Moment capacity of HP12x53

[HanStrulo]

Hi Everybody,

I have a really simple question but for some reason i am doubting myself.

what is the moment capacity (allowable moment) for HP12x53 with a length of 5m (continuously supported)?

I am asking because in CISC, it's not even class 3 and i end up removing some flange width to get it to class 3 and then only use the Sx value to get the elastic moment. Am i missing something? Could we ever use the Zx with this section?

Does the AISC have a similar issue with the HP sections?

Thank you,

 

[phamENG]

Never designed to CISC, and I have no clue what the classes of shapes are or what they mean.

Designing by AISC, an HP12x53 is slender in compression and has non-compact flanges for flexure - so you have to check for LTB and Compression Flange Local Buckling in addition to Yielding.

 

[HanStrulo]

sorry for the confusion. I would like to just know the number you get (allowable moment) to compare against mine. I understand HP are not good in bending but all the reductions we make seem very limiting.

can it be designed using plastic moment or only elastic moment?

Thanks alot,

 

[dik]

Check... You can fiddle with the flange widths

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1642698391/tips/Prop-W_BU_rg8n9a.pdf[/url]

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/raw/upload/v1642698392/tips/Prop-W_BU_jilg3j.sm[/url]

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[dik]

as a Class 4 section, only elastic.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[HanStrulo]

@dik. Thank you. i get a similar number too. I only wanted to check because i did not want to be overdesigning it.