How to Calculate Forces in a Beam Using the Method of Sections

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Discussion Overview

The discussion focuses on calculating forces in a beam using the method of sections, specifically addressing a problem related to determining the force in a member of a truss structure. The scope includes technical reasoning and mathematical calculations.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Homework-related

Main Points Raised

  • One participant describes their approach to calculating the force in member BC by taking moments at point A, but expresses uncertainty about the correctness of their calculations.
  • The same participant mentions specific values and angles in their calculations, indicating a potential oversight or misunderstanding.
  • Another participant questions the angle used in the calculations, suggesting a need to verify the geometry of the triangles involved.

Areas of Agreement / Disagreement

The discussion remains unresolved, with participants expressing differing views on the correctness of the angle used and the calculations performed.

Contextual Notes

Limitations include potential missing assumptions regarding the geometry of the truss and the accuracy of the angles used in the calculations.

Arty7
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IHi guys with part b of this question I am having trouble. I have cut it it at the specified members and used the top half. Now i take the moment at A to get the force in BC. (CW+)M@A=(6*3)+(6cos(30)*3)=0, But when you solve this it doesn't give you the answer its supposed to be, I am probably blind & missing something. Please check out the attachments i provided some more info on it.

Thankyou in Advance.
 

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Sorry man, its up now
 
Where do you get 30 degrees from? Check your triangles.
 

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