<p style=”text-align: left;”>hello to all. I’m trying to model a 2D RC frame against cyclic reversible actions considering joint flexibility in which the Beamcolumnjoint element in opensees is better element to simulate the failure modes of the joint. my problem is that the uni axial material models for the bar slip failure mode and the shear panel are clearly defined in opensees.i.e.the Bondsp and the Pinching 4 material models respectively.but, the uni-axial constitutive model for interface shear failure mode at the beam and column interfaces is not clearly defined.I used the hysteritic material model I found it difficult to get results.So if you guys know the material model for interface shear spring please help me fix this problem.</p>
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