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I have noticed that the properties assigned to steel fiber elements in the examples are all the same. For steel material, Hardening Material with post elastic ratio of 1/30 has been used.
I wonder if it is based on previous research or just an assumption?
Thanks

I have modeled a steel frame with fiber elements. I need to find the plastic hinges length. I think the only way is to get the stress at both ends of the fiber and do some math calculations based on the distribution function. I appreciate if someone could help me with the theory, introducing referen...

fmk wrote: > there is the undocumented -dT deltaT option you could try .. it records at the first > time step t = t1, the next time the domain time t2 is >= t1+deltaT, and so on. It doesn't work for all recorders. I couldn't use it myself resulted in huge size output files. It doesn't matter if you ...

IsmBaha wrote: > Integration point weight wIP defines the integration length of each integration > point, as LIP = wIP*Lcol > where LIP integration point length, Lcol is the height of the column element. > > For example, as I remember for NIP=5 with gauss-lobatto, 1st integration point weight > was ...

silvia wrote: > the number of integration points goes along with the integration scheme. > if you use too few integration points you don't have a realistic > distribution of deformations. typically 4-5 integrations points give good > results. > if you have a strengthening system. if your system is s...

fmk wrote: > there is only rayleigh damping or explicit damping through viscous > materials. > > the rayleigh coefficients are typically chosen > for 2 specific modes and desired damping ratio. typically user selects > damping ratio at start of analysis. however, as mode shapes change in > nonlinear...

Hi, I ran time history analyses with the newest version of Opensees. The output file has a problem. I wanted the forces of one of the columns in the structure. Some of the output lines are splitted into two lines; even a force value could be put in two different lines. The problems of this nature I ...

Hello, In SAP2000, softening of the frames modeled with fiber hinges occurs due to calculation of the fiber-hinge response curve, "which proceeds directly from the axial response of individual section fibers. During linear response, fiber elasticity is added to element elasticity, causing softening"...

Hello buddhasarah,

Did you solve the problem? I was wondering if you would please send me the files? If it is not OK yet we can work on them together to find the solution. I am PhD student and need the models for my research.
Thank you so much in advance.

Hi jwieser

Could you please send me your files? I need the SAC building models for my further analyses...
Thank you so much.