How to calculate "Frame Element Curvatures"

[langxuzeng]

Hi,
Does anybody konw how to calculate the curvature of the frame element based force in SeismoStruct?
Please help me.
Thank you in advance.
Best regards,
Xu-lang,Tseng

[seismosoft]

Dear Xu-lang,

We are not sure we understand what a "frame element curvature" is, since curvatures are typically a section response parameter, rather than an element one.

In any case, if you search this Forum for the word "curvature" you will readily find a myriad of discussions on the subject.

Seismosoft Support

[langxuzeng]

Dear seismosoft support,
Thank you for your suggestion.I have tried it but the desiered resuts that I want have not been found until now.In fact,I want to know how to calculate the section curvature in the SeismoStruct program.When the coordinates of integral points are specified in the Analysis Output module by the users,how does SeismoStruct calculate and output the section curvature of the corresponding integral sections using those above-mentioned coordinates of integral points? In short,I want to konw the the computational principles of section curvature in SeismoStruct.Please explain them for me.
Thank you for your time again.
Kind regards,
Xu-lang

[Stelios_Antoniou]

Langxueng, you can refer to the Material Inelasticity topic of the help system for more details. Further, you can get the curvature from the output in the Stresses and Strains Output.

[TUC]

I would just like to add a notice to the above.
As concerns what langxuzeng said: "When the coordinates of integral points are specified in the Analysis Output module by the users..." the monitoring points/sections are by default the already defined IP's of the element, there are not defined seperately by the user (as far as i know..).
As concerns what was mentioned by seismosoft (-support): "We are not sure we understand what "frame element curvature" is, since curvatures are typically a section responce parameter rather that an element one", i would like to add that this term ("frame element curvature") is the same as it is used in the program in the Stresses and Strains Output, so i am not sure what you don't understand.. In my opinion this term causes misunderstandings because as you said "curvatures are typically a section responce parameter rather that an element one". Besides, in a related post with the title: "how can i get the moment curvature for a section?" the user Salar said something that was not explicity denied so it may cause some doupts..

[seismosoft]

Dear TUC,

Thank you for your contribution to this discussion, to which we respond as follows:

- indeed, as you note, section integration points cannot be specified by users in the Analysis Output module. In the latter, what one can do is to specify the location of fictional stress/strain points, for user monitoring purposes (this matter is further discussed in http://www.seismosoft.com/forum/topic.asp?TOPIC_ID=1099)

- in the output module of SeismoStruct we use the expression "Frame Element Curvatures", rather than "Frame Element Curvature", referring explicitly to the curvatures in each section of the element. We do feel that the use of plural and the explicit indication of the different sections of the element renders it all unambiguous and confusion-proof.

- the post from user Salar that we could find (http://www.seismosoft.com/forum/topic.asp?TOPIC_ID=1031) referred to explicit Moment-Curvature output, which, indeed, SeismoStruct does not currently provide, hence we did not feel the need to respond/contradict it. (but perhaps you are referring to another post?)

Thanks again,

Seismosoft Support

[TUC]

Thank you for your responce seismosoft.

-I accept that the ending "s" in the phrase "Frame Element Curvatures" is enough to clear out the real meaning of it.., i didn't notice that (maybe because your reply to Xu-lang wasn't focused on that point).

-The post in which the user salar mentioned about section curvatures is the following:http://www.seismosoft.com/forum/topic.a ... ,curvature

Thank you