how can i get the moment curvature for a section?

[maryam]

hi everybody
I don't know whether for getting the moment curvature of a column section (with constant axial force)I should run processor or not? how can I get the moment curvature curve?
I jus need the moment curvature of the critical section as output.
thank you

[seismosoft]

Maryam,

Have you searched this Forum for "moment-curvature" already?

Seismosoft Support

[abazvand]

hello;
you can find your answer after the analysis finishes but it depends on kind of element class and the way that you have modeled it,anyway in post processor tab-global response- frame hysteretic section select the column...
from your homeland

[ricardomonteiro]

Hi Maryam,

Whenever I wanted to get the moment-curvature response of a section using SeismoStruct I simply used a very short vertical element (let us say 0.5m), with the desired cross section, with a pair of forces on top (a horizontal incremental one, which will assure the necessary bending moment to the element/cross section, and a vertical one, equal to the axial loading).

Then, you just need to carry out a pushover analysis of this simple structure and get the results from the post-processor (moment and curvature) for the desired section.

Hope it does the trick! Let me know if you need help.

Cheers.

[salar]

hi abazand
in the case that you addressed is not correct.it just gives like Moment-rotation, and for curvature of section this program can't be account.seismostruct just gives curvature of element in different "integration section" in stress and strain output->frame element curvature.

[Muntasir]

Hi Ricardo,

I followed your instruction for finding the moment-curvature relation. If I used forced based element with 5 integration sections then it gives five different curvature values. Do I need to add them up to get the total curvature? Please advise.

Thanks

[ricardomonteiro]

Hi Muntasir,

Given that you are looking for the Moment-Curvature relationship for the cross section, and you will be using the bending moment at the restrained end-node of the element, you should also use the curvature of the integration point (IP) that corresponds to the same end-node (it will be IP number 1 or 5) without adding them up.

Best,
Ricardo

[Muntasir]

Hi Ricardo,

Thanks a lot.