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Hello everyone, I am trying to model a 'prestressed damper' (RAP) damper which is in the form. Fdamp = F0 + K(x) + CV**a. That means that the damper will start its cycles after reaching the force F0. Is there a way to do model this damper a OPENSEES? I thought about using an initial stress material ...

Hello again , Thank you Dr McKenna for your reply, of course there is no shear force during the uplift i understand that. Moreover i read the manual of the Opensees which concerns the FPS and it also writes about numerical damping. I used a numerical damping like this but still i face the same probl...

Hello everyone, I am testing the behaviour of an FPS (single friction pendulum system) and i want to see what happens in case of an uplift. When i don't have an uplift my model works perfectly and i obtein the results that i expect. However when i increase the scale factor of my seismic excitation i...

Hello everyone, I tried to use the leadrubber X command with my 2.4.5 version and when i try to activate the tags it doesn't work. I saw a topic concerning this subject and Mr Kumar suggested that we should download the latest version. I think that 2.4.5 is the latest version isn't it ? If i don't u...

Hello Frank, I am really glad about your answer. Thanks a lot. I have to compare a program that uses a viscous material with very small alpha with an elastic material that represents the rigidy of my bearing for the LRB. Otherwise i would have already used an elastoplastic material or the lead rubbe...

Hello everyone, I have read numerous posts about having a viscous material in parallel with an elastic material and still i have not understood if we can use it. I have tried to use it with a zerolength element and a newton algorithm and i have a problem in my dynamic analysis. I want to use a visco...

Hello everyone, Has anybody used the iso2spring in Opensees ? I want to calculate the periods of my structure and i read that i have to do firstly a static analysis. I have done it and the vertical period is correct but i apply only a vertical load. How is the first period (horizontal) is calcultate...

Dear all users, I am new to the Opensees so i would really need some help in order to start working in a better way. I want to represent a rigid body isolated in different bearings. In order to begin with i have used a zero length link with an element of elastic behaviour. I have placed a mass in th...