The OpenSees Community

Hello, all. I'm an undergraduate research assistant at my university and am using OpenSees to model the SAC LA Office models (post-Northridge). I have read a few publications that use the 3-story model and all provide a fundamental period of around 1.01 - 1.1 seconds. When I run my code, my model sh...

Everybody,

I have talked to Dr. Lignos and got confirmation that these lamda values are the reference cumulative plastic rotation value of the section. I do not require any further assistance but figured I would post this here for those who may have similar questions.

Hi all, I am trying to use the IMK deterioration model in the research that I am doing and was wondering if anybody could give me some tips on defining the cyclic deterioration parameters. I have reviewed related literature and it seems that they need to be experimentally found. Is there a general e...

nparsaeifard, I compared your code to mine and they look similar. I am not an expert at using OpenSees though. Based on my limited knowledge, I think it looks correct except I think the recorders need to be modified. However, I would seek another confirmation from somebody that has better credential...

f.ribeiro wrote: > With the code above I'm afraid you're not reaching the yield moment. Thus > you are obtaining a linear elastic response and not the desired hysteretic > curve. By symply increasing the "ratio" variable you would fix > that. However, I am not sure what's the purpose of th...

Hi all. I'm an undergrad student at UConn using OpenSees in research that I am doing. Ieventually want to model a 9-story frame using zero-length members and modified IMK bilin material and doing a series of analyses on the structure. To understand how zero-length elements work, I wrote code that de...