Solving equation for I

1. Oct 4, 2013

Hello there,

I need some help rearranging a combination of equations and was wondering if someone could help? I am attempting to find the sum of the deflection in a beam, but to do so for the boundary conditions require a total of four formulas in series.

I need to solve the attached equation for I, which is common throughout.

I hope someone can help.

Matt

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2. Oct 4, 2013

CompuChip

Maybe I'm missing something obvious, but the only place I see $I$ is in the denominator of each summand.
So can't you just factor it out?
$$\sum \delta = \frac{1}{24 E I} \left\{ \vphantom{\frac{W_1}{E I}} \cdots \right\}$$

3. Oct 4, 2013

CompuChip,

Thanks for that. I feel a bit thick now. It worked and I got the desired solution.

Matt

4. Oct 4, 2013

CompuChip

No problem, we all make those mistakes.
I was just afraid that you were going to say "Oh, I forgot to mention that the I1,2,3 are the components of I", or "W depends on I" or something nasty like that :)