- A) sum Ad2=35.25 in4
- " " = 36.75 "
- C) " " = 54 "
- D) " " = 90.37 "

If I'm doing something wrong I would appreciate your help.

Thanks in advance.

3 replies to this topic

Posted 08 October 2011 - 10:11 PM

I would like to have some help to undestand this concept. Below I wrote the sum of Ad2 for each section, I want to check if I did the calcs well.

If I'm doing something wrong I would appreciate your help.

Thanks in advance.

- A) sum Ad2=35.25 in4
- " " = 36.75 "
- C) " " = 54 "
- D) " " = 90.37 "

If I'm doing something wrong I would appreciate your help.

Thanks in advance.

Posted 12 October 2011 - 03:46 AM

My understanding of this question is that the section with the highest I provides the greatest flexural rigidity (EI). I don`t have my calc close by but when I did it, I calc the I about x-x (E is the same for all) and also got (D) as the highest.

Besides, I`m not a structural babe :-)

Besides, I`m not a structural babe :-)

Posted 14 October 2011 - 02:25 AM

My understanding of this question is that the section with the highest I provides the greatest flexural rigidity (EI). I don`t have my calc close by but when I did it, I calc the I about x-x (E is the same for all) and also got (D) as the highest.

Besides, I`m not a structural babe :-)

Well, could you provide your cals for each section, or any structural that want to help me?

Thanks

Posted 14 October 2011 - 10:53 AM

I don't have the NCEES sample exam you are talking about, but it sounds to me that you are calculating the moment of inertia for various sections based on the parallel axis theorem. If you have the CERM (and you should!), page 42-4 has a section about this theorem. In terms of why the correct answer is the highest value, **with all other things being equal**, the section with the highest moment of inertia will always be the strongest section.

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