determination of soundboard flexural rigidity

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benvaneven
Gidgee
Posts: 9
Joined: Sun Apr 30, 2017 6:10 pm

determination of soundboard flexural rigidity

Post by benvaneven » Wed Sep 12, 2018 4:08 am

I am reading the sections 4.4 design of braces and 4.5 design plates.
My calculations for plate thickness were successful. Now I am trying to determine the soundboard flexural rigidity.
I don’t see how to calculate the neutral axis of the soundboard cross section in fig. 4.4-19.
I understand what is written on page 4-37.
For calculating the x for the soundboard cross section do I have to take the area of the soundbourd, 2 triangels (triangle braces), 2 triangles (gabled braces) and 2 rectangles (gabled braces)?
Thanks, Ben

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Trevor Gore
Blackwood
Posts: 1365
Joined: Mon Jun 20, 2011 8:11 pm

Re: determination of soundboard flexural rigidity

Post by Trevor Gore » Thu Sep 13, 2018 12:49 am

benvaneven wrote:
Wed Sep 12, 2018 4:08 am
I don’t see how to calculate the neutral axis of the soundboard cross section in fig. 4.4-19.
Take the moments of all the component areas about the base, setting up a large equation similar to the penultimate one on p 4-37.
benvaneven wrote:
Wed Sep 12, 2018 4:08 am
For calculating the x for the soundboard cross section do I have to take the area of the soundbourd, 2 triangels (triangle braces), 2 triangles (gabled braces) and 2 rectangles (gabled braces)?
Yes.

benvaneven
Gidgee
Posts: 9
Joined: Sun Apr 30, 2017 6:10 pm

Re: determination of soundboard flexural rigidity

Post by benvaneven » Thu Sep 13, 2018 1:56 am

thanks a lot for your answer!

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