singleFPBearing kInit value

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singleFPBearing kInit value

Post by hgp » Mon Jun 01, 2020 8:25 am

Hi OpenSees community,

I'm curious if it's possible to specify the initial stiffness "kInit" of the singleFPBearing as F_y/u_y rather than the current mu/u_y.

I currently have kInit as defined via the wiki page: mu/u_y. However, I am running into strange results where bearings that take double the load (i.e. inner columns) have half as much initial stiffness as the outer columns. Plotting the hysteresis loop below, I would expect for all loops to have the same stiffness. But as you can see, some loops have inconsistent initial slopes. ... sp=sharing

Could this be another issue than kInit? My loads are currently defined as a distributed line load onto the frame here: ... me_Example, except isolated.

Thanks for your help in advance.

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