The OpenSees Community

yuanzhenwei wrote: > Have you solve your problem？I am a beginner in opensees，I met the same > problem with you. I need to model a single degree of freedom structure for > doing IDA analysis,but now I haven't solve the problem , Whether can you > give me the code ? We can communicate with each other ...

Dear all, how can we know exactly what is the usage of this parameters in hyseretic material command : $pinchx pinching factor for strain (or deformation) during reloading $pinchy pinching factor for stress (or force) during reloading $damage1 damage due to ductility: D1(mu-1) $damage2 damage due to...

Dear fmk,
Thank you for your help
best regards,
gahremani

Dear all How can I create a nonlinear SDOF model for using in nonlinear response history analysis? and which parameters should I have to create this model? I'll be very grateful for any instruction or script that could help. P.S : my model has viscous damping and it need to be applied in modeling to...

you can use it for both option's.

Dear fmk I don't know how to thank you for your help. that worked . what was that extra 1 at the end of test command for? I used your command like this and it worked. however it took more time than further analysis: #-----------------------------------------------------------------------------------...

Dear fmk I've tried your method but I could not see any differences between old and new model's response , Here is the scripts I used before and the scripts that I used according your instruction , please contact me If you find anything that can help me with this: ____________________________ Old sc...

Dear all I am performing nonlinear static analysis on three steel structure with 3 ,6 and 12 stories that their plastic behavior modeled with concentrated plastic hinges just as done in the example represented for a 2 story steel frame in wiki opensees site. for each structure at specified displacem...

Thank you so much.

my model is constructed of elastic elements with localized plastisity at both end using zerolength elements." I am running opensses on my steel structure to perform a pushover analysis but the analysis fails and none of my recorders works correctly and I have no output after running the model. ...

I appreciate your help.
could you give me the name of referred paper "Lignos and Krawinkler (2011)" ?

thanks a lot.

In defining bilin material there are four parameters known as cyclic deterioration parameters (Lamda_S,Lamda_C,Lamda_A,Lamda_K) that I don't know the correct values that must be assigned to them. I studied the corresponding references , but there is only one Lamda parameter that is around 1 accordin...

thank you.
so we cannot download it anymore?

in this command is the number of points arbitary or we need to define a specific number of points to form the envelop? and if we need to define the negative part of the envelop we must enter that points ditinctly or defining the positive part of the envelop is enough ? I am very grateful for your at...