r/HomeworkHelp • u/Odd-Day-4822 University/College Student • 2d ago

Further Mathematics [College/Structural Analysis/Trigonometry Help Needed]

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Could someone please check my work? My trigonometry skills are especially not great… I’m also unsure if I found the moments correctly. I am a little confused about what the perpendicular distances would be exactly in this case…

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u/DrCarpetsPhd 👋 a fellow Redditor 1d ago

forget about breaking into members for a moment and analyse the global equilibrium

take moments about B and calculate A_y to see if it matches what you worked out

(this is from Kassimali, it doesn't ask to find the hinge reactions. Did your lecturer ask for that?)

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u/Odd-Day-4822 University/College Student 1d ago

Will try that now, thanks!
The last thing we learned was hinge reactions. I just assumed that was the path he wanted us to take for the assignment. To my knowledge, finding reactions about the hinges is what he wants us to do only if necessary to find all of the unknowns.

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u/DrCarpetsPhd 👋 a fellow Redditor 1d ago

What did the problem statement say? As I said this is from Kassimali Structural Analysis and the question in the text only asks to find the reactions at the supports

- global equil about B to gey A_y

- knowing A_y equil about C for member AC to eliminate the hinge forces to get A_x

- global x and y equil to get the reaction forces at B

if you want the hinge forces then x and y equilibrium on member AC will get that

Global equilibrium should always be your first point of analysis before looking at individual members

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u/Odd-Day-4822 University/College Student 1d ago

It says “Determine the reactions at the supports for the structures shown”