN)(7.5m) + (.895AE)(2.5)
= 424.60 kN

Solving for force at F and G, Fy = 80 kN and Gy = 130 kN

where did I go wrong?
 
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There are still reaction forces at F and G that you havn't took into consideration.
 
For B and C the forces at G and F are directly in line therefore they cancel out. In my calculation for D, I did take F into account
 
Any ideas
 

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