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Any possibility of frank looking at this? I really need it to work asap.

Thanks for your answer. But what a need is to use two different materials for the core. I need to separate the boundary part of the core of a big T section (wall's head) from the center, where the confinement is important for a long web.

Hi Emrah, How did you manage to calculate damping forces? In you recent paper, it seems that you have calculated the total damping forces by subtracting the first story shear forces from the total joint reactions? But when I try to do the similar thing for one of my columns, I get the column shear f...

Hi...
the difference of the periods should be very small, i think it is normal.