unexpected hysteretic behavior of shear links

[mehdiharsami]

hello
Iv'e been trying to run an IDA analysis on my steel structure model with EBf bracing, in order to take into account the hysteretic damped energy by shear links. i have assigned a springs (with bl_ kin response curve) at each end of the short beam. but the problem i have is that after i run a time history analysis and check the link hysteretic curves there are several different slopes in the diagram loops,which is wondering to me because in bilinear behavior there are only two stiffness (elastic-plastic behavior).

here's my model
https://ufile.io/ykhi0g5n

and a picture of the link hysteretic curve
https://ufile.io/3udsr9vy

best regards

[seismosoft]

The time step that you are using 0.07 sec is very large. A better value would be 0.01sec or at the most 0.02sec.
Seismosoft Support

[mehdiharsami]

thanks a lot