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moments in beam

http://www.mathalino.com/reviewer/m...ution-to-problem-624-moment-diagrams-by-parts

First , 1st solution, the author taking moment about 2m from A? secondly, the 800Nm is clockwise moment, so it is positive? why the 2400Nm on the right(anticlockwise moment) is also positive?

i think the 2400Nm anticlockwise moment should be negative, which is located under the x-axis of graph , am i right?




in the second solution here, why the 400Nm is drawn from A to 2m away from A? why not the entire length of beam?
The 400nm act along the entire length of beam? Is it true?
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Avatar for wilson dang
wilson dang
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Original post by wilson dang
http://www.mathalino.com/reviewer/m...ution-to-problem-624-moment-diagrams-by-parts

First , 1st solution, the author taking moment about 2m from A? secondly, the 800Nm is clockwise moment, so it is positive? why the 2400Nm on the right(anticlockwise moment) is also positive?

i think the 2400Nm anticlockwise moment should be negative, which is located under the x-axis of graph , am i right?




in the second solution here, why the 400Nm is drawn from A to 2m away from A? why not the entire length of beam?
The 400nm act along the entire length of beam? Is it true?

Bump
Hi! I want to take a look but the link doesn't work.
Reply 3
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wilson dang
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Original post by aerofanatic
Hi! I want to take a look but the link doesn't work.

Here you go
http://www.mathalino.com/reviewer/mechanics-and-strength-of-materials/solution-to-problem-624-moment-diagrams-by-parts
To be honest I don't understand why subtraction is even involved in the three examples, e.g. for the first solution, all centroid locations are on the same side.
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wilson dang
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Can anybody help?

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wilson dang
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bump
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wilson dang
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bump
Reply 8
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pui95
hi I have a question of structural engineering can anyone help?
Original post by pui95
hi I have a question of structural engineering can anyone help?


I can try?

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