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Re: Can someone help me in finding the Section Modulus of an I-beam
Re: Can someone help me in finding the Section Modulus of an I-beam -- kin2308	Post Reply	Top of thread	Forum

Posted by: swearingen ® 02/21/2007, 14:07:06 Author Profile eMail author Edit

Probably around 6870in^4, give or take some for any fillets or corner rounding...

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Re: Re: Can someone help me in finding the Section Modulus of an I-beam
Re: Re: Can someone help me in finding the Section Modulus of an I-beam -- swearingen	Post Reply	Top of thread	Forum

Posted by: kin2308 ® 02/21/2007, 14:12:40 Author Profile eMail author Edit

Thanks for your help but I think section modulus has units of in^3 Also, S = I/c I dont think S shud be such a high number. Let me know wht u think. I'm getting around 738in^3 but i'm not sure.

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Re: Re: Re: Can someone help me in finding the Section Modulus of an I-beam
Re: Re: Re: Can someone help me in finding the Section Modulus of an I-beam -- kin2308	Post Reply	Top of thread	Forum

Posted by: swearingen ® 02/23/2007, 10:52:45 Author Profile eMail author Edit

Sorry about that - I listed the I instead of the S and it seems I even did the math on the I incorrectly. To run through my calcs (assumes web height given is distance from inside to inside of flanges): I of 1 flange: =12.125 x 1.5^3 / 12 + 12.125 x 1.5 x ((33.4375 + 1.5)/2)^2 =5553 For web: =.75 x 33.4375^3 / 12 = 2337in^4 Total I = 2 x 5553 + 2337 = 13443in^4 c = (33.4375 + 1.5 + 1.5)/2 = 18.22 I get an S of 738 - it looks like you're right on.

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Re: Re: Re: Re: Can someone help me in finding the Section Modulus of an I-beam
Re: Re: Re: Re: Can someone help me in finding the Section Modulus of an I-beam -- swearingen	Post Reply	Top of thread	Forum

Posted by: stewart ® 02/24/2007, 07:23:31 Author Profile eMail author Edit

Swearingen Looking at the wreckage of the collapsed bridge, you could say "My Bad!" Stewart

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Re: Re: Re: Re: Re: Can someone help me in finding the Section Modulus of an I-beam
Re: Re: Re: Re: Re: Can someone help me in finding the Section Modulus of an I-beam -- stewart	Post Reply	Top of thread	Forum

Posted by: swearingen ® 02/26/2007, 07:55:17 Author Profile eMail author Edit

If he had used my number as a section modulus, the cool thing would be that it wouldn't collapse unless an aircraft carrier decided to cross it... I guess if you're going to make an error, just hope it's in the conservative direction!

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