Seismosoft | Earthquake Engineering Solutions

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The value of Eh used for modal analysis, or any linear analysis, depends upon whether the linear load case starts from zero initial conditions or uses the stiffness from a previous nonlinear case. From zero, the initial elastic stiffness of each fiber is used. If the fiber has different initial tens...

Below is a detailed description of how the program determines the flexibility of the element with hinge: The issue here is that the flexibility of the fiber hinge is added to the elastic flexibility of the frame member containing the hinge. It may be better viewed as the modulus of elasticity being ...

Taken from: https://wiki.csiamerica.com/display /kb/Elastic+softening+due+to+fiber+hinges+in+older+versions+of+SAP2000%2C+CSiBridge%2C+and+ETABS Is it possible to implement fiber hinges without introducing softening? Extended Question : Fiber hinges seem to introduce artificial flexibility to the mo...

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To the best of my knowledge, the length of the plastic hinge is only defined to link the curvature to the rotation, and the free vibrations are calculated with the elastic proriety ? In this case, it would not be possible to calibrate the length of the plastic hinge (the extent of inelasticity), to ...

Hello,
I just noticed that in a model with infrmFBPH elements, the free vibration results depend on the length of the plastic hinge?
I'm intrigued !!!!!
can there be an explanation ?

I've noticed that the free vibration results for FBPH depend on the length of the plastic hinge !!!

This was my understanding. In these cases, the elastic frame element with hinges requires a deeper knowledge of advanced nonlinear modeling, and the characterization of the inelastic cross-section parameters needs special attention and time investment during the modeling process. The infrmDBPH eleme...

Hello,
I would like to know what the difference is between these two elements :
- Inelastic displacement-based plastic hinge frame element type - infrmDBPH
and
- Elastic frame element with hinges - elfrmH
sincerely