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Thank you very much for your reply!

But I do not know how to get in touch with the developer, can you please further answer?

Using a multi-dimensional concrete model, it seems that only the ' nDmaterial PlaneStressUserMaterial ' created by the developer can be used.

I model the steel frame-shear wall structure. The steel frame adopts steel02, dispBeamColumn element. The shear wall is simulated by the layered shell element developed by Lu.

Hello everyone! I have been working on the mainshock-aftershock sequence recently. Due to the large model, IDA analysis is time-consuming. I consider using the 'database' command to save the model after completing the mainshock analysis. However, there are some problems in restoring the model before...