The OpenSees Community

start with these uniaxial models:
http://opensees.berkeley.edu/community/ ... =2&t=35378

Bests

Dear All, Please review these papers regarding the damping in the nonlinear analysis of structures in addition to what Vesna introduced before: - Petrini, Lorenza , Maggi, Claudio , Priestley, M. J. Nigel and Calvi, G. Michele(2008) 'Experimental Verification of Viscous Damping Modeling for Inelasti...

I am not sure that it is possible to build a zerolength fiber model with this material. If you go to the developer website, you can find their OpenSees file. As far as I know, they all are made with displacement-base elements not force-base. Please check their website. https://pantherfile.uwm.edu/jz...

The tricky way is to do moment-curvature analysis with the bond_SP01 that you won't get any error. Then, use Hysteretic material to linearize the curve and make the moment-rotation envelop. Note that for numerical calculation the length of zerolength element is unit not zero. Therefore the rotation ...

Please read developer's website: https://pantherfile.uwm.edu/jzhao/www/Bond_SP01_pages/Bond_FAQs.html How to define a Bond_SP01 uniaxial material model? go toTop Q: how can I calculate la? I used Eq.2 in the ACI paper to find la,min and I got 95 mm. A: you currently need six parameters (Fy, Sy, Fu, ...

These are the studies that worked on Residual Displacements with OpenSEES and could match the simulated displacement history with the test data. [1] Jeong, HIL., Sakai, J., Mahin, SA. (2008). Shaking Table Tests and Numerical Investigation of Self-Centering Reinforced Concrete Bridge Columns. PEER-2...

There are several examples that you can start with. The link will direct you to one of those:
http://opensees.berkeley.edu/wiki/index ... r_Analysis

See this post:
http://opensees.berkeley.edu/community/ ... =2&t=35378

Regarding your first question, you can't use one BWH element for a member with the plastic hinge at the middle since this element has plastic hinges at the ends and the middle portion is linear elastic. You may split your member in two and use two BWH elements to construct your member. Alternatively...

As you mentioned, we don't want to have different initial stiffness for linear and nonlinear analyses. Please make sure that for the Concrete01 you used, both f'c and strain at maximum stress (epsc0) have been increased by the same scale factor since the modulus of elasticity is 2*$fpc/$epsc0 (see h...

The method I want you to try is not really necessary but in your case that you are not sure about your linear/nonlinear analysis, that may be help. Do this, for the linear analysis, instead of using Elastic element, use the same nonlinear element which you uses in the fiber model but increase the co...

I had hard time to obtain cyclic stress-strain curve of Concrete01 and Concrete02 by cyclic analysis of a zerolength material with only one concrete fiber. However, I couldn't get the curve after f'c. If you don't need the cyclic curve and you're fine with the backbone curve, simply use the equation...

Hi,
I don't know what the restoring force model is. You have a model for you frame structure in OpenSees and you can get any response you want including forces. I can't get your question.

I have tried both 32 and 64. I think the problem is what I mentioned before, AMD processors. I had to change my CPU to Intel and it's working now.

if you don't like the changes that Vesna has done for you, there is also a tricky way. Instead of ElasticPP you can use Steel01 with small strain-hardening ratio.
http://opensees.berkeley.edu/wiki/index ... 1_Material