Hi Bimal

Just tabulate the time-displacement data in amplitude option and then assign that in boundary condition as a displacement control.

Thank you very much Khaled.

I am referring to ATC 24 loading protocol for cyclic loading.How do we predict the yield displacement for the recommended loading history?

 Hi, Bimal, 

I believe the key issue of determining the protocol is to obtain the yield displacement first.

Here is the procedure we have adopted in a previous research work.

1.      Conduct the coupon test to obtain the yield strength of the material.

2.      Assign the material property to the numerical model of the specimen and perform a monotonic analysis

3.      Evaluate the results and determine the yield displacement.

4.      Tabulate the protocol into the model and run a quasi-static analysis.

If you just try a numerical work, you might use the nominal yield strength of the material.

It should be noted that the essence of cyclic analysis is a simplified way to capture the seismic performance of the connection but it is not intended for completely quantify the behavior of the connection under earthquakes. I believe the loading protocol documented in the provisions can be modified if you have the rational motive. 

Thank you Ke Ke for your kind reply.

I assigned the loading protocol to get the cyclic behavior but I couldnot get the reponse as expected.

Is it just to input the load in the amplitude option or there is some thing else I have to go for to get the hysteresis curve??